Function invoke

extlibs/sol3/include/sol/sol.hpp:3603–3606

#endif
		     typename = enable_if_t<std::is_member_pointer<decay_t<Fn>>::value>, int = 0>
		constexpr auto invoke(Fn&& f, Args&&... args) noexcept(noexcept(std::mem_fn(f)(std::forward<Args>(args)...)))
		     -> decltype(std::mem_fn(f)(std::forward<Args>(args)...)) {
			return std::mem_fn(f)(std::forward<Args>(args)...);
		}

		template <typename Fn, typename... Args, typename = enable_if_t<!std::is_member_pointer<decay_t<Fn>>::value>>
		constexpr auto invoke(Fn&& f, Args&&... args) noexcept(noexcept(std::forward<Fn>(f)(std::forward<Args>(args)...)))