diff options
| -rw-r--r-- | absl/meta/type_traits.h | 5 | ||||
| -rw-r--r-- | absl/meta/type_traits_test.cc | 6 | ||||
| -rw-r--r-- | absl/strings/string_view.h | 1 | ||||
| -rw-r--r-- | absl/strings/string_view_test.cc | 8 |
4 files changed, 20 insertions, 0 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index a1be47f1..ded55820 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -630,6 +630,11 @@ template <typename T> struct IsView : std::integral_constant<bool, std::is_pointer<T>::value || IsViewImpl<T>::value> {}; +#ifdef ABSL_HAVE_STD_STRING_VIEW +template <typename Char, typename Traits> +struct IsView<std::basic_string_view<Char, Traits>> : std::true_type {}; +#endif + #ifdef __cpp_lib_span template <typename T> struct IsView<std::span<T>> : std::true_type {}; diff --git a/absl/meta/type_traits_test.cc b/absl/meta/type_traits_test.cc index e4107e53..1e056bb2 100644 --- a/absl/meta/type_traits_test.cc +++ b/absl/meta/type_traits_test.cc @@ -45,6 +45,12 @@ static_assert(IsOwnerAndNotView<std::string>::value, "string is an owner, not a view"); static_assert(IsOwnerAndNotView<std::wstring>::value, "wstring is an owner, not a view"); +#ifdef ABSL_HAVE_STD_STRING_VIEW +static_assert(!IsOwnerAndNotView<std::string_view>::value, + "string_view is a view, not an owner"); +static_assert(!IsOwnerAndNotView<std::wstring_view>::value, + "wstring_view is a view, not an owner"); +#endif template <class T, class U> struct simple_pair { diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h index b393c6fc..b1fb7a10 100644 --- a/absl/strings/string_view.h +++ b/absl/strings/string_view.h @@ -173,6 +173,7 @@ class string_view { using reverse_iterator = const_reverse_iterator; using size_type = size_t; using difference_type = std::ptrdiff_t; + using absl_internal_is_view = std::true_type; static constexpr size_type npos = static_cast<size_type>(-1); diff --git a/absl/strings/string_view_test.cc b/absl/strings/string_view_test.cc index 1c73943e..e978fc3f 100644 --- a/absl/strings/string_view_test.cc +++ b/absl/strings/string_view_test.cc @@ -47,6 +47,14 @@ namespace { +static_assert(!absl::type_traits_internal::IsOwner<absl::string_view>::value && + absl::type_traits_internal::IsView<absl::string_view>::value, + "string_view is a view, not an owner"); + +static_assert(absl::type_traits_internal::IsLifetimeBoundAssignment< + absl::string_view, std::string>::value, + "lifetimebound assignment not detected"); + // A minimal allocator that uses malloc(). template <typename T> struct Mallocator { |