alloc_traits.h (__alloc_traits::_S_nothrow_swap()): Use __is_nothrow_swappable.

	* include/ext/alloc_traits.h (__alloc_traits::_S_nothrow_swap()): Use
	__is_nothrow_swappable.

From-SVN: r224552

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index a9ed206..caa32f7 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2015-06-17  Jonathan Wakely  <jwakely@redhat.com>
+
+       * include/ext/alloc_traits.h (__alloc_traits::_S_nothrow_swap()): Use
+       __is_nothrow_swappable.
+
 2015-06-16  Jonathan Wakely  <jwakely@redhat.com>
 
        * include/bits/allocated_ptr.h (__allocated_ptr): Use __addressof.

diff --git a/libstdc++-v3/include/ext/alloc_traits.h b/libstdc++-v3/include/ext/alloc_traits.h
index 06bc70a..bd0f759 100644 (file)
--- a/libstdc++-v3/include/ext/alloc_traits.h
+++ b/libstdc++-v3/include/ext/alloc_traits.h
@@ -159,9 +159,8 @@ template<typename _Alloc>
 
     static constexpr bool _S_nothrow_swap()
     {
-      using std::swap;
       return !_S_propagate_on_swap()
-               || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
+       || std::__is_nothrow_swappable<_Alloc>::value;
     }
 
     template<typename _Tp>