libstdc++-v3/testsuite/20_util/shared_ptr/dest/dest.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2005-2023 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 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  22
  23 #include <memory>
  24 #include <testsuite_hooks.h>
  25
  26 struct A
  27 {
  28   A() { ++ctor_count; }
  29   ~A() { ++dtor_count; }
  30   static long ctor_count;
  31   static long dtor_count;
  32 };
  33 long A::ctor_count = 0;
  34 long A::dtor_count = 0;
  35
  36 struct B : A
  37 {
  38   B() { ++ctor_count; }
  39   ~B() { ++dtor_count; }
  40   static long ctor_count;
  41   static long dtor_count;
  42 };
  43 long B::ctor_count = 0;
  44 long B::dtor_count = 0;
  45
  46 struct D
  47 {
  48   void operator()(const B* p) { delete p; ++delete_count; }
  49   static long delete_count;
  50 };
  51 long D::delete_count = 0;
  52
  53 struct reset_count_struct
  54 {
  55   ~reset_count_struct()
  56   {
  57     A::ctor_count = 0;
  58     A::dtor_count = 0;
  59     B::ctor_count = 0;
  60     B::dtor_count = 0;
  61     D::delete_count = 0;
  62   }
  63 };
  64
  65
  66 // 20.6.6.2.2 shared_ptr destructor [util.smartptr.shared.dest]
  67
  68 // empty shared_ptr
  69 int
  70 test01()
  71 {
  72   reset_count_struct __attribute__((unused)) reset;
  73
  74   {
  75     std::shared_ptr<A> a;
  76   }
  77   VERIFY( A::ctor_count == 0 );
  78   VERIFY( A::dtor_count == 0 );
  79   VERIFY( B::ctor_count == 0 );
  80   VERIFY( B::dtor_count == 0 );
  81   VERIFY( D::delete_count == 0 );
  82
  83   return 0;
  84 }
  85
  86 // shared ownership
  87 int
  88 test02()
  89 {
  90   reset_count_struct __attribute__((unused)) reset;
  91
  92   std::shared_ptr<A> a;
  93   {
  94     a = std::shared_ptr<A>(new B, D());
  95   }
  96   VERIFY( A::ctor_count == 1 );
  97   VERIFY( A::dtor_count == 0 );
  98   VERIFY( B::ctor_count == 1 );
  99   VERIFY( B::dtor_count == 0 );
 100   VERIFY( D::delete_count == 0 );
 101
 102   return 0;
 103 }
 104
 105 // exclusive ownership
 106 int
 107 test03()
 108 {
 109   reset_count_struct __attribute__((unused)) reset;
 110
 111   {
 112     std::shared_ptr<A> a1(new B);
 113     std::shared_ptr<A> a2(new B, D());
 114   }
 115   VERIFY( A::ctor_count == 2 );
 116   VERIFY( A::dtor_count == 2 );
 117   VERIFY( B::ctor_count == 2 );
 118   VERIFY( B::dtor_count == 2 );
 119   VERIFY( D::delete_count == 1 );
 120
 121   return 0;
 122 }
 123
 124
 125 int
 126 main()
 127 {
 128   test01();
 129   test02();
 130   test03();
 131   return 0;
 132 }