libstdc++-v3/testsuite/20_util/shared_ptr/observers/unique.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2005-2020 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A { };
  26
  27 // 20.6.6.2.5 shared_ptr observers [util.smartptr.shared.obs]
  28
  29 // unique
  30 void
  31 test01()
  32 {
  33   const std::shared_ptr<A> p1;
  34   VERIFY( !p1.unique() );
  35   const std::shared_ptr<A> p2(p1);
  36   VERIFY( !p1.unique() );
  37 }
  38
  39 void
  40 test02()
  41 {
  42   std::shared_ptr<A> p1(new A);
  43   VERIFY( p1.unique() );
  44   std::shared_ptr<A> p2(p1);
  45   VERIFY( !p1.unique() );
  46   p1.reset();
  47   VERIFY( !p1.unique() );
  48   VERIFY( p2.unique() );
  49 }
  50
  51 void
  52 test03()
  53 {
  54   std::shared_ptr<A> p1(new A);
  55   std::shared_ptr<A> p2(p1);
  56   p2.reset(new A);
  57   VERIFY( p1.unique() );
  58   VERIFY( p2.unique() );
  59 }
  60
  61
  62 int
  63 main()
  64 {
  65   test01();
  66   test02();
  67   test03();
  68   return 0;
  69 }