libstdc++-v3/testsuite/20_util/shared_ptr/cons/weak_ptr.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2005, 2006, 2007 Free Software Foundation
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  22
  23 #include <memory>
  24 #include <testsuite_hooks.h>
  25
  26 struct A { };
  27
  28 // 20.6.6.2.1 shared_ptr constructors [util.smartptr.shared.const]
  29
  30 // Construction from weak_ptr
  31 int
  32 test01()
  33 {
  34   bool test __attribute__((unused)) = true;
  35
  36   A * const a = new A;
  37   std::shared_ptr<A> a1(a);
  38   std::weak_ptr<A> wa(a1);
  39   std::shared_ptr<A> a2(wa);
  40   VERIFY( a2.get() == a );
  41   VERIFY( a2.use_count() == wa.use_count() );
  42
  43   return 0;
  44 }
  45
  46
  47 int
  48 main()
  49 {
  50   test01();
  51   return 0;
  52 }