2010-11-11 Paolo Carlini <paolo.carlini@oracle.com>

	* include/bits/move.h (forward): Implement N3143, resolving US 90.
	* testsuite/20_util/forward/a.cc: New.
	* testsuite/20_util/forward/b.cc: Likewise.
	* testsuite/20_util/forward/c_neg.cc: Likewise.
	* testsuite/20_util/forward/d.cc: Likewise.
	* testsuite/20_util/forward/e.cc: Likewise.
	* testsuite/20_util/forward/f_neg.cc: Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@166599 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 77 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/20_util/forward/b.cc b/libstdc++-v3/testsuite/20_util/forward/b.cc
new file mode 100644
index 00000000000..4168800b468
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/forward/b.cc
@@ -0,0 +1,77 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2010 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/>.
+
+#include <list>
+#include <testsuite_hooks.h>
+
+template <class T>
+  struct C
+  {
+    T t_;
+
+    template <class U,
+              class = typename std::enable_if
+                    <
+                        !std::is_lvalue_reference<U>::value
+                    >::type>
+      C(U&& u) : t_(std::forward<T>(std::move(u).get())) {}
+  };
+
+class A
+{
+  int data_;
+public:
+  explicit
+  A(int data = 1)
+  : data_(data) { }
+
+  ~A() { data_ = -1; }
+
+  void test() const
+  {
+    bool test __attribute__((unused)) = true;
+    VERIFY( data_ == 3 );
+  }
+};
+
+class Awrap
+{
+  A a_;
+public:
+  explicit Awrap(const A& a) : a_(a) { }
+  A get() const { return a_; }
+};
+
+template <class C>
+void test(C c)
+{
+  c.t_.test();
+}
+
+// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
+// Test B.
+int main()
+{
+  std::list<C<A> > list;
+  A a(3);
+  C<A> c((Awrap(a)));
+  list.push_back(c);
+  test(c);
+  test(list.front());
+}