PR78052 Define std::allocator<void>::{construct,destroy}

	PR libstdc++/78052
	* include/bits/allocator.h (allocator<void>::construct)
	(allocator<void>::destroy): Define.
	* testsuite/20_util/allocator/void.cc: New test.

From-SVN: r241365

libstdc++-v3/ChangeLog

 2016-10-20  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/78052
+	* include/bits/allocator.h (allocator<void>::construct)
+	(allocator<void>::destroy): Define.
+	* testsuite/20_util/allocator/void.cc: New test.
+
 	* testsuite/20_util/enable_shared_from_this/56383.cc: Add tests for
 	additional ambiguous cases.
 

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

@@ -84,6 +84,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       typedef true_type propagate_on_container_move_assignment;
 
       typedef true_type is_always_equal;
+
+      template<typename _Up, typename... _Args>
+        void
+        construct(_Up* __p, _Args&&... __args)
+	{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
+
+      template<typename _Up>
+        void
+        destroy(_Up* __p) { __p->~_Up(); }
 #endif
     };
 

libstdc++-v3/testsuite/20_util/allocator/void.cc

+// Copyright (C) 2016 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-do run { target c++11 } }
+
+#include <memory>
+#include <testsuite_hooks.h>
+
+template class std::allocator<void>;
+
+void
+test01()
+{
+  int i;
+  using alloc_type = std::allocator<void>;
+  alloc_type a;
+  std::allocator_traits<alloc_type>::construct(a, &i, 42);
+  VERIFY( i == 42 );
+  std::allocator_traits<alloc_type>::destroy(a, &i);
+}
+
+int
+main()
+{
+  test01();
+}