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78 lines
2.3 KiB
78 lines
2.3 KiB
#ifndef MEMBER_FUNCTION_CALLBACK_H
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#define MEMBER_FUNCTION_CALLBACK_H
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#include "mbed.h"
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#include "MicroBitEvent.h"
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/**
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* Class definition for a MemberFunctionCallback.
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*
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* C++ member functions (also known as methods) have a more complex
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* representation than normal C functions. This allows a referene to
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* a C++ member function to be stored then called at a later date.
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*
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* This class is used extensively by the MicroBitMessageBus to deliver
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* events to C++ methods.
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*/
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class MemberFunctionCallback
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{
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private:
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void* object;
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uint32_t method[4];
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void (*invoke)(void *object, uint32_t *method, MicroBitEvent e);
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template <typename T> static void methodCall(void* object, uint32_t*method, MicroBitEvent e);
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public:
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/**
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* Constructor. Creates a MemberFunctionCallback based on a pointer to given method.
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* @param object The object the callback method should be invooked on.
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* @param method The method to invoke.
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*/
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template <typename T> MemberFunctionCallback(T* object, void (T::*method)(MicroBitEvent e));
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/**
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* Comparison of two MemberFunctionCallback objects.
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* @return TRUE if the given MemberFunctionCallback is equivalent to this one. FALSE otherwise.
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*/
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bool operator==(const MemberFunctionCallback &mfc);
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/**
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* Calls the method reference held by this MemberFunctionCallback.
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* @param e The event to deliver to the method
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*/
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void fire(MicroBitEvent e);
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};
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/**
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* Constructor. Creates a representation of a pointer to a C++ member function (method).
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* @param object The object the callback method should be invooked on.
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* @param method The method to invoke.
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*/
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template <typename T>
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MemberFunctionCallback::MemberFunctionCallback(T* object, void (T::*method)(MicroBitEvent e))
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{
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this->object = object;
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memclr(this->method, sizeof(this->method));
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memcpy(this->method, &method, sizeof(method));
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invoke = &MemberFunctionCallback::methodCall<T>;
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}
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/**
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* Template to create static methods capable of invoking a C++ member function (method)
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* based on the given paramters.
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*/
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template <typename T>
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void MemberFunctionCallback::methodCall(void *object, uint32_t *method, MicroBitEvent e)
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{
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T* o = (T*)object;
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void (T::*m)(MicroBitEvent);
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memcpy(&m, method, sizeof(m));
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(o->*m)(e);
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}
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#endif
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