P0482R5 char8_t: Standard library support

[thirdparty/gcc.git] / libstdc++-v3 / include / experimental / string_view

diff --git a/libstdc++-v3/include/experimental/string_view b/libstdc++-v3/include/experimental/string_view
index 8cc0e90246b05f7ec5357fc6dd085dc139d9d406..ce2c14cfe361fb6b95c0c4f688fda74b64b5f3e6 100644 (file)
--- a/libstdc++-v3/include/experimental/string_view
+++ b/libstdc++-v3/include/experimental/string_view
@@ -565,6 +565,9 @@ inline namespace fundamentals_v1
   using string_view = basic_string_view<char>;
 #ifdef _GLIBCXX_USE_WCHAR_T
   using wstring_view = basic_string_view<wchar_t>;
+#endif
+#ifdef _GLIBCXX_USE_CHAR8_T
+  using u8string_view = basic_string_view<char8_t>;
 #endif
   using u16string_view = basic_string_view<char16_t>;
   using u32string_view = basic_string_view<char32_t>;
@@ -605,6 +608,21 @@ inline namespace fundamentals_v1
     { };
 #endif
 
+#ifdef _GLIBCXX_USE_CHAR8_T
+  template<>
+    struct hash<experimental::u8string_view>
+    : public __hash_base<size_t, experimental::u8string_view>
+    {
+      size_t
+      operator()(const experimental::u8string_view& __s) const noexcept
+      { return std::_Hash_impl::hash(__s.data(), __s.length()); }
+    };
+
+  template<>
+    struct __is_fast_hash<hash<experimental::u8string_view>> : std::false_type
+    { };
+#endif
+
   template<>
     struct hash<experimental::u16string_view>
     : public __hash_base<size_t, experimental::u16string_view>
@@ -652,6 +670,12 @@ namespace experimental
     { return basic_string_view<wchar_t>{__str, __len}; }
 #endif
 
+#ifdef _GLIBCXX_USE_CHAR8_T
+    inline constexpr basic_string_view<char8_t>
+    operator""sv(const char8_t* __str, size_t __len) noexcept
+    { return basic_string_view<char8_t>{__str, __len}; }
+#endif
+
     inline constexpr basic_string_view<char16_t>
     operator""sv(const char16_t* __str, size_t __len) noexcept
     { return basic_string_view<char16_t>{__str, __len}; }