Diff: api/FunctionPointer.h

Revision:

11:f08e03081748

Parent:

7:4fdb3a44f646

Child:

14:4af7fef9cf08

--- a/api/FunctionPointer.h	Thu Mar 31 19:42:45 2016 -0500
+++ b/api/FunctionPointer.h	Thu Mar 31 19:59:25 2016 -0500
@@ -16,19 +16,747 @@
 #ifndef MBED_FUNCTIONPOINTER_H
 #define MBED_FUNCTIONPOINTER_H
 
-#include "Function.h"
+#include <string.h>
+#include <stdint.h>
 
 namespace mbed {
 
+// Reusable FunctionPointerArgs class based on template specialization
+template <typename F>
+class FunctionPointerArgs;
+
+/** A class for storing and calling a pointer to a static or member function
+ */
+template <typename R, typename A1, typename A2, typename A3, typename A4>
+class FunctionPointerArgs<R(A1, A2, A3, A4)> {
+public:
+    /** Create a FunctionPointerArgs, attaching a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    FunctionPointerArgs(R (*function)(A1, A2, A3, A4) = 0) {
+        attach(function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (*function)(T*, A1, A2, A3, A4)) {
+        attach(object, function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (T::*member)(A1, A2, A3, A4)) {
+        attach(object, member);
+    }
+
+    /** Create a FunctionPointerArgs from another FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    FunctionPointerArgs(const FunctionPointerArgs<R(A1, A2, A3, A4)> &func) {
+        attach(func);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    void attach(R (*function)(A1, A2, A3, A4)) {
+        _object = 0;
+        *reinterpret_cast<R (**)(A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::staticthunk;
+    }
+
+    /** Attach a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template <typename T>
+    void attach(T *object, R (*function)(A1, A2, A3, A4)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (**)(T*, A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::boundthunk<T>;
+    }
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    void attach(T *object, R (T::*method)(A1, A2, A3, A4)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (T::**)(A1)>(_function) = method;
+        _thunk = &FunctionPointerArgs::methodthunk<T>;
+    }
+
+    /** Attach a FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    void attach(const FunctionPointerArgs<R(A1, A2, A3, A4)> &func) {
+        _object = func._object;
+        memcpy(_function, func._function, sizeof _function);
+        _thunk = func._thunk;
+    }
+
+    /** Call the attached static or member function
+     */
+    R call(A1 a1, A2 a2, A3 a3, A4 a4) {
+        return _thunk(_object, _function, a1, a2, a3, a4);
+    }
+
+    /** Get registered static function
+     */
+    R (*get_function(A1, A2, A3, A4))() {
+        return reinterpret_cast<R (*)(A1, A2, A3, A4)>(_object ? 0 : _function);
+    }
+
+#ifdef MBED_OPERATORS
+    R operator ()(A1 a1, A2 a2, A3 a3, A4 a4) {
+        return call(a1, a2, a3, a4);
+    }
+    operator bool(void) const {
+        return static_cast<bool>(_function);
+    }
+#endif
+private:
+    // Static thunks for various function types
+    static R staticthunk(void *eh, void *func, A1 a1, A2 a2, A3 a3, A4 a4) {
+        R (*f)(A1, A2, A3, A4) = *reinterpret_cast<R (**)(A1, A2, A3, A4)>(func);
+        return f(a1, a2, a3, a4);
+    }
+
+    template<typename T>
+    static R boundthunk(void *object, void *func, A1 a1, A2 a2, A3 a3, A4 a4) {
+        T *o = static_cast<T*>(object);
+        R (*f)(T*, A1) = *reinterpret_cast<R (**)(T*, A1)>(func);
+        return f(o, a1);
+    }
+
+    template<typename T>
+    static R methodthunk(void *object, void *member, A1 a1, A2 a2, A3 a3, A4 a4) {
+        T* o = static_cast<T*>(object);
+        R (T::*m)(A1, A2, A3, A4) = *reinterpret_cast<R (T::**)(A1, A2, A3, A4)>(member);
+        return (o->*m)(a1, a2, a3, a4);
+    }
+
+    // Forward declaration of an unknown class
+    // this kind of declaration is authorized by the standard (see 8.3.3/2 of C++ 03 standard).  
+    // As a result, the compiler will allocate for UnknownFunctionMember_t the biggest size 
+    // and biggest alignment possible for member function. 
+    // This type can be used inside unions, it will help to provide the storage 
+    // with the proper size and alignment guarantees 
+    class UnknownClass;
+
+    // object this pointer
+    void *_object;
+
+    // aligned raw member function pointer storage - converted back by registered thunk
+    char _function[sizeof(void (UnknownClass::*)())];
+
+    // registered function to convert back and call _m.member on _object
+    R (*_thunk)(void*, void*, A1, A2, A3, A4); 
+};
+
+/** A class for storing and calling a pointer to a static or member function
+ */
+template <typename R, typename A1, typename A2, typename A3>
+class FunctionPointerArgs<R(A1, A2, A3)> {
+public:
+    /** Create a FunctionPointerArgs, attaching a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    FunctionPointerArgs(R (*function)(A1, A2, A3) = 0) {
+        attach(function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (*function)(T*, A1, A2, A3)) {
+        attach(object, function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (T::*member)(A1, A2, A3)) {
+        attach(object, member);
+    }
+
+    /** Create a FunctionPointerArgs from another FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    FunctionPointerArgs(const FunctionPointerArgs<R(A1, A2, A3)> &func) {
+        attach(func);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    void attach(R (*function)(A1, A2, A3)) {
+        _object = 0;
+        *reinterpret_cast<R (**)(A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::staticthunk;
+    }
+
+    /** Attach a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template <typename T>
+    void attach(T *object, R (*function)(A1, A2, A3)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (**)(T*, A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::boundthunk<T>;
+    }
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    void attach(T *object, R (T::*method)(A1, A2, A3)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (T::**)(A1)>(_function) = method;
+        _thunk = &FunctionPointerArgs::methodthunk<T>;
+    }
+
+    /** Attach a FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    void attach(const FunctionPointerArgs<R(A1, A2, A3)> &func) {
+        _object = func._object;
+        memcpy(_function, func._function, sizeof _function);
+        _thunk = func._thunk;
+    }
+
+    /** Call the attached static or member function
+     */
+    R call(A1 a1, A2 a2, A3 a3) {
+        return _thunk(_object, _function, a1, a2, a3);
+    }
+
+    /** Get registered static function
+     */
+    R (*get_function(A1, A2, A3))() {
+        return reinterpret_cast<R (*)(A1, A2, A3)>(_object ? 0 : _function);
+    }
+
+#ifdef MBED_OPERATORS
+    R operator ()(A1 a1, A2 a2, A3 a3) {
+        return call(a1, a2, a3);
+    }
+    operator bool(void) const {
+        return static_cast<bool>(_function);
+    }
+#endif
+private:
+    // Static thunks for various function types
+    static R staticthunk(void *eh, void *func, A1 a1, A2 a2, A3 a3) {
+        R (*f)(A1, A2, A3) = *reinterpret_cast<R (**)(A1, A2, A3)>(func);
+        return f(a1, a2, a3);
+    }
+
+    template<typename T>
+    static R boundthunk(void *object, void *func, A1 a1, A2 a2, A3 a3) {
+        T *o = static_cast<T*>(object);
+        R (*f)(T*, A1) = *reinterpret_cast<R (**)(T*, A1)>(func);
+        return f(o, a1);
+    }
+
+    template<typename T>
+    static R methodthunk(void *object, void *member, A1 a1, A2 a2, A3 a3) {
+        T* o = static_cast<T*>(object);
+        R (T::*m)(A1, A2, A3) = *reinterpret_cast<R (T::**)(A1, A2, A3)>(member);
+        return (o->*m)(a1, a2, a3);
+    }
+
+    // Forward declaration of an unknown class
+    // this kind of declaration is authorized by the standard (see 8.3.3/2 of C++ 03 standard).  
+    // As a result, the compiler will allocate for UnknownFunctionMember_t the biggest size 
+    // and biggest alignment possible for member function. 
+    // This type can be used inside unions, it will help to provide the storage 
+    // with the proper size and alignment guarantees 
+    class UnknownClass;
+
+    // object this pointer
+    void *_object;
+
+    // aligned raw member function pointer storage - converted back by registered thunk
+    char _function[sizeof(void (UnknownClass::*)())];
+
+    // registered function to convert back and call _m.member on _object
+    R (*_thunk)(void*, void*, A1, A2, A3); 
+};
+
+/** A class for storing and calling a pointer to a static or member function
+ */
+template <typename R, typename A1, typename A2>
+class FunctionPointerArgs<R(A1, A2)> {
+public:
+    /** Create a FunctionPointerArgs, attaching a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    FunctionPointerArgs(R (*function)(A1, A2) = 0) {
+        attach(function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (*function)(T*, A1, A2)) {
+        attach(object, function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (T::*member)(A1, A2)) {
+        attach(object, member);
+    }
+
+    /** Create a FunctionPointerArgs from another FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    FunctionPointerArgs(const FunctionPointerArgs<R(A1, A2)> &func) {
+        attach(func);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    void attach(R (*function)(A1, A2)) {
+        _object = 0;
+        *reinterpret_cast<R (**)(A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::staticthunk;
+    }
+
+    /** Attach a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template <typename T>
+    void attach(T *object, R (*function)(A1, A2)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (**)(T*, A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::boundthunk<T>;
+    }
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    void attach(T *object, R (T::*method)(A1, A2)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (T::**)(A1)>(_function) = method;
+        _thunk = &FunctionPointerArgs::methodthunk<T>;
+    }
+
+    /** Attach a FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    void attach(const FunctionPointerArgs<R(A1, A2)> &func) {
+        _object = func._object;
+        memcpy(_function, func._function, sizeof _function);
+        _thunk = func._thunk;
+    }
+
+    /** Call the attached static or member function
+     */
+    R call(A1 a1, A2 a2) {
+        return _thunk(_object, _function, a1, a2);
+    }
+
+    /** Get registered static function
+     */
+    R (*get_function(A1, A2))() {
+        return reinterpret_cast<R (*)(A1, A2)>(_object ? 0 : _function);
+    }
+
+#ifdef MBED_OPERATORS
+    R operator ()(A1 a1, A2 a2) {
+        return call(a1, a2);
+    }
+    operator bool(void) const {
+        return static_cast<bool>(_function);
+    }
+#endif
+private:
+    // Static thunks for various function types
+    static R staticthunk(void *eh, void *func, A1 a1, A2 a2) {
+        R (*f)(A1, A2) = *reinterpret_cast<R (**)(A1, A2)>(func);
+        return f(a1, a2);
+    }
+
+    template<typename T>
+    static R boundthunk(void *object, void *func, A1 a1, A2 a2) {
+        T *o = static_cast<T*>(object);
+        R (*f)(T*, A1) = *reinterpret_cast<R (**)(T*, A1)>(func);
+        return f(o, a1);
+    }
+
+    template<typename T>
+    static R methodthunk(void *object, void *member, A1 a1, A2 a2) {
+        T* o = static_cast<T*>(object);
+        R (T::*m)(A1, A2) = *reinterpret_cast<R (T::**)(A1, A2)>(member);
+        return (o->*m)(a1, a2);
+    }
+
+    // Forward declaration of an unknown class
+    // this kind of declaration is authorized by the standard (see 8.3.3/2 of C++ 03 standard).  
+    // As a result, the compiler will allocate for UnknownFunctionMember_t the biggest size 
+    // and biggest alignment possible for member function. 
+    // This type can be used inside unions, it will help to provide the storage 
+    // with the proper size and alignment guarantees 
+    class UnknownClass;
+
+    // object this pointer
+    void *_object;
+
+    // aligned raw member function pointer storage - converted back by registered thunk
+    char _function[sizeof(void (UnknownClass::*)())];
+
+    // registered function to convert back and call _m.member on _object
+    R (*_thunk)(void*, void*, A1, A2); 
+};
+
+/** A class for storing and calling a pointer to a static or member function
+ */
+template <typename R, typename A1>
+class FunctionPointerArgs<R(A1)> {
+public:
+    /** Create a FunctionPointerArgs, attaching a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    FunctionPointerArgs(R (*function)(A1) = 0) {
+        attach(function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (*function)(T*, A1)) {
+        attach(object, function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (T::*member)(A1)) {
+        attach(object, member);
+    }
+
+    /** Create a FunctionPointerArgs from another FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    FunctionPointerArgs(const FunctionPointerArgs<R(A1)> &func) {
+        attach(func);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    void attach(R (*function)(A1)) {
+        _object = 0;
+        *reinterpret_cast<R (**)(A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::staticthunk;
+    }
+
+    /** Attach a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template <typename T>
+    void attach(T *object, R (*function)(A1)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (**)(T*, A1)>(_function) = function;
+        _thunk = &FunctionPointerArgs::boundthunk<T>;
+    }
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    void attach(T *object, R (T::*method)(A1)) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (T::**)(A1)>(_function) = method;
+        _thunk = &FunctionPointerArgs::methodthunk<T>;
+    }
+
+    /** Attach a FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    void attach(const FunctionPointerArgs<R(A1)> &func) {
+        _object = func._object;
+        memcpy(_function, func._function, sizeof _function);
+        _thunk = func._thunk;
+    }
+
+    /** Call the attached static or member function
+     */
+    R call(A1 a1) {
+        return _thunk(_object, _function, a1);
+    }
+
+    /** Get registered static function
+     */
+    R (*get_function(A1))() {
+        return reinterpret_cast<R (*)(A1)>(_object ? 0 : _function);
+    }
+
+#ifdef MBED_OPERATORS
+    R operator ()(A1 a1) {
+        return call(a1);
+    }
+    operator bool(void) const {
+        return static_cast<bool>(_function);
+    }
+#endif
+private:
+    // Static thunks for various function types
+    static R staticthunk(void *eh, void *func, A1 a1) {
+        R (*f)(A1) = *reinterpret_cast<R (**)(A1)>(func);
+        return f(a1);
+    }
+
+    template<typename T>
+    static R boundthunk(void *object, void *func, A1 a1) {
+        T *o = static_cast<T*>(object);
+        R (*f)(T*, A1) = *reinterpret_cast<R (**)(T*, A1)>(func);
+        return f(o, a1);
+    }
+
+    template<typename T>
+    static R methodthunk(void *object, void *member, A1 a1) {
+        T* o = static_cast<T*>(object);
+        R (T::*m)(A1) = *reinterpret_cast<R (T::**)(A1)>(member);
+        return (o->*m)(a1);
+    }
+
+    // Forward declaration of an unknown class
+    // this kind of declaration is authorized by the standard (see 8.3.3/2 of C++ 03 standard).  
+    // As a result, the compiler will allocate for UnknownFunctionMember_t the biggest size 
+    // and biggest alignment possible for member function. 
+    // This type can be used inside unions, it will help to provide the storage 
+    // with the proper size and alignment guarantees 
+    class UnknownClass;
+
+    // object this pointer
+    void *_object;
+
+    // aligned raw member function pointer storage - converted back by registered thunk
+    char _function[sizeof(void (UnknownClass::*)())];
+
+    // registered function to convert back and call _m.member on _object
+    R (*_thunk)(void*, void*, A1); 
+};
+
+/** A class for storing and calling a pointer to a static or member function
+ */
+template <typename R>
+class FunctionPointerArgs<R()> {
+public:
+    /** Create a FunctionPointerArgs, attaching a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    FunctionPointerArgs(R (*function)() = 0) {
+        attach(function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (*function)(T*)) {
+        attach(object, function);
+    }
+
+    /** Create a FunctionPointerArgs, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    FunctionPointerArgs(T *object, R (T::*member)()) {
+        attach(object, member);
+    }
+
+    /** Create a FunctionPointerArgs from another FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    FunctionPointerArgs(const FunctionPointerArgs<R()> &func) {
+        attach(func);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The static function to attach (default is none)
+     */
+    void attach(R (*function)()) {
+        _object = 0;
+        *reinterpret_cast<R (**)()>(_function) = function;
+        _thunk = &FunctionPointerArgs::staticthunk;
+    }
+
+    /** Attach a static function with bound pointer
+     *
+     *  @param object Pointer to object to bind to function
+     *  @param function The static function to attach
+     */
+    template <typename T>
+    void attach(T *object, R (*function)()) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (**)(T*)>(_function) = function;
+        _thunk = &FunctionPointerArgs::boundthunk<T>;
+    }
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the member function to attach
+     */
+    template<typename T>
+    void attach(T *object, R (T::*method)()) {
+        _object = static_cast<void*>(object);
+        *reinterpret_cast<R (T::**)()>(_function) = method;
+        _thunk = &FunctionPointerArgs::methodthunk<T>;
+    }
+
+    /** Attach a FunctionPointerArgs
+     *
+     *  @param func The func to attach
+     */
+    void attach(const FunctionPointerArgs<R()> &func) {
+        _object = func._object;
+        memcpy(_function, func._function, sizeof _function);
+        _thunk = func._thunk;
+    }
+
+    /** Call the attached static or member function
+     */
+    R call() {
+        return _thunk(_object, _function);
+    }
+
+    /** Get registered static function
+     */
+    R (*get_function())() {
+        return reinterpret_cast<R (*)()>(_object ? 0 : _function);
+    }
+
+#ifdef MBED_OPERATORS
+    R operator ()() {
+        return call();
+    }
+    operator bool(void) const {
+        return static_cast<bool>(_function);
+    }
+#endif
+private:
+    // Static thunks for various function types
+    static R staticthunk(void *eh, void *func) {
+        R (*f)() = *reinterpret_cast<R (**)()>(func);
+        return f();
+    }
+
+    template<typename T>
+    static R boundthunk(void *object, void *func) {
+        T *o = static_cast<T*>(object);
+        R (*f)(T*) = *reinterpret_cast<R (**)(T*)>(func);
+        return f(o);
+    }
+
+    template<typename T>
+    static R methodthunk(void *object, void *member) {
+        T* o = static_cast<T*>(object);
+        R (T::*m)() = *reinterpret_cast<R (T::**)()>(member);
+        return (o->*m)();
+    }
+
+    // Forward declaration of an unknown class
+    // this kind of declaration is authorized by the standard (see 8.3.3/2 of C++ 03 standard).  
+    // As a result, the compiler will allocate for UnknownFunctionMember_t the biggest size 
+    // and biggest alignment possible for member function. 
+    // This type can be used inside unions, it will help to provide the storage 
+    // with the proper size and alignment guarantees 
+    class UnknownClass;
+
+    // object this pointer
+    void *_object;
+
+    // aligned raw member function pointer storage - converted back by registered thunk
+    union {
+        char _function[sizeof(void (UnknownClass::*)())];
+        void (UnknownClass::*_unknownMethod)();
+    };
+
+    // registered function to convert back and call _m.member on _object
+    R (*_thunk)(void*, void*); 
+};
+
 // Overloads for backwards compatibility
 template <typename R, typename A1>
-class FunctionArg1 : public Function<R(A1)> {};
+class FunctionPointerArg1 : public FunctionPointerArgs<R(A1)> {};
 
 template <typename R>
-class FunctionArg1<R, void> : public Function<R()> {};
+class FunctionPointerArg1<R, void> : public FunctionPointerArgs<R()> {};
 
-typedef Function<void()> FunctionPointer;
-typedef Function<void(int)> event_callback_t;
+typedef FunctionPointerArgs<void()> FunctionPointer;
+typedef FunctionPointerArgs<void(int)> event_callback_t;
 
 } // namespace mbed