Use noexcept instead of _GLIBCXX_NOEXCEPT

	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
	(basic_string::front() const, basic_string::back() const): Use
	noexcept instead of _GLIBCXX_NOEXCEPT macro.
	(__versa_string::front, __versa_string::back): Likewise.

From-SVN: r228434

libstdc++-v3/ChangeLog

 2015-10-02  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
+	(basic_string::front() const, basic_string::back() const): Use
+	noexcept instead of _GLIBCXX_NOEXCEPT macro.
+	(__versa_string::front, __versa_string::back): Likewise.
+
 	* acinclude.m4 (GLIBCXX_ENABLE_DEBUG_FLAGS): Fix comment.
 
 	* include/bits/locale_conv.h [!_GLIBCXX_USE_WCHAR_T]

libstdc++-v3/include/bits/basic_string.h

@@ -3441,7 +3441,7 @@ _GLIBCXX_END_NAMESPACE_CXX11
        *  element of the %string.
        */
       const_reference
-      front() const _GLIBCXX_NOEXCEPT
+      front() const noexcept
       {
 	__glibcxx_assert(!empty());
 	return operator[](0);
@@ -3463,7 +3463,7 @@ _GLIBCXX_END_NAMESPACE_CXX11
        *  last element of the %string.
        */
       const_reference
-      back() const _GLIBCXX_NOEXCEPT
+      back() const noexcept
       {
 	__glibcxx_assert(!empty());
 	return operator[](this->size() - 1);

libstdc++-v3/include/ext/vstring.h

@@ -613,7 +613,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  element of the %string.
        */
       reference
-      front() _GLIBCXX_NOEXCEPT
+      front() noexcept
       { return operator[](0); }
 
       /**
@@ -621,7 +621,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  element of the %string.
        */
       const_reference
-      front() const _GLIBCXX_NOEXCEPT
+      front() const noexcept
       { return operator[](0); }
 
       /**
@@ -629,7 +629,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  element of the %string.
        */
       reference
-      back() _GLIBCXX_NOEXCEPT
+      back() noexcept
       { return operator[](this->size() - 1); }
 
       /**
@@ -637,7 +637,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  last element of the %string.
        */
       const_reference
-      back() const _GLIBCXX_NOEXCEPT
+      back() const noexcept
       { return operator[](this->size() - 1); }
 #endif