ordered overload function oject

make_poly.hpp

namespace alol{
	template<class...T>
	class ordered_poly_lambda
	{
		struct stop{};
	public:
		void operator()(stop){}
	};
	template<class F, class ...T>
	class ordered_poly_lambda<F, T...>
	{
		F f;
		ordered_poly_lambda<T...> rest;
		template<class ...Args>
		auto call(int, Args&&...args)
			->decltype(std::forward<F>(f)(std::forward<Args>(args)...))
		{
			return std::forward<F>(f)(std::forward<Args>(args)...);
		}
		template<class ...Args>
		auto call(double, Args&&...args)
			->decltype(rest(std::forward<Args>(args)...))
		{
			return rest(std::forward<Args>(args)...);
		}
	public:
		ordered_poly_lambda(F&& f, T&&... args)
			:f(std::forward<F>(f)), rest(std::forward<T>(args)...)
		{}
		template<class ...Args>
		auto operator()(Args&&...args)
			->decltype(call(0, std::forward<Args>(args)...))
		{
			return call(0, std::forward<Args>(args)...);
		}
	};
	template<class...F>
	ordered_poly_lambda<F...> make_poly(F&&...f)
	{
		return{ std::forward<F>(f)... };
	}
}