make_c_function

main.cpp

#include <functional>
#include <windows.>


template <typename F> struct c_function {
	static void called( HMIDIIN hMidiIn, UINT wMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 ){
		destFunction( hMidiIn, wMsg, dwInstance, dwParam1, dwParam2 );
	}
	
	static F destFunction;
	
};

template <typename F> F c_function<F>::destFunction;

template <typename Function, typename F> Function make_c_function( F func ){
	c_function<F>::destFunction = func;
	return &c_function<F>::called;
}

int main(){
	auto MidiInProc = make_c_function<void(*)(HMIDIIN, UINT, DWORD, DWORD, DWORD)>(
		std::function<void(HMIDIIN,UINT,DWORD,DWORD,DWORD)>(
			std::bind(
				&AppMA::MidiInProc,
				/* AppMAインスタンスへのポインタ*/,
				std::placeholders::_1,
				std::placeholders::_2,
				std::placeholders::_3,
				std::placeholders::_4,
				std::placeholders::_5
			)
		)
	);
			
	//midiInOpen(&hMidiIn, wSelDev, (DWORD)MidiInProc, NULL, CALLBACK_FUNCTION)
}