libstdc++-v3/testsuite/20_util/shared_ptr/observers/use_count.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 struct B : A { };
  28
  29 // 20.6.6.2.5 shared_ptr observers [util.smartptr.shared.obs]
  30
  31 // use_count
  32 int
  33 test01()
  34 {
  35   bool test __attribute__((unused)) = true;
  36
  37   const std::shared_ptr<A> p1;
  38   VERIFY( p1.use_count() == 0 );
  39   const std::shared_ptr<A> p2(p1);
  40   VERIFY( p1.use_count() == 0 );
  41
  42   return 0;
  43 }
  44
  45 int
  46 test02()
  47 {
  48   bool test __attribute__((unused)) = true;
  49
  50   std::shared_ptr<A> p1(new A);
  51   std::shared_ptr<A> p2(p1);
  52   p1.reset();
  53   VERIFY( p1.use_count() == 0 );
  54   VERIFY( p2.use_count() == 1 );
  55
  56   return 0;
  57 }
  58
  59 int
  60 test03()
  61 {
  62   bool test __attribute__((unused)) = true;
  63
  64   std::shared_ptr<A> p1(new A);
  65   std::shared_ptr<A> p2(p1);
  66   p2.reset(new B);
  67   VERIFY( p1.use_count() == 1 );
  68   VERIFY( p2.use_count() == 1 );
  69
  70   return 0;
  71 }
  72
  73
  74 int
  75 main()
  76 {
  77   test01();
  78   test02();
  79   test03();
  80   return 0;
  81 }