libstdc++-v3/testsuite/experimental/memory/shared_ptr/observers/use_count.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2020 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 // 8.2.1 Class template shared_ptr [memory.smartptr.shared]
  21
  22 #include <experimental/memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A { };
  26
  27 // 8.2.1.2 shared_ptr observers [memory.smartptr.shared.obs]
  28
  29 // use_count
  30 void
  31 test01()
  32 {
  33   const std::experimental::shared_ptr<A[5]> p1;
  34   VERIFY( p1.use_count() == 0 );
  35   const std::experimental::shared_ptr<A[5]> p2(p1);
  36   VERIFY( p1.use_count() == 0 );
  37 }
  38
  39 void
  40 test02()
  41 {
  42   std::experimental::shared_ptr<A[5]> p1(new A[5]);
  43   std::experimental::shared_ptr<A[5]> p2(p1);
  44   p1.reset();
  45   VERIFY( p1.use_count() == 0 );
  46   VERIFY( p2.use_count() == 1 );
  47 }
  48
  49 void
  50 test03()
  51 {
  52   std::experimental::shared_ptr<A[5]> p1(new A[5]);
  53   std::experimental::shared_ptr<A[5]> p2(p1);
  54   p2.reset(new A[5]);
  55   VERIFY( p1.use_count() == 1 );
  56   VERIFY( p2.use_count() == 1 );
  57 }
  58
  59 int
  60 main()
  61 {
  62   test01();
  63   test02();
  64   test03();
  65   return 0;
  66 }