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

   1 // Copyright (C) 2005-2016 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // TR1 2.2.2 Template class shared_ptr [tr.util.smartptr.shared]
  19
  20 #include <tr1/memory>
  21 #include <testsuite_hooks.h>
  22
  23 struct A { };
  24 struct B : A { };
  25
  26 // 2.2.3.5 shared_ptr observers [tr.util.smartptr.shared.obs]
  27
  28 // use_count
  29 int
  30 test01()
  31 {
  32   bool test __attribute__((unused)) = true;
  33
  34   const std::tr1::shared_ptr<A> p1;
  35   VERIFY( p1.use_count() == 0 );
  36   const std::tr1::shared_ptr<A> p2(p1);
  37   VERIFY( p1.use_count() == 0 );
  38
  39   return 0;
  40 }
  41
  42 int
  43 test02()
  44 {
  45   bool test __attribute__((unused)) = true;
  46
  47   std::tr1::shared_ptr<A> p1(new A);
  48   std::tr1::shared_ptr<A> p2(p1);
  49   p1.reset();
  50   VERIFY( p1.use_count() == 0 );
  51   VERIFY( p2.use_count() == 1 );
  52
  53   return 0;
  54 }
  55
  56 int
  57 test03()
  58 {
  59   bool test __attribute__((unused)) = true;
  60
  61   std::tr1::shared_ptr<A> p1(new A);
  62   std::tr1::shared_ptr<A> p2(p1);
  63   p2.reset(new B);
  64   VERIFY( p1.use_count() == 1 );
  65   VERIFY( p2.use_count() == 1 );
  66
  67   return 0;
  68 }
  69
  70
  71 int
  72 main()
  73 {
  74   test01();
  75   test02();
  76   test03();
  77   return 0;
  78 }