lambda_template

main.cpp

#include <iostream>
#include <functional>
#include <tuple>

namespace bbb {
	template <typename T>
	struct function_info : public function_info<decltype(&T::operator())> {};

	template <typename class_type, typename ret, typename ... arguments>
	struct function_info<ret(class_type::*)(arguments ...) const> {
		using function_type = std::function<ret(arguments ...)>;
	};
};

template <typename res, typename ... args>
void foo(std::function<res(args ...)> f) {
	std::cout << "yeah!! res: " << typeid(res).name() << ", args: " << typeid(std::tuple<args ...>).name() << std::endl;
}

void foo(std::function<int(int)> f) {
	std::cout << "yeah!! call: " << f(1) << std::endl;
}

template <typename fun>
void foo(fun f) {
	std::cout << "adaptor" << std::endl;
	foo(static_cast<typename bbb::function_info<fun>::function_type>(f));
}

int main(int argc, char *argv[]) {
	foo(static_cast<std::function<int(int)>>([](int) { return 3; }));
	foo([](int) { return 3; });
	
	return EXIT_SUCCESS;
}