#ifndef ONE_OF_HH

#define ONE_OF_HH

#include <tuple>

template<typename... Ts>

class one_of {

public:

	explicit constexpr one_of(Ts... ts) : tup(ts...) {}

	template<typename T> // abbreviated syntax triggered ICE in msvc?

	[[nodiscard]] friend constexpr bool operator==(const T& t, const one_of& o) {

		return std::apply([&](const Ts& ... ts) { return (... || (t == ts)); }, o.tup);

	}

private:

	std::tuple<Ts...> tup;

};

#endif