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Diff: FunctionPointer.h
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- 0:666850d06c9f
diff -r 000000000000 -r 666850d06c9f FunctionPointer.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FunctionPointer.h Thu Aug 20 00:37:14 2015 +0000 @@ -0,0 +1,202 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2015 ARM Limited + * + * 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_FUNCTIONPOINTER_H +#define MBED_FUNCTIONPOINTER_H + +#include <string.h> +#include <stdint.h> + +namespace mbed { + +/* If we had variaditic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */ + +/** A class for storing and calling a pointer to a static or member function + */ +template <typename R, typename A1> +class FunctionPointerArg1{ +public: + /** Create a FunctionPointer, attaching a static function + * + * @param function The static function to attach (default is none) + */ + FunctionPointerArg1(R (*function)(A1) = 0) { + attach(function); + } + + /** Create a FunctionPointer, 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> + FunctionPointerArg1(T *object, R (T::*member)(A1)) { + attach(object, member); + } + + /** Attach a static function + * + * @param function The static function to attach (default is none) + */ + void attach(R (*function)(A1)) { + _p.function = function; + _membercaller = 0; + } + + /** 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::*member)(A1)) { + _p.object = static_cast<void*>(object); + *reinterpret_cast<R (T::**)(A1)>(_member) = member; + _membercaller = &FunctionPointerArg1::membercaller<T>; + } + + /** Call the attached static or member function + */ + R call(A1 a) { + if (_membercaller == 0 && _p.function) { + return _p.function(a); + } else if (_membercaller && _p.object) { + return _membercaller(_p.object, _member, a); + } + return (R)0; + } + + /** Get registered static function + */ + R(*get_function(A1))() { + return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function; + } + +#ifdef MBED_OPERATORS + R operator ()(A1 a) { + return call(a); + } + operator bool(void) const { + return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL; + } +#endif +private: + template<typename T> + static R membercaller(void *object, uintptr_t *member, A1 a) { + T* o = static_cast<T*>(object); + R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member); + return (o->**m)(a); + } + + union { + R (*function)(A1); // static function pointer + void *object; // object this pointer + } _p; + uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller + R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object +}; + +/** A class for storing and calling a pointer to a static or member function (R ()(void)) + */ +template <typename R> +class FunctionPointerArg1<R, void>{ +public: + /** Create a FunctionPointer, attaching a static function + * + * @param function The static function to attach (default is none) + */ + FunctionPointerArg1(R (*function)(void) = 0) { + attach(function); + } + + /** Create a FunctionPointer, 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 void member function to attach + */ + template<typename T> + FunctionPointerArg1(T *object, R (T::*member)(void)) { + attach(object, member); + } + + /** Attach a static function + * + * @param function The void static function to attach (default is none) + */ + void attach(R (*function)(void)) { + _p.function = function; + _membercaller = 0; + } + + /** 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 void member function to attach + */ + template<typename T> + void attach(T *object, R (T::*member)(void)) { + _p.object = static_cast<void*>(object); + *reinterpret_cast<R (T::**)(void)>(_member) = member; + _membercaller = &FunctionPointerArg1::membercaller<T>; + } + + /** Call the attached static or member function + */ + R call(){ + if (_membercaller == 0 && _p.function) { + return _p.function(); + } else if (_membercaller && _p.object) { + return _membercaller(_p.object, _member); + } + return (R)0; + } + + /** Get registered static function + */ + R(*get_function())() { + return _membercaller ? (R(*)())0 : (R(*)())_p.function; + } + +#ifdef MBED_OPERATORS + R operator ()(void) { + return call(); + } + operator bool(void) const { + return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL; + } +#endif + +private: + template<typename T> + static R membercaller(void *object, uintptr_t *member) { + T* o = static_cast<T*>(object); + R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member); + return (o->**m)(); + } + + union { + R (*function)(void); // static function pointer + void *object; // object this pointer + } _p; + uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller + R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object +}; + +typedef FunctionPointerArg1<void, void> FunctionPointer; +typedef FunctionPointerArg1<void, int> event_callback_t; + +} // namespace mbed + +#endif