libstdc++-v3/testsuite/20_util/shared_ptr/cons/nullptr.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2010-2022 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 20.9.11.2 Class template shared_ptr [util.smartptr.shared]
  22
  23 #include <memory>
  24 #include <cstddef>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_allocator.h>
  27
  28 // 20.9.11.2.1 shared_ptr constructors [util.smartptr.shared.const]
  29
  30 // Construction from nullptr
  31
  32 struct deleter
  33 {
  34   int count;
  35   deleter() : count(0) { }
  36   void operator()(std::nullptr_t) { ++count; }
  37   void operator()(int*) const { throw "wrong type passed to deleter"; }
  38 };
  39
  40 void
  41 test01()
  42 {
  43   std::shared_ptr<int> p = nullptr;
  44   VERIFY( p.get() == nullptr );
  45   VERIFY( p.use_count() == 0 );
  46
  47 }
  48
  49 void
  50 test02()
  51 {
  52   deleter d;
  53   std::shared_ptr<int> p(nullptr, std::ref(d));
  54   VERIFY( p.get() == nullptr );
  55   VERIFY( p.use_count() == 1 );
  56
  57   p = nullptr;
  58   VERIFY( p.use_count() == 0 );
  59   VERIFY( d.count == 1 );
  60 }
  61
  62
  63 void
  64 test03()
  65 {
  66   deleter d;
  67   __gnu_test::tracker_allocator<int> a;
  68   std::shared_ptr<int> p(nullptr, std::ref(d), a);
  69   VERIFY( p.get() == nullptr );
  70   VERIFY( p.use_count() == 1 );
  71
  72   p = nullptr;
  73   VERIFY( p.use_count() == 0 );
  74   VERIFY( d.count == 1 );
  75
  76   typedef __gnu_test::tracker_allocator_counter c;
  77   VERIFY( c::get_destruct_count() == c::get_construct_count() );
  78   VERIFY( c::get_deallocation_count() == c::get_allocation_count() );
  79 }
  80
  81 int
  82 main()
  83 {
  84   test01();
  85   test02();
  86   test03();
  87   return 0;
  88 }