mbed library sources
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api/FunctionPointer.h
- Committer:
- fwndz
- Date:
- 2016-12-21
- Revision:
- 636:de8f3520e5c1
- Parent:
- 525:c320967f86b9
File content as of revision 636:de8f3520e5c1:
/* 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