c++ - Is-braces-constructible type trait -

how can check whether specific type typename t constructible arguments typename ...args in manner t{args...}? aware of std::is_constructible< t, args... > type trait <type_traits>, works parentheses, not curly braces. not have experience in writing of type traits, cannot provide initial example. simplification can accept reasonable assertions, if leads not significant loss of generality.

template<class t, typename... args> decltype(void(t{std::declval<args>()...}), std::true_type()) test(int);  template<class t, typename... args> std::false_type test(...);  template<class t, typename... args> struct is_braces_constructible : decltype(test<t, args...>(0)) { };