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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2005-2021 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 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A
  26 {
  27   A() { ++ctor_count; }
  28   virtual ~A() { ++dtor_count; }
  29   static long ctor_count;
  30   static long dtor_count;
  31 };
  32 long A::ctor_count = 0;
  33 long A::dtor_count = 0;
  34
  35 struct B : A
  36 {
  37   B() { ++ctor_count; }
  38   virtual ~B() { ++dtor_count; }
  39   static long ctor_count;
  40   static long dtor_count;
  41 };
  42 long B::ctor_count = 0;
  43 long B::dtor_count = 0;
  44
  45
  46 struct reset_count_struct
  47 {
  48   ~reset_count_struct()
  49   {
  50     A::ctor_count = 0;
  51     A::dtor_count = 0;
  52     B::ctor_count = 0;
  53     B::dtor_count = 0;
  54   }
  55 };
  56
  57
  58 // 20.6.6.2.3 shared_ptr assignment [util.smartptr.shared.assign]
  59
  60 // Assignment from shared_ptr<Y>
  61 void
  62 test01()
  63 {
  64   reset_count_struct __attribute__((unused)) reset;
  65
  66   std::shared_ptr<A> a;
  67
  68   a = std::shared_ptr<A>();
  69   VERIFY( a.get() == 0 );
  70   VERIFY( A::ctor_count == 0 );
  71   VERIFY( A::dtor_count == 0 );
  72   VERIFY( B::ctor_count == 0 );
  73   VERIFY( B::dtor_count == 0 );
  74
  75   a = std::shared_ptr<A>(new A);
  76   VERIFY( a.get() != 0 );
  77   VERIFY( A::ctor_count == 1 );
  78   VERIFY( A::dtor_count == 0 );
  79   VERIFY( B::ctor_count == 0 );
  80   VERIFY( B::dtor_count == 0 );
  81
  82   a = std::shared_ptr<B>(new B);
  83   VERIFY( a.get() != 0 );
  84   VERIFY( A::ctor_count == 2 );
  85   VERIFY( A::dtor_count == 1 );
  86   VERIFY( B::ctor_count == 1 );
  87   VERIFY( B::dtor_count == 0 );
  88 }
  89
  90 int
  91 main()
  92 {
  93   test01();
  94   return 0;
  95 }