libstdc++-v3/testsuite/20_util/forward/e.cc

   1 // { dg-do compile }
   2 // { dg-options "-std=gnu++0x" }
   3
   4 // Copyright (C) 2010-2013 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <utility>
  22
  23 template <class T>
  24   struct C
  25   {
  26     T t_;
  27
  28     C() { }
  29
  30     template <class U,
  31               class = typename std::enable_if
  32                     <
  33                         !std::is_lvalue_reference<U>::value
  34                     >::type>
  35       C(U&& u) : t_(std::forward<T>(std::move(u).get())) { }
  36
  37     C(C&& c) : t_(std::forward<T>(c.t_)) { }
  38   };
  39
  40 template <class T>
  41   struct Derived
  42   : C<T>
  43   {
  44     Derived() { }
  45     Derived(Derived&& d) : C<T>(std::forward<C<T>>(d)) { }
  46   };
  47
  48 // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
  49 // Test E.
  50 int main()
  51 {
  52   Derived<int> d;
  53   Derived<int> d2(std::move(d));
  54 }