inline_variable

inline_variable.cpp

#include <iostream>

template <typename type, typename tag = type>
struct inline_variable {
	static type &get(const type &initial_value) {
		static type _{initial_value};
		return _;
	}
};

struct p_tag;
static int &p{inline_variable<int, p_tag>::get(4)};

int main(int argc, char *argv[]) {
	std::cout << p << std::endl;
	return 0;
}