mirror of https://github.com/ARMmbed/mbed-os.git
Add backward compatiblity for FunctionPointer class using Callback
effectively: typedef Callback<R(A)> FunctionPointerArg1<R,A> typedef Callback<R()> FunctionPointerArg1<R,void> typedef Callback<R()> FunctionPointer typedef Callback<R()> event_callback_tpull/1793/head
Christopher Haster
Jimmy Brisson
parent
15db3951df
commit
2e112f535a
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@ -16,187 +16,49 @@
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#ifndef MBED_FUNCTIONPOINTER_H
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#define MBED_FUNCTIONPOINTER_H
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#include "Callback.h"
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#include <string.h>
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#include <stdint.h>
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namespace mbed {
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/* If we had variaditic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */
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/** A class for storing and calling a pointer to a static or member function
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*/
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// Declarations for backwards compatibility
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// To be foward compatible, code should adopt the Callback class
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template <typename R, typename A1>
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class FunctionPointerArg1{
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class FunctionPointerArg1 : public Callback<R(A1)> {
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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 static function to attach (default is none)
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*/
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FunctionPointerArg1(R (*function)(A1) = 0) {
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attach(function);
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}
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FunctionPointerArg1(R (*function)(A1) = 0)
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: Callback<R(A1)>(function) {}
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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 member function to attach
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*/
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template<typename T>
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FunctionPointerArg1(T *object, R (T::*member)(A1)) {
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attach(object, member);
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}
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FunctionPointerArg1(T *object, R (T::*member)(A1))
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: Callback<R(A1)>(object, member) {}
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/** Attach a static function
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*
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* @param function The static function to attach (default is none)
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*/
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void attach(R (*function)(A1)) {
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_p.function = function;
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_membercaller = 0;
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R (*get_function())(A1) {
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return *reinterpret_cast<R (**)(A1)>(this);
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}
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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 member function to attach
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*/
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template<typename T>
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void attach(T *object, R (T::*member)(A1)) {
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_p.object = static_cast<void*>(object);
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*reinterpret_cast<R (T::**)(A1)>(_member) = member;
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_membercaller = &FunctionPointerArg1::membercaller<T>;
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}
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/** Call the attached static or member function
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*/
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R call(A1 a) {
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if (_membercaller == 0 && _p.function) {
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return _p.function(a);
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} else if (_membercaller && _p.object) {
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return _membercaller(_p.object, _member, a);
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}
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return (R)0;
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}
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/** Get registered static function
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*/
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R(*get_function(A1))() {
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return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
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}
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#ifdef MBED_OPERATORS
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R operator ()(A1 a) {
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return call(a);
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}
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operator bool(void) const {
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return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
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}
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#endif
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private:
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template<typename T>
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static R membercaller(void *object, uintptr_t *member, A1 a) {
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T* o = static_cast<T*>(object);
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R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
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return (o->**m)(a);
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}
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union {
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R (*function)(A1); // static function pointer
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void *object; // object this pointer
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} _p;
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uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
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R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
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};
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/** A class for storing and calling a pointer to a static or member function (R ()(void))
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*/
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template <typename R>
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class FunctionPointerArg1<R, void>{
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class FunctionPointerArg1<R, void> : public Callback<R()> {
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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 static function to attach (default is none)
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*/
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FunctionPointerArg1(R (*function)(void) = 0) {
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attach(function);
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}
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FunctionPointerArg1(R (*function)() = 0)
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: Callback<R()>(function) {}
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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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FunctionPointerArg1(T *object, R (T::*member)(void)) {
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attach(object, member);
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}
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FunctionPointerArg1(T *object, R (T::*member)())
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: Callback<R()>(object, member) {}
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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(R (*function)(void)) {
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_p.function = function;
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_membercaller = 0;
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R (*get_function())() {
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return *reinterpret_cast<R (**)()>(this);
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}
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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, R (T::*member)(void)) {
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_p.object = static_cast<void*>(object);
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*reinterpret_cast<R (T::**)(void)>(_member) = member;
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_membercaller = &FunctionPointerArg1::membercaller<T>;
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}
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/** Call the attached static or member function
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*/
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R call(){
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if (_membercaller == 0 && _p.function) {
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return _p.function();
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} else if (_membercaller && _p.object) {
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return _membercaller(_p.object, _member);
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}
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return (R)0;
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}
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/** Get registered static function
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*/
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R(*get_function())() {
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return _membercaller ? (R(*)())0 : (R(*)())_p.function;
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}
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#ifdef MBED_OPERATORS
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R operator ()(void) {
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return call();
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}
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operator bool(void) const {
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return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
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}
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#endif
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private:
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template<typename T>
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static R membercaller(void *object, uintptr_t *member) {
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T* o = static_cast<T*>(object);
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R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
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return (o->**m)();
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}
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union {
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R (*function)(void); // static function pointer
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void *object; // object this pointer
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} _p;
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uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
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R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
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};
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typedef FunctionPointerArg1<void, void> FunctionPointer;
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typedef FunctionPointerArg1<void, int> event_callback_t;
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} // namespace mbed
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#endif
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@ -65,6 +65,7 @@
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// mbed Non-hardware components
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#include "Callback.h"
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#include "FunctionPointer.h"
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using namespace mbed;
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using namespace std;
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