mirror of https://github.com/ARMmbed/mbed-os.git
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_FUNCTIONPOINTER_H
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#define MBED_FUNCTIONPOINTER_H
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#include <string.h>
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namespace mbed {
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typedef void (*pvoidf_t)(void);
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/** A class for storing and calling a pointer to a static or member void function
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*/
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class FunctionPointer {
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public:
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/** Create a FunctionPointer, attaching a static function
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*
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* @param function The void static function to attach (default is none)
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*/
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FunctionPointer(void (*function)(void) = 0);
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/** Create a FunctionPointer, attaching a member function
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*
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* @param object The object pointer to invoke the member function on (i.e. the this pointer)
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* @param function The address of the void member function to attach
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*/
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template<typename T>
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FunctionPointer(T *object, void (T::*member)(void)) {
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attach(object, member);
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}
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/** Attach a static function
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*
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* @param function The void static function to attach (default is none)
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*/
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void attach(void (*function)(void) = 0);
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/** Attach a member function
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*
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* @param object The object pointer to invoke the member function on (i.e. the this pointer)
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* @param function The address of the void member function to attach
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*/
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template<typename T>
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void attach(T *object, void (T::*member)(void)) {
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_object = static_cast<void*>(object);
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memcpy(_member, (char*)&member, sizeof(member));
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_membercaller = &FunctionPointer::membercaller<T>;
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_function = 0;
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}
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/** Call the attached static or member function
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*/
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void call();
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pvoidf_t get_function() const {
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return (pvoidf_t)_function;
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}
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#ifdef MBED_OPERATORS
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void operator ()(void);
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#endif
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private:
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template<typename T>
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static void membercaller(void *object, char *member) {
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T* o = static_cast<T*>(object);
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void (T::*m)(void);
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memcpy((char*)&m, member, sizeof(m));
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(o->*m)();
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}
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void (*_function)(void); // static function pointer - 0 if none attached
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void *_object; // object this pointer - 0 if none attached
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char _member[16]; // raw member function pointer storage - converted back by registered _membercaller
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void (*_membercaller)(void*, char*); // registered membercaller function to convert back and call _member on _object
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};
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} // namespace mbed
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#endif
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