diff options
Diffstat (limited to 'absl/meta/type_traits.h')
| -rw-r--r-- | absl/meta/type_traits.h | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index 457b8908..23ebd6ed 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -105,8 +105,25 @@ template <class To, template <class...> class Op, class... Args> struct is_detected_convertible : is_detected_convertible_impl<void, To, Op, Args...>::type {}; +template <typename T> +using IsCopyAssignableImpl = + decltype(std::declval<T&>() = std::declval<const T&>()); + +template <typename T> +using IsMoveAssignableImpl = decltype(std::declval<T&>() = std::declval<T&&>()); + } // namespace type_traits_internal +template <typename T> +struct is_copy_assignable : type_traits_internal::is_detected< + type_traits_internal::IsCopyAssignableImpl, T> { +}; + +template <typename T> +struct is_move_assignable : type_traits_internal::is_detected< + type_traits_internal::IsMoveAssignableImpl, T> { +}; + // void_t() // // Ignores the type of any its arguments and returns `void`. In general, this @@ -309,7 +326,7 @@ template <typename T> struct is_trivially_copy_assignable : std::integral_constant< bool, __has_trivial_assign(typename std::remove_reference<T>::type) && - std::is_copy_assignable<T>::value> { + absl::is_copy_assignable<T>::value> { #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE private: static constexpr bool compliant = @@ -409,11 +426,11 @@ struct IsHashEnabled : absl::conjunction<std::is_default_constructible<std::hash<Key>>, std::is_copy_constructible<std::hash<Key>>, std::is_destructible<std::hash<Key>>, - std::is_copy_assignable<std::hash<Key>>, + absl::is_copy_assignable<std::hash<Key>>, IsHashable<Key>> {}; + } // namespace type_traits_internal } // namespace absl - #endif // ABSL_META_TYPE_TRAITS_H_ |