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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2010-2020 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 // 20.9.11.2 Class template shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <cstddef>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_allocator.h>
  26
  27 // 20.9.11.2.1 shared_ptr constructors [util.smartptr.shared.const]
  28
  29 // Construction from nullptr
  30
  31 struct deleter
  32 {
  33   int count;
  34   deleter() : count(0) { }
  35   void operator()(std::nullptr_t) { ++count; }
  36   void operator()(int*) const { throw "wrong type passed to deleter"; }
  37 };
  38
  39 void
  40 test01()
  41 {
  42   std::shared_ptr<int> p = nullptr;
  43   VERIFY( p.get() == nullptr );
  44   VERIFY( p.use_count() == 0 );
  45
  46 }
  47
  48 void
  49 test02()
  50 {
  51   deleter d;
  52   std::shared_ptr<int> p(nullptr, std::ref(d));
  53   VERIFY( p.get() == nullptr );
  54   VERIFY( p.use_count() == 1 );
  55
  56   p = nullptr;
  57   VERIFY( p.use_count() == 0 );
  58   VERIFY( d.count == 1 );
  59 }
  60
  61
  62 void
  63 test03()
  64 {
  65   deleter d;
  66   __gnu_test::tracker_allocator<int> a;
  67   std::shared_ptr<int> p(nullptr, std::ref(d), a);
  68   VERIFY( p.get() == nullptr );
  69   VERIFY( p.use_count() == 1 );
  70
  71   p = nullptr;
  72   VERIFY( p.use_count() == 0 );
  73   VERIFY( d.count == 1 );
  74
  75   typedef __gnu_test::tracker_allocator_counter c;
  76   VERIFY( c::get_destruct_count() == c::get_construct_count() );
  77   VERIFY( c::get_deallocation_count() == c::get_allocation_count() );
  78 }
  79
  80 int
  81 main()
  82 {
  83   test01();
  84   test02();
  85   test03();
  86   return 0;
  87 }