無名構造体もどき

gistfile1.cpp

#include<iostream>

#include<string>


namespace iod
{
	template<class...>
	struct iod_tuple{};

	template<class Head,class ...Tail>
	struct iod_tuple<Head, Tail...>: Head,iod_tuple<Tail...>
	{
		template<class H,class...T>
		iod_tuple(H&&head,T&&...args)
			:Head(std::forward<H>(head)),iod_tuple<Tail...>(std::forward<T>(args)...)
		{}
	};
}

#define define_iod_name(NAME) \
	template<class T>	\
struct NAME##_type{											 \
	template<class U>NAME##_type(U&&x) :NAME(std::forward<U>(x)){}	\
	T NAME;	\
};	\
template<class T>	\
using NAME = NAME##_type<T>;

define_iod_name(age)
define_iod_name(name)
define_iod_name(alive)
int main()
{
	iod::iod_tuple<age<int>, name<std::string>, alive<bool>> c{ 42, "Life", false };
	std::cout << c.age << c.name << c.alive;
}