libstdc++-v3/testsuite/tr1/2_general_utilities/memory/shared_ptr/observers/use_count.cc

   1 // Copyright (C) 2005 Free Software Foundation
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // TR1 2.2.2 Template class shared_ptr [tr.util.smartptr.shared]
  20
  21 #include <tr1/memory>
  22 #include <testsuite_hooks.h>
  23
  24 struct A { };
  25 struct B : A { };
  26
  27 // 2.2.3.5 shared_ptr observers [tr.util.smartptr.shared.obs]
  28
  29 // use_count
  30 int
  31 test01()
  32 {
  33   bool test __attribute__((unused)) = true;
  34
  35   const std::tr1::shared_ptr<A> p1;
  36   VERIFY( p1.use_count() == 0 );
  37   const std::tr1::shared_ptr<A> p2(p1);
  38   VERIFY( p1.use_count() == 0 );
  39
  40   return 0;
  41 }
  42
  43 int
  44 test02()
  45 {
  46   bool test __attribute__((unused)) = true;
  47
  48   std::tr1::shared_ptr<A> p1(new A);
  49   std::tr1::shared_ptr<A> p2(p1);
  50   p1.reset();
  51   VERIFY( p1.use_count() == 0 );
  52   VERIFY( p2.use_count() == 1 );
  53
  54   return 0;
  55 }
  56
  57 int
  58 test03()
  59 {
  60   bool test __attribute__((unused)) = true;
  61
  62   std::tr1::shared_ptr<A> p1(new A);
  63   std::tr1::shared_ptr<A> p2(p1);
  64   p2.reset(new B);
  65   VERIFY( p1.use_count() == 1 );
  66   VERIFY( p2.use_count() == 1 );
  67
  68   return 0;
  69 }
  70
  71
  72 int
  73 main()
  74 {
  75   test01();
  76   test02();
  77   test03();
  78   return 0;
  79 }