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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2007-2024 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 <utility>
  25 #include <testsuite_hooks.h>
  26
  27 struct A
  28 {
  29   A() { ++ctor_count; }
  30   virtual ~A() { ++dtor_count; }
  31   static long ctor_count;
  32   static long dtor_count;
  33 };
  34 long A::ctor_count = 0;
  35 long A::dtor_count = 0;
  36
  37 struct B : A
  38 {
  39   B() { ++ctor_count; }
  40   virtual ~B() { ++dtor_count; }
  41   static long ctor_count;
  42   static long dtor_count;
  43 };
  44 long B::ctor_count = 0;
  45 long B::dtor_count = 0;
  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 // 20.6.6.2.1 shared_ptr constructors [util.smartptr.shared.const]
  60
  61 // Rvalue assignment from shared_ptr
  62 void
  63 test01()
  64 {
  65   reset_count_struct __attribute__((unused)) reset;
  66
  67   std::shared_ptr<A> a1;
  68   std::shared_ptr<A> a2(new A);
  69
  70   a1 = std::move(a2);
  71   VERIFY( a1.get() != 0 );
  72   VERIFY( a2.get() == 0 );
  73   VERIFY( a1.use_count() == 1 );
  74   VERIFY( a2.use_count() == 0 );
  75   VERIFY( A::ctor_count == 1 );
  76   VERIFY( A::dtor_count == 0 );
  77
  78   a1 = std::move(std::shared_ptr<A>());
  79   VERIFY( a1.get() == 0 );
  80   VERIFY( A::ctor_count == 1 );
  81   VERIFY( A::dtor_count == 1 );
  82 }
  83
  84 // Rvalue assignment from shared_ptr<Y>
  85 void
  86 test02()
  87 {
  88   reset_count_struct __attribute__((unused)) reset;
  89
  90   std::shared_ptr<A> a;
  91   std::shared_ptr<B> b(new B);
  92
  93   a = std::move(b);
  94   VERIFY( a.get() != 0 );
  95   VERIFY( b.get() == 0 );
  96   VERIFY( a.use_count() == 1 );
  97   VERIFY( b.use_count() == 0 );
  98   VERIFY( A::ctor_count == 1 );
  99   VERIFY( A::dtor_count == 0 );
 100   VERIFY( B::ctor_count == 1 );
 101   VERIFY( B::dtor_count == 0 );
 102
 103   a = std::move(std::shared_ptr<A>());
 104   VERIFY( a.get() == 0 );
 105   VERIFY( A::ctor_count == 1 );
 106   VERIFY( A::dtor_count == 1 );
 107   VERIFY( B::ctor_count == 1 );
 108   VERIFY( B::dtor_count == 1 );
 109 }
 110
 111 int
 112 main()
 113 {
 114   test01();
 115   test02();
 116   return 0;
 117 }