diff options
| -rw-r--r-- | absl/meta/type_traits.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index 75689bb6..d5cb5f3b 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -610,8 +610,22 @@ using common_type_t = typename std::common_type<T...>::type; template <typename T> using underlying_type_t = typename std::underlying_type<T>::type; -template <typename T> -using result_of_t = typename std::result_of<T>::type; + +namespace type_traits_internal { + +#if __cplusplus >= 201703L +// std::result_of is deprecated (C++17) or removed (C++20) +template<typename> struct result_of; +template<typename F, typename... Args> +struct result_of<F(Args...)> : std::invoke_result<F, Args...> {}; +#else +template<typename F> using result_of = std::result_of<F>; +#endif + +} // namespace type_traits_internal + +template<typename F> +using result_of_t = typename type_traits_internal::result_of<F>::type; namespace type_traits_internal { // In MSVC we can't probe std::hash or stdext::hash because it triggers a |