Move allocator in std::string and RB tree move constructors

	PR libstdc++/71964
	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI]
	(basic_string::_Alloc_hider(pointer, _Alloc&&)): Add constructor.
	* include/bits/stl_tree.h (_Rb_tree(_Rb_tree&&)): Move allocator.
	* testsuite/21_strings/basic_string/allocator/71964.cc: New test.
	* testsuite/23_containers/set/allocator/71964.cc: New test.

From-SVN: r238647

libstdc++-v3/ChangeLog

 2016-07-22  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/71964
+	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI]
+	(basic_string::_Alloc_hider(pointer, _Alloc&&)): Add constructor.
+	* include/bits/stl_tree.h (_Rb_tree(_Rb_tree&&)): Move allocator.
+	* testsuite/21_strings/basic_string/allocator/71964.cc: New test.
+	* testsuite/23_containers/set/allocator/71964.cc: New test.
+
 	* testsuite/lib/libstdc++.exp (check_v3_target_namedlocale): Use
 	delete[] instead of delete.
 

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

@@ -106,8 +106,16 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       // Use empty-base optimization: http://www.cantrip.org/emptyopt.html
       struct _Alloc_hider : allocator_type // TODO check __is_final
       {
+#if __cplusplus < 201103L
 	_Alloc_hider(pointer __dat, const _Alloc& __a = _Alloc())
 	: allocator_type(__a), _M_p(__dat) { }
+#else
+	_Alloc_hider(pointer __dat, const _Alloc& __a)
+	: allocator_type(__a), _M_p(__dat) { }
+
+	_Alloc_hider(pointer __dat, _Alloc&& __a = _Alloc())
+	: allocator_type(std::move(__a)), _M_p(__dat) { }
+#endif
 
 	pointer _M_p; // The actual data.
       };

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

@@ -851,7 +851,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 
       _Rb_tree(_Rb_tree&& __x)
-      : _M_impl(__x._M_impl._M_key_compare, __x._M_get_Node_allocator())
+      : _M_impl(__x._M_impl._M_key_compare,
+		std::move(__x._M_get_Node_allocator()))
       {
 	if (__x._M_root() != 0)
 	  _M_move_data(__x, std::true_type());

libstdc++-v3/testsuite/21_strings/basic_string/allocator/71964.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-options "-std=gnu++11" }
+
+#include <string>
+#include <testsuite_hooks.h>
+
+template<typename T>
+  struct mv_allocator
+  {
+    using value_type = T;
+    using size_type = unsigned;
+
+    mv_allocator()
+    : moved_to(false), moved_from(false) { }
+
+    template<typename U>
+      mv_allocator(const mv_allocator<U> & a)
+      : moved_to(a.moved_to), moved_from(a.moved_from) { }
+
+    mv_allocator(const mv_allocator &) = default;
+
+    mv_allocator(mv_allocator && a) noexcept : moved_to(true)
+    {
+      a.moved_from = true;
+    }
+
+    T* allocate(unsigned n) { return std::allocator<T>{}.allcoate(n); }
+    void deallocate(T* p, unsigned n) { std::allocator<T>{}.deallocate(p, n); }
+
+    bool moved_to;
+    bool moved_from;
+  };
+
+template<typename T, typename U>
+bool
+operator==(const mv_allocator<T>&, const mv_allocator<U>&) { return true; }
+
+template<typename T, typename U>
+bool
+operator!=(const mv_allocator<T>&, const mv_allocator<U>&) { return false; }
+
+void
+test01()
+{
+  // COW strings don't support C++11 allocators
+#if _GLIBCXX_USE_CXX11_ABI
+  std::basic_string<char, std::char_traits<char>, mv_allocator<char>> s;
+  auto t = std::move(s);
+  VERIFY( s.get_allocator().moved_from );
+  VERIFY( t.get_allocator().moved_to );
+#endif
+}
+
+int
+main()
+{
+  test01();
+}

libstdc++-v3/testsuite/23_containers/set/allocator/71964.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-options "-std=gnu++11" }
+
+#include <set>
+#include <testsuite_hooks.h>
+
+template<typename T>
+  struct mv_allocator
+  {
+    using value_type = T;
+    using size_type = unsigned;
+
+    mv_allocator()
+    : moved_to(false), moved_from(false) { }
+
+    template<typename U>
+      mv_allocator(const mv_allocator<U> & a)
+      : moved_to(a.moved_to), moved_from(a.moved_from) { }
+
+    mv_allocator(const mv_allocator &) = default;
+
+    mv_allocator(mv_allocator && a) noexcept : moved_to(true)
+    {
+      a.moved_from = true;
+    }
+
+    T* allocate(unsigned n) { return std::allocator<T>{}.allcoate(n); }
+    void deallocate(T* p, unsigned n) { std::allocator<T>{}.deallocate(p, n); }
+
+    bool moved_to;
+    bool moved_from;
+  };
+
+template<typename T, typename U>
+bool
+operator==(const mv_allocator<T>&, const mv_allocator<U>&) { return true; }
+
+template<typename T, typename U>
+bool
+operator!=(const mv_allocator<T>&, const mv_allocator<U>&) { return false; }
+
+void
+test01()
+{
+  std::set<int, std::less<int>, mv_allocator<int>> s;
+  auto t = std::move(s);
+  VERIFY( s.get_allocator().moved_from );
+  VERIFY( t.get_allocator().moved_to );
+}
+
+int
+main()
+{
+  test01();
+}