/* CrO2 datassette emulator
 * Copyright 2012, Adrien Destugues <pulkomandy@pulkomandy.ath.cx>
 *
 * Distributed under the terms of the MIT licence.
 */

#include <iup.h>

template<class Handler, typename ret = int, typename... Args> class Callback
{
	typedef ret(Handler::*T)(Args... args);

	public:
		static int destroy(Ihandle* that)
		{
			Callback* call = (Callback*)IupGetAttribute(that, "LCALLBACK");
			delete call;
			return IUP_DEFAULT;
		}

		static void create(Ihandle* handle, const char* name, Handler* self, T what)
		{
			Callback* cb = new Callback(self, what);
			IupSetAttribute(handle, "LCALLBACK", (char*)cb);
			IupSetCallback(handle, name, (Icallback)Callback::call);
			IupSetCallback(handle, "LDESTROY_CB", Callback::destroy);
		}

		static ret call(Ihandle* that, Args... args)
		{
			Callback* call = (Callback*)IupGetAttribute(that, "LCALLBACK");
			return ((call->self)->*(call->what))(args...);
		}

	private:
		Callback(Handler* self, T what)
		{
			this->self = self;
			this->what = what;
		}

		Callback(); // do not use

		Handler* self;
		T what;
};