cfunc

cfunc

// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

// insert


namespace trails_detail{
	template <typename... T>
	struct type_array {};

	template <typename T, typename ArrayT>
	struct type_insert;

	template <typename T, typename... TypesT>
	struct type_insert < T, type_array<TypesT...> >
	{
		typedef type_array<T, TypesT...> type;
	};

	// delete

	template <size_t N, typename ArrayT>
	struct type_delete;

	template <typename T1, typename... T>
	struct type_delete < 0, type_array<T1, T...> >
	{
		typedef type_array<T...> type;
	};

	template <typename T1, typename... T, size_t N>
	struct type_delete < N, type_array<T1, T...> >
	{
		typedef typename type_insert < T1,
			typename type_delete<N - 1,
			type_array<T...>
			>::type > ::type type;
	};

	// make function's parameters from a type_array

	template <typename R, typename ArrayT>
	struct make_func_par;

	template <typename R, typename... P>
	struct make_func_par < R, type_array<P...> >
	{
		typedef R type(P...);
	};

	// remove function's parameter

	template <size_t N, typename F>
	struct remove_func_par;

	template <size_t N, typename R, typename... P>
	struct remove_func_par < N, R(P...) >
	{
		typedef typename make_func_par < R,
			typename type_delete<N, type_array<P...>
			>::type > ::type type;
	};

}

template<int index, typename F>
struct cfunction;

template<int index, typename R, typename... Args>
struct cfunction < index, R(Args...) >
{
	typedef typename trails_detail::remove_func_par<index, R(Args...)>::type  Type_for_boost_Func;
	typedef typename std::function<Type_for_boost_Func> ClosureFuncType;

	// std::function<_F> _f;

	static R c_func(Args... args)
	{
		// 找到 index 的 args
		std::tuple<Args...> t_args(args...);
		void * p = std::get<index>(t_args);

		// 然后 push 并调用

		auto _f = reinterpret_cast<ClosureFuncType*>(p);

		// 	(*_f)(args...);		
	}
};


int main(void)
{
	trails_detail::remove_func_par<2, void(int, long, short)>::type* pp;
	std::cout << typeid(trails_detail::remove_func_par<1, void(const char * message, void* _apitag)>::type).name() << std::endl;

	typedef trails_detail::remove_func_par<1, void(const char * message, void* _apitag)>::type pt;
	std::function<pt> p;
	cfunction<1, void(const char * message, void* _apitag)> ppp;

	cfunction<1, void(const char * message, void* _apitag)>::c_func("123", 0);

	std::cout << typeid(decltype(p)).name() << std::endl;
	return 0;
}