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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2005-2024 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   virtual ~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   virtual ~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
  47 struct reset_count_struct
  48 {
  49   ~reset_count_struct()
  50   {
  51     A::ctor_count = 0;
  52     A::dtor_count = 0;
  53     B::ctor_count = 0;
  54     B::dtor_count = 0;
  55   }
  56 };
  57
  58
  59 // 20.6.6.2.3 shared_ptr assignment [util.smartptr.shared.assign]
  60
  61 // Assignment from shared_ptr<Y>
  62 void
  63 test01()
  64 {
  65   reset_count_struct __attribute__((unused)) reset;
  66
  67   std::shared_ptr<A> a;
  68
  69   a = std::shared_ptr<A>();
  70   VERIFY( a.get() == 0 );
  71   VERIFY( A::ctor_count == 0 );
  72   VERIFY( A::dtor_count == 0 );
  73   VERIFY( B::ctor_count == 0 );
  74   VERIFY( B::dtor_count == 0 );
  75
  76   a = std::shared_ptr<A>(new A);
  77   VERIFY( a.get() != 0 );
  78   VERIFY( A::ctor_count == 1 );
  79   VERIFY( A::dtor_count == 0 );
  80   VERIFY( B::ctor_count == 0 );
  81   VERIFY( B::dtor_count == 0 );
  82
  83   a = std::shared_ptr<B>(new B);
  84   VERIFY( a.get() != 0 );
  85   VERIFY( A::ctor_count == 2 );
  86   VERIFY( A::dtor_count == 1 );
  87   VERIFY( B::ctor_count == 1 );
  88   VERIFY( B::dtor_count == 0 );
  89 }
  90
  91 int
  92 main()
  93 {
  94   test01();
  95   return 0;
  96 }