Diff: mbed/platform/Callback.h

Revision:

12:406f75196a12

Parent:

11:32eeb052cda5

Child:

13:0c732e06d675

--- a/mbed/platform/Callback.h	Wed Aug 26 14:26:27 2020 +0530
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,4939 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2015 ARM Limited
- * SPDX-License-Identifier: Apache-2.0
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#ifndef MBED_CALLBACK_H
-#define MBED_CALLBACK_H
-
-#include <string.h>
-#include <stdint.h>
-#include <new>
-#include "platform/mbed_assert.h"
-#include "platform/mbed_toolchain.h"
-
-namespace mbed {
-/** \addtogroup platform */
-/** @{*/
-/**
- * \defgroup platform_Callback Callback class
- * @{
- */
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename F>
-class Callback;
-
-// Internal sfinae declarations
-//
-// These are used to eliminate overloads based on type attributes
-// 1. Does a function object have a call operator
-// 2. Does a function object fit in the available storage
-//
-// These eliminations are handled cleanly by the compiler and avoid
-// massive and misleading error messages when confronted with an
-// invalid type (or worse, runtime failures)
-namespace detail {
-struct nil {};
-
-template <bool B, typename R = nil>
-struct enable_if {
-    typedef R type;
-};
-
-template <typename R>
-struct enable_if<false, R> {};
-
-template <typename M, M>
-struct is_type {
-    static const bool value = true;
-};
-}
-
-#define MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, M)                            \
-    typename detail::enable_if<                                             \
-            detail::is_type<M, &F::operator()>::value &&                    \
-            sizeof(F) <= sizeof(uintptr_t)                                  \
-        >::type = detail::nil()
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R>
-class Callback<R()> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)() = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R()> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)())
-    {
-        generate(method_context<T, R(T::*)()>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)() const)
-    {
-        generate(method_context<const T, R(T::*)() const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)() volatile)
-    {
-        generate(method_context<volatile T, R(T::*)() volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)() const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)() const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *), U *arg)
-    {
-        generate(function_context<R(*)(T *), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *), const U *arg)
-    {
-        generate(function_context<R(*)(const T *), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)()))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)())
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R()> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)())
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)() const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)() volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)() const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f     Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)()))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f     Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)() const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call() const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this);
-    }
-
-    /** Call the attached function
-     */
-    R operator()() const
-    {
-        return call();
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func)
-    {
-        return static_cast<Callback *>(func)->call();
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)();
-        void (*_boundfunc)(_class *);
-        void (_class::*_methodfunc)();
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p)
-    {
-        return (*(F *)p)();
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()() const
-        {
-            return (obj->*method)();
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()() const
-        {
-            return func(arg);
-        }
-    };
-};
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R, typename A0>
-class Callback<R(A0)> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)(A0) = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R(A0)> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)(A0))
-    {
-        generate(method_context<T, R(T::*)(A0)>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)(A0) const)
-    {
-        generate(method_context<const T, R(T::*)(A0) const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)(A0) volatile)
-    {
-        generate(method_context<volatile T, R(T::*)(A0) volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)(A0) const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)(A0) const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *, A0), U *arg)
-    {
-        generate(function_context<R(*)(T *, A0), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *, A0), const U *arg)
-    {
-        generate(function_context<R(*)(const T *, A0), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *, A0), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *, A0), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *, A0), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *, A0), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0)))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *, A0))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *, A0))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *, A0))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *, A0))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(A0))
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R(A0)> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)(A0))
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)(A0) const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)(A0) volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)(A0) const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *, A0), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *, A0), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *, A0), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *, A0), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0)))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0) const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *, A0))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *, A0))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *, A0))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *, A0))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call(A0 a0) const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this, a0);
-    }
-
-    /** Call the attached function
-     */
-    R operator()(A0 a0) const
-    {
-        return call(a0);
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @param a0 An argument to be called with function func
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func, A0 a0)
-    {
-        return static_cast<Callback *>(func)->call(a0);
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)(A0);
-        void (*_boundfunc)(_class *, A0);
-        void (_class::*_methodfunc)(A0);
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *, A0);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p, A0 a0)
-    {
-        return (*(F *)p)(a0);
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()(A0 a0) const
-        {
-            return (obj->*method)(a0);
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()(A0 a0) const
-        {
-            return func(arg, a0);
-        }
-    };
-};
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R, typename A0, typename A1>
-class Callback<R(A0, A1)> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)(A0, A1) = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R(A0, A1)> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)(A0, A1))
-    {
-        generate(method_context<T, R(T::*)(A0, A1)>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)(A0, A1) const)
-    {
-        generate(method_context<const T, R(T::*)(A0, A1) const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)(A0, A1) volatile)
-    {
-        generate(method_context<volatile T, R(T::*)(A0, A1) volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)(A0, A1) const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)(A0, A1) const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *, A0, A1), U *arg)
-    {
-        generate(function_context<R(*)(T *, A0, A1), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *, A0, A1), const U *arg)
-    {
-        generate(function_context<R(*)(const T *, A0, A1), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *, A0, A1), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *, A0, A1), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *, A0, A1), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *, A0, A1), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1)))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *, A0, A1))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *, A0, A1))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *, A0, A1))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R(A0, A1)> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)(A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)(A0, A1) const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)(A0, A1) volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)(A0, A1) const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *, A0, A1), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *, A0, A1), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *, A0, A1), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *, A0, A1), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1)))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1) const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *, A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *, A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *, A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *, A0, A1))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call(A0 a0, A1 a1) const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this, a0, a1);
-    }
-
-    /** Call the attached function
-     */
-    R operator()(A0 a0, A1 a1) const
-    {
-        return call(a0, a1);
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @param a0 An argument to be called with function func
-     *  @param a1 An argument to be called with function func
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func, A0 a0, A1 a1)
-    {
-        return static_cast<Callback *>(func)->call(a0, a1);
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)(A0, A1);
-        void (*_boundfunc)(_class *, A0, A1);
-        void (_class::*_methodfunc)(A0, A1);
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *, A0, A1);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p, A0 a0, A1 a1)
-    {
-        return (*(F *)p)(a0, a1);
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()(A0 a0, A1 a1) const
-        {
-            return (obj->*method)(a0, a1);
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()(A0 a0, A1 a1) const
-        {
-            return func(arg, a0, a1);
-        }
-    };
-};
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R, typename A0, typename A1, typename A2>
-class Callback<R(A0, A1, A2)> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)(A0, A1, A2) = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R(A0, A1, A2)> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)(A0, A1, A2))
-    {
-        generate(method_context<T, R(T::*)(A0, A1, A2)>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)(A0, A1, A2) const)
-    {
-        generate(method_context<const T, R(T::*)(A0, A1, A2) const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)(A0, A1, A2) volatile)
-    {
-        generate(method_context<volatile T, R(T::*)(A0, A1, A2) volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)(A0, A1, A2) const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)(A0, A1, A2) const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *, A0, A1, A2), U *arg)
-    {
-        generate(function_context<R(*)(T *, A0, A1, A2), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *, A0, A1, A2), const U *arg)
-    {
-        generate(function_context<R(*)(const T *, A0, A1, A2), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *, A0, A1, A2), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *, A0, A1, A2), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *, A0, A1, A2), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *, A0, A1, A2), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2)))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *, A0, A1, A2))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *, A0, A1, A2))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R(A0, A1, A2)> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)(A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)(A0, A1, A2) const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)(A0, A1, A2) volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)(A0, A1, A2) const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *, A0, A1, A2), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *, A0, A1, A2), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *, A0, A1, A2), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *, A0, A1, A2), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2)))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2) const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *, A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *, A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *, A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call(A0 a0, A1 a1, A2 a2) const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this, a0, a1, a2);
-    }
-
-    /** Call the attached function
-     */
-    R operator()(A0 a0, A1 a1, A2 a2) const
-    {
-        return call(a0, a1, a2);
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @param a0 An argument to be called with function func
-     *  @param a1 An argument to be called with function func
-     *  @param a2 An argument to be called with function func
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func, A0 a0, A1 a1, A2 a2)
-    {
-        return static_cast<Callback *>(func)->call(a0, a1, a2);
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)(A0, A1, A2);
-        void (*_boundfunc)(_class *, A0, A1, A2);
-        void (_class::*_methodfunc)(A0, A1, A2);
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *, A0, A1, A2);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p, A0 a0, A1 a1, A2 a2)
-    {
-        return (*(F *)p)(a0, a1, a2);
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2) const
-        {
-            return (obj->*method)(a0, a1, a2);
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2) const
-        {
-            return func(arg, a0, a1, a2);
-        }
-    };
-};
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3>
-class Callback<R(A0, A1, A2, A3)> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)(A0, A1, A2, A3) = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R(A0, A1, A2, A3)> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)(A0, A1, A2, A3))
-    {
-        generate(method_context<T, R(T::*)(A0, A1, A2, A3)>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)(A0, A1, A2, A3) const)
-    {
-        generate(method_context<const T, R(T::*)(A0, A1, A2, A3) const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)(A0, A1, A2, A3) volatile)
-    {
-        generate(method_context<volatile T, R(T::*)(A0, A1, A2, A3) volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)(A0, A1, A2, A3) const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)(A0, A1, A2, A3) const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *, A0, A1, A2, A3), U *arg)
-    {
-        generate(function_context<R(*)(T *, A0, A1, A2, A3), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *, A0, A1, A2, A3), const U *arg)
-    {
-        generate(function_context<R(*)(const T *, A0, A1, A2, A3), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *, A0, A1, A2, A3), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *, A0, A1, A2, A3), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *, A0, A1, A2, A3), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *, A0, A1, A2, A3), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3)))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *, A0, A1, A2, A3))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *, A0, A1, A2, A3))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R(A0, A1, A2, A3)> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)(A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)(A0, A1, A2, A3) const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)(A0, A1, A2, A3) volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)(A0, A1, A2, A3) const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *, A0, A1, A2, A3), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *, A0, A1, A2, A3), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *, A0, A1, A2, A3), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *, A0, A1, A2, A3), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3)))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3) const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *, A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *, A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call(A0 a0, A1 a1, A2 a2, A3 a3) const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this, a0, a1, a2, a3);
-    }
-
-    /** Call the attached function
-     */
-    R operator()(A0 a0, A1 a1, A2 a2, A3 a3) const
-    {
-        return call(a0, a1, a2, a3);
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @param a0 An argument to be called with function func
-     *  @param a1 An argument to be called with function func
-     *  @param a2 An argument to be called with function func
-     *  @param a3 An argument to be called with function func
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func, A0 a0, A1 a1, A2 a2, A3 a3)
-    {
-        return static_cast<Callback *>(func)->call(a0, a1, a2, a3);
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)(A0, A1, A2, A3);
-        void (*_boundfunc)(_class *, A0, A1, A2, A3);
-        void (_class::*_methodfunc)(A0, A1, A2, A3);
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *, A0, A1, A2, A3);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p, A0 a0, A1 a1, A2 a2, A3 a3)
-    {
-        return (*(F *)p)(a0, a1, a2, a3);
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2, A3 a3) const
-        {
-            return (obj->*method)(a0, a1, a2, a3);
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2, A3 a3) const
-        {
-            return func(arg, a0, a1, a2, a3);
-        }
-    };
-};
-
-/** Callback class based on template specialization
- *
- * @note Synchronization level: Not protected
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-class Callback<R(A0, A1, A2, A3, A4)> {
-public:
-    /** Create a Callback with a static function
-     *  @param func     Static function to attach
-     */
-    Callback(R(*func)(A0, A1, A2, A3, A4) = 0)
-    {
-        if (!func) {
-            memset(this, 0, sizeof(Callback));
-        } else {
-            generate(func);
-        }
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     */
-    Callback(const Callback<R(A0, A1, A2, A3, A4)> &func)
-    {
-        if (func._ops) {
-            func._ops->move(this, &func);
-        }
-        _ops = func._ops;
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(U *obj, R(T::*method)(A0, A1, A2, A3, A4))
-    {
-        generate(method_context<T, R(T::*)(A0, A1, A2, A3, A4)>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const U *obj, R(T::*method)(A0, A1, A2, A3, A4) const)
-    {
-        generate(method_context<const T, R(T::*)(A0, A1, A2, A3, A4) const>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) volatile)
-    {
-        generate(method_context<volatile T, R(T::*)(A0, A1, A2, A3, A4) volatile>(obj, method));
-    }
-
-    /** Create a Callback with a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     */
-    template<typename T, typename U>
-    Callback(const volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) const volatile)
-    {
-        generate(method_context<const volatile T, R(T::*)(A0, A1, A2, A3, A4) const volatile>(obj, method));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(T *, A0, A1, A2, A3, A4), U *arg)
-    {
-        generate(function_context<R(*)(T *, A0, A1, A2, A3, A4), T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const T *, A0, A1, A2, A3, A4), const U *arg)
-    {
-        generate(function_context<R(*)(const T *, A0, A1, A2, A3, A4), const T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(volatile T *, A0, A1, A2, A3, A4), volatile U *arg)
-    {
-        generate(function_context<R(*)(volatile T *, A0, A1, A2, A3, A4), volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     */
-    template<typename T, typename U>
-    Callback(R(*func)(const volatile T *, A0, A1, A2, A3, A4), const volatile U *arg)
-    {
-        generate(function_context<R(*)(const volatile T *, A0, A1, A2, A3, A4), const volatile T>(func, arg));
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4)))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) const))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     */
-    template <typename F>
-    Callback(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) const volatile))
-    {
-        generate(f);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(U *obj, R(*func)(T *, A0, A1, A2, A3, A4))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const U *obj, R(*func)(const T *, A0, A1, A2, A3, A4))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3, A4))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Create a Callback with a static function and bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to Callback(func, arg)
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to Callback(func, arg)")
-    Callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3, A4))
-    {
-        new (this) Callback(func, obj);
-    }
-
-    /** Destroy a callback
-     */
-    ~Callback()
-    {
-        if (_ops) {
-            _ops->dtor(this);
-        }
-    }
-
-    /** Attach a static function
-     *  @param func     Static function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a Callback
-     *  @param func     The Callback to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const Callback<R(A0, A1, A2, A3, A4)> &func)
-    {
-        this->~Callback();
-        new (this) Callback(func);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(U *obj, R(T::*method)(A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const U *obj, R(T::*method)(A0, A1, A2, A3, A4) const)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a member function
-     *  @param obj      Pointer to object to invoke member function on
-     *  @param method   Member function to attach
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template<typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) const volatile)
-    {
-        this->~Callback();
-        new (this) Callback(obj, method);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(T *, A0, A1, A2, A3, A4), U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const T *, A0, A1, A2, A3, A4), const U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(volatile T *, A0, A1, A2, A3, A4), volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param func     Static function to attach
-     *  @param arg      Pointer argument to function
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(R(*func)(const volatile T *, A0, A1, A2, A3, A4), const volatile U *arg)
-    {
-        this->~Callback();
-        new (this) Callback(func, arg);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4)))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) const))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a function object
-     *  @param f Function object to attach
-     *  @note The function object is limited to a single word of storage
-     *  @deprecated
-     *      Replaced by simple assignment 'Callback cb = func'
-     */
-    template <typename F>
-    MBED_DEPRECATED_SINCE("mbed-os-5.4",
-                          "Replaced by simple assignment 'Callback cb = func")
-    void attach(const volatile F f, MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, R(F::*)(A0, A1, A2, A3, A4) const volatile))
-    {
-        this->~Callback();
-        new (this) Callback(f);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(U *obj, R(*func)(T *, A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const U *obj, R(*func)(const T *, A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Attach a static function with a bound pointer
-     *  @param obj  Pointer to object to bind to function
-     *  @param func Static function to attach
-     *  @deprecated
-     *      Arguments to callback have been reordered to attach(func, arg)
-     */
-    template <typename T, typename U>
-    MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                          "Arguments to callback have been reordered to attach(func, arg)")
-    void attach(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3, A4))
-    {
-        this->~Callback();
-        new (this) Callback(func, obj);
-    }
-
-    /** Assign a callback
-     */
-    Callback &operator=(const Callback &that)
-    {
-        if (this != &that) {
-            this->~Callback();
-            new (this) Callback(that);
-        }
-
-        return *this;
-    }
-
-    /** Call the attached function
-     */
-    R call(A0 a0, A1 a1, A2 a2, A3 a3, A4 a4) const
-    {
-        MBED_ASSERT(_ops);
-        return _ops->call(this, a0, a1, a2, a3, a4);
-    }
-
-    /** Call the attached function
-     */
-    R operator()(A0 a0, A1 a1, A2 a2, A3 a3, A4 a4) const
-    {
-        return call(a0, a1, a2, a3, a4);
-    }
-
-    /** Test if function has been attached
-     */
-    operator bool() const
-    {
-        return _ops;
-    }
-
-    /** Test for equality
-     */
-    friend bool operator==(const Callback &l, const Callback &r)
-    {
-        return memcmp(&l, &r, sizeof(Callback)) == 0;
-    }
-
-    /** Test for inequality
-     */
-    friend bool operator!=(const Callback &l, const Callback &r)
-    {
-        return !(l == r);
-    }
-
-    /** Static thunk for passing as C-style function
-     *  @param func Callback to call passed as void pointer
-     *  @param a0 An argument to be called with function func
-     *  @param a1 An argument to be called with function func
-     *  @param a2 An argument to be called with function func
-     *  @param a3 An argument to be called with function func
-     *  @param a4 An argument to be called with function func
-     *  @return the value as determined by func which is of
-     *      type and determined by the signature of func
-     */
-    static R thunk(void *func, A0 a0, A1 a1, A2 a2, A3 a3, A4 a4)
-    {
-        return static_cast<Callback *>(func)->call(a0, a1, a2, a3, a4);
-    }
-
-private:
-    // Stored as pointer to function and pointer to optional object
-    // Function pointer is stored as union of possible function types
-    // to guarantee proper size and alignment
-    struct _class;
-    union {
-        void (*_staticfunc)(A0, A1, A2, A3, A4);
-        void (*_boundfunc)(_class *, A0, A1, A2, A3, A4);
-        void (_class::*_methodfunc)(A0, A1, A2, A3, A4);
-    } _func;
-    void *_obj;
-
-    // Dynamically dispatched operations
-    const struct ops {
-        R(*call)(const void *, A0, A1, A2, A3, A4);
-        void (*move)(void *, const void *);
-        void (*dtor)(void *);
-    } *_ops;
-
-    // Generate operations for function object
-    template <typename F>
-    void generate(const F &f)
-    {
-        static const ops ops = {
-            &Callback::function_call<F>,
-            &Callback::function_move<F>,
-            &Callback::function_dtor<F>,
-        };
-
-        MBED_STATIC_ASSERT(sizeof(Callback) - sizeof(_ops) >= sizeof(F),
-                           "Type F must not exceed the size of the Callback class");
-        memset(this, 0, sizeof(Callback));
-        new (this) F(f);
-        _ops = &ops;
-    }
-
-    // Function attributes
-    template <typename F>
-    static R function_call(const void *p, A0 a0, A1 a1, A2 a2, A3 a3, A4 a4)
-    {
-        return (*(F *)p)(a0, a1, a2, a3, a4);
-    }
-
-    template <typename F>
-    static void function_move(void *d, const void *p)
-    {
-        new (d) F(*(F *)p);
-    }
-
-    template <typename F>
-    static void function_dtor(void *p)
-    {
-        ((F *)p)->~F();
-    }
-
-    // Wrappers for functions with context
-    template <typename O, typename M>
-    struct method_context {
-        M method;
-        O *obj;
-
-        method_context(O *obj, M method)
-            : method(method), obj(obj) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2, A3 a3, A4 a4) const
-        {
-            return (obj->*method)(a0, a1, a2, a3, a4);
-        }
-    };
-
-    template <typename F, typename A>
-    struct function_context {
-        F func;
-        A *arg;
-
-        function_context(F func, A *arg)
-            : func(func), arg(arg) {}
-
-        R operator()(A0 a0, A1 a1, A2 a2, A3 a3, A4 a4) const
-        {
-            return func(arg, a0, a1, a2, a3, a4);
-        }
-    };
-};
-
-// Internally used event type
-typedef Callback<void(int)> event_callback_t;
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R>
-Callback<R()> callback(R(*func)() = 0)
-{
-    return Callback<R()>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R>
-Callback<R()> callback(const Callback<R()> &func)
-{
-    return Callback<R()>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R>
-Callback<R()> callback(U *obj, R(T::*method)())
-{
-    return Callback<R()>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R>
-Callback<R()> callback(const U *obj, R(T::*method)() const)
-{
-    return Callback<R()>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R>
-Callback<R()> callback(volatile U *obj, R(T::*method)() volatile)
-{
-    return Callback<R()>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R>
-Callback<R()> callback(const volatile U *obj, R(T::*method)() const volatile)
-{
-    return Callback<R()>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R>
-Callback<R()> callback(R(*func)(T *), U *arg)
-{
-    return Callback<R()>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R>
-Callback<R()> callback(R(*func)(const T *), const U *arg)
-{
-    return Callback<R()>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R>
-Callback<R()> callback(R(*func)(volatile T *), volatile U *arg)
-{
-    return Callback<R()>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R>
-Callback<R()> callback(R(*func)(const volatile T *), const volatile U *arg)
-{
-    return Callback<R()>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R()> callback(U *obj, R(*func)(T *))
-{
-    return Callback<R()>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R()> callback(const U *obj, R(*func)(const T *))
-{
-    return Callback<R()>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R()> callback(volatile U *obj, R(*func)(volatile T *))
-{
-    return Callback<R()>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R()> callback(const volatile U *obj, R(*func)(const volatile T *))
-{
-    return Callback<R()>(func, obj);
-}
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0>
-Callback<R(A0)> callback(R(*func)(A0) = 0)
-{
-    return Callback<R(A0)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0>
-Callback<R(A0)> callback(const Callback<R(A0)> &func)
-{
-    return Callback<R(A0)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(U *obj, R(T::*method)(A0))
-{
-    return Callback<R(A0)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(const U *obj, R(T::*method)(A0) const)
-{
-    return Callback<R(A0)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(volatile U *obj, R(T::*method)(A0) volatile)
-{
-    return Callback<R(A0)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(const volatile U *obj, R(T::*method)(A0) const volatile)
-{
-    return Callback<R(A0)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(R(*func)(T *, A0), U *arg)
-{
-    return Callback<R(A0)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(R(*func)(const T *, A0), const U *arg)
-{
-    return Callback<R(A0)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(R(*func)(volatile T *, A0), volatile U *arg)
-{
-    return Callback<R(A0)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0>
-Callback<R(A0)> callback(R(*func)(const volatile T *, A0), const volatile U *arg)
-{
-    return Callback<R(A0)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0)> callback(U *obj, R(*func)(T *, A0))
-{
-    return Callback<R(A0)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0)> callback(const U *obj, R(*func)(const T *, A0))
-{
-    return Callback<R(A0)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0)> callback(volatile U *obj, R(*func)(volatile T *, A0))
-{
-    return Callback<R(A0)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0)> callback(const volatile U *obj, R(*func)(const volatile T *, A0))
-{
-    return Callback<R(A0)>(func, obj);
-}
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(R(*func)(A0, A1) = 0)
-{
-    return Callback<R(A0, A1)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(const Callback<R(A0, A1)> &func)
-{
-    return Callback<R(A0, A1)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(U *obj, R(T::*method)(A0, A1))
-{
-    return Callback<R(A0, A1)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(const U *obj, R(T::*method)(A0, A1) const)
-{
-    return Callback<R(A0, A1)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(volatile U *obj, R(T::*method)(A0, A1) volatile)
-{
-    return Callback<R(A0, A1)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(const volatile U *obj, R(T::*method)(A0, A1) const volatile)
-{
-    return Callback<R(A0, A1)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(R(*func)(T *, A0, A1), U *arg)
-{
-    return Callback<R(A0, A1)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(R(*func)(const T *, A0, A1), const U *arg)
-{
-    return Callback<R(A0, A1)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(R(*func)(volatile T *, A0, A1), volatile U *arg)
-{
-    return Callback<R(A0, A1)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-Callback<R(A0, A1)> callback(R(*func)(const volatile T *, A0, A1), const volatile U *arg)
-{
-    return Callback<R(A0, A1)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1)> callback(U *obj, R(*func)(T *, A0, A1))
-{
-    return Callback<R(A0, A1)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1)> callback(const U *obj, R(*func)(const T *, A0, A1))
-{
-    return Callback<R(A0, A1)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1)> callback(volatile U *obj, R(*func)(volatile T *, A0, A1))
-{
-    return Callback<R(A0, A1)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1)> callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1))
-{
-    return Callback<R(A0, A1)>(func, obj);
-}
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(R(*func)(A0, A1, A2) = 0)
-{
-    return Callback<R(A0, A1, A2)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(const Callback<R(A0, A1, A2)> &func)
-{
-    return Callback<R(A0, A1, A2)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(U *obj, R(T::*method)(A0, A1, A2))
-{
-    return Callback<R(A0, A1, A2)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(const U *obj, R(T::*method)(A0, A1, A2) const)
-{
-    return Callback<R(A0, A1, A2)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(volatile U *obj, R(T::*method)(A0, A1, A2) volatile)
-{
-    return Callback<R(A0, A1, A2)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(const volatile U *obj, R(T::*method)(A0, A1, A2) const volatile)
-{
-    return Callback<R(A0, A1, A2)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(R(*func)(T *, A0, A1, A2), U *arg)
-{
-    return Callback<R(A0, A1, A2)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(R(*func)(const T *, A0, A1, A2), const U *arg)
-{
-    return Callback<R(A0, A1, A2)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(R(*func)(volatile T *, A0, A1, A2), volatile U *arg)
-{
-    return Callback<R(A0, A1, A2)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-Callback<R(A0, A1, A2)> callback(R(*func)(const volatile T *, A0, A1, A2), const volatile U *arg)
-{
-    return Callback<R(A0, A1, A2)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2)> callback(U *obj, R(*func)(T *, A0, A1, A2))
-{
-    return Callback<R(A0, A1, A2)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2)> callback(const U *obj, R(*func)(const T *, A0, A1, A2))
-{
-    return Callback<R(A0, A1, A2)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2)> callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2))
-{
-    return Callback<R(A0, A1, A2)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2)> callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2))
-{
-    return Callback<R(A0, A1, A2)>(func, obj);
-}
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(R(*func)(A0, A1, A2, A3) = 0)
-{
-    return Callback<R(A0, A1, A2, A3)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(const Callback<R(A0, A1, A2, A3)> &func)
-{
-    return Callback<R(A0, A1, A2, A3)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(U *obj, R(T::*method)(A0, A1, A2, A3))
-{
-    return Callback<R(A0, A1, A2, A3)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(const U *obj, R(T::*method)(A0, A1, A2, A3) const)
-{
-    return Callback<R(A0, A1, A2, A3)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(volatile U *obj, R(T::*method)(A0, A1, A2, A3) volatile)
-{
-    return Callback<R(A0, A1, A2, A3)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(const volatile U *obj, R(T::*method)(A0, A1, A2, A3) const volatile)
-{
-    return Callback<R(A0, A1, A2, A3)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(R(*func)(T *, A0, A1, A2, A3), U *arg)
-{
-    return Callback<R(A0, A1, A2, A3)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(R(*func)(const T *, A0, A1, A2, A3), const U *arg)
-{
-    return Callback<R(A0, A1, A2, A3)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(R(*func)(volatile T *, A0, A1, A2, A3), volatile U *arg)
-{
-    return Callback<R(A0, A1, A2, A3)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-Callback<R(A0, A1, A2, A3)> callback(R(*func)(const volatile T *, A0, A1, A2, A3), const volatile U *arg)
-{
-    return Callback<R(A0, A1, A2, A3)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3)> callback(U *obj, R(*func)(T *, A0, A1, A2, A3))
-{
-    return Callback<R(A0, A1, A2, A3)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3)> callback(const U *obj, R(*func)(const T *, A0, A1, A2, A3))
-{
-    return Callback<R(A0, A1, A2, A3)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3)> callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3))
-{
-    return Callback<R(A0, A1, A2, A3)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3)> callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3))
-{
-    return Callback<R(A0, A1, A2, A3)>(func, obj);
-}
-
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(R(*func)(A0, A1, A2, A3, A4) = 0)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @return         Callback with inferred type
- */
-template <typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(const Callback<R(A0, A1, A2, A3, A4)> &func)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(U *obj, R(T::*method)(A0, A1, A2, A3, A4))
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(const U *obj, R(T::*method)(A0, A1, A2, A3, A4) const)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) volatile)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj      Optional pointer to object to bind to function
- *  @param method   Member function to attach
- *  @return         Callback with inferred type
- */
-template<typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(const volatile U *obj, R(T::*method)(A0, A1, A2, A3, A4) const volatile)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(obj, method);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(R(*func)(T *, A0, A1, A2, A3, A4), U *arg)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(R(*func)(const T *, A0, A1, A2, A3, A4), const U *arg)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(R(*func)(volatile T *, A0, A1, A2, A3, A4), volatile U *arg)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param func     Static function to attach
- *  @param arg      Pointer argument to function
- *  @return         Callback with inferred type
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-Callback<R(A0, A1, A2, A3, A4)> callback(R(*func)(const volatile T *, A0, A1, A2, A3, A4), const volatile U *arg)
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, arg);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3, A4)> callback(U *obj, R(*func)(T *, A0, A1, A2, A3, A4))
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3, A4)> callback(const U *obj, R(*func)(const T *, A0, A1, A2, A3, A4))
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3, A4)> callback(volatile U *obj, R(*func)(volatile T *, A0, A1, A2, A3, A4))
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, obj);
-}
-
-/** Create a callback class with type inferred from the arguments
- *
- *  @param obj  Optional pointer to object to bind to function
- *  @param func Static function to attach
- *  @return     Callback with inferred type
- *  @deprecated
- *      Arguments to callback have been reordered to callback(func, arg)
- */
-template <typename T, typename U, typename R, typename A0, typename A1, typename A2, typename A3, typename A4>
-MBED_DEPRECATED_SINCE("mbed-os-5.1",
-                      "Arguments to callback have been reordered to callback(func, arg)")
-Callback<R(A0, A1, A2, A3, A4)> callback(const volatile U *obj, R(*func)(const volatile T *, A0, A1, A2, A3, A4))
-{
-    return Callback<R(A0, A1, A2, A3, A4)>(func, obj);
-}
-
-/**@}*/
-
-/**@}*/
-
-} // namespace mbed
-
-#endif