Add is_swappable/is_nothrow_swappable traits
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@267079 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/stack b/include/stack
index 64fd652..48b3b0d 100644
--- a/include/stack
+++ b/include/stack
@@ -58,7 +58,7 @@
template <class... Args> void emplace(Args&&... args);
void pop();
- void swap(stack& c) noexcept(noexcept(swap(c, q.c)));
+ void swap(stack& c) noexcept(is_nothrow_swappable_v<Container>)
};
template <class T, class Container>
@@ -275,7 +275,10 @@
template <class _Tp, class _Container>
inline _LIBCPP_INLINE_VISIBILITY
-void
+typename enable_if<
+ __is_swappable<_Container>::value,
+ void
+>::type
swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
_NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{