@@ -109,7 +109,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
using std::swap;
swap(_M_ptr, __nh._M_ptr);
- if (_AllocTraits::propagate_on_container_swap
+ if (_AllocTraits::propagate_on_container_swap::value
|| !_M_alloc || !__nh._M_alloc)
_M_alloc.swap(__nh._M_alloc);
else
new file mode 100644
@@ -0,0 +1,48 @@
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do run { target c++17 } }
+
+#include <set>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ // PR libstdc++/82966
+ std::set<int>::node_type n1, n2;
+ n1.swap(n2);
+ VERIFY( n1.empty() );
+ VERIFY( n2.empty() );
+}
+
+void
+test02()
+{
+ std::set<int> s{1, 2};
+ std::set<int>::node_type n1 = s.extract(1), n2;
+ swap(n1, n2);
+ VERIFY( n1.empty() );
+ VERIFY( !n2.empty() );
+}
+
+int main()
+{
+ test01();
+ test02();
+}