PR libstdc++/82685 add 'noexcept' to string_view literals

	PR libstdc++/82685
	* include/experimental/string_view (operator""sv): Add noexcept.
	* include/std/string_view (operator""sv): Likewise.

From-SVN: r254041

libstdc++-v3/ChangeLog

+2017-10-24  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/82685
+	* include/experimental/string_view (operator""sv): Add noexcept.
+	* include/std/string_view (operator""sv): Likewise.
+
 2017-10-23  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/Makefile.am: Add new headers for C++17 filesystem library.

libstdc++-v3/include/experimental/string_view

@@ -645,22 +645,22 @@ namespace experimental
   inline namespace string_view_literals
   {
     inline constexpr basic_string_view<char>
-    operator""sv(const char* __str, size_t __len)
+    operator""sv(const char* __str, size_t __len) noexcept
     { return basic_string_view<char>{__str, __len}; }
 
 #ifdef _GLIBCXX_USE_WCHAR_T
     inline constexpr basic_string_view<wchar_t>
-    operator""sv(const wchar_t* __str, size_t __len)
+    operator""sv(const wchar_t* __str, size_t __len) noexcept
     { return basic_string_view<wchar_t>{__str, __len}; }
 #endif
 
 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
     inline constexpr basic_string_view<char16_t>
-    operator""sv(const char16_t* __str, size_t __len)
+    operator""sv(const char16_t* __str, size_t __len) noexcept
     { return basic_string_view<char16_t>{__str, __len}; }
 
     inline constexpr basic_string_view<char32_t>
-    operator""sv(const char32_t* __str, size_t __len)
+    operator""sv(const char32_t* __str, size_t __len) noexcept
     { return basic_string_view<char32_t>{__str, __len}; }
 #endif
   } // namespace string_literals

libstdc++-v3/include/std/string_view

@@ -636,22 +636,22 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   inline namespace string_view_literals
   {
     inline constexpr basic_string_view<char>
-    operator""sv(const char* __str, size_t __len)
+    operator""sv(const char* __str, size_t __len) noexcept
     { return basic_string_view<char>{__str, __len}; }
 
 #ifdef _GLIBCXX_USE_WCHAR_T
     inline constexpr basic_string_view<wchar_t>
-    operator""sv(const wchar_t* __str, size_t __len)
+    operator""sv(const wchar_t* __str, size_t __len) noexcept
     { return basic_string_view<wchar_t>{__str, __len}; }
 #endif
 
 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
     inline constexpr basic_string_view<char16_t>
-    operator""sv(const char16_t* __str, size_t __len)
+    operator""sv(const char16_t* __str, size_t __len) noexcept
     { return basic_string_view<char16_t>{__str, __len}; }
 
     inline constexpr basic_string_view<char32_t>
-    operator""sv(const char32_t* __str, size_t __len)
+    operator""sv(const char32_t* __str, size_t __len) noexcept
     { return basic_string_view<char32_t>{__str, __len}; }
 #endif
   } // namespace string_literals