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mbed-classic/api/FunctionPointer.h

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/* 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