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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2007-2020 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 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <utility>
  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 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 // 20.6.6.2.1 shared_ptr constructors [util.smartptr.shared.const]
  59
  60 // Rvalue assignment from shared_ptr
  61 void
  62 test01()
  63 {
  64   reset_count_struct __attribute__((unused)) reset;
  65
  66   std::shared_ptr<A> a1;
  67   std::shared_ptr<A> a2(new A);
  68
  69   a1 = std::move(a2);
  70   VERIFY( a1.get() != 0 );
  71   VERIFY( a2.get() == 0 );
  72   VERIFY( a1.use_count() == 1 );
  73   VERIFY( a2.use_count() == 0 );
  74   VERIFY( A::ctor_count == 1 );
  75   VERIFY( A::dtor_count == 0 );
  76
  77   a1 = std::move(std::shared_ptr<A>());
  78   VERIFY( a1.get() == 0 );
  79   VERIFY( A::ctor_count == 1 );
  80   VERIFY( A::dtor_count == 1 );
  81 }
  82
  83 // Rvalue assignment from shared_ptr<Y>
  84 void
  85 test02()
  86 {
  87   reset_count_struct __attribute__((unused)) reset;
  88
  89   std::shared_ptr<A> a;
  90   std::shared_ptr<B> b(new B);
  91
  92   a = std::move(b);
  93   VERIFY( a.get() != 0 );
  94   VERIFY( b.get() == 0 );
  95   VERIFY( a.use_count() == 1 );
  96   VERIFY( b.use_count() == 0 );
  97   VERIFY( A::ctor_count == 1 );
  98   VERIFY( A::dtor_count == 0 );
  99   VERIFY( B::ctor_count == 1 );
 100   VERIFY( B::dtor_count == 0 );
 101
 102   a = std::move(std::shared_ptr<A>());
 103   VERIFY( a.get() == 0 );
 104   VERIFY( A::ctor_count == 1 );
 105   VERIFY( A::dtor_count == 1 );
 106   VERIFY( B::ctor_count == 1 );
 107   VERIFY( B::dtor_count == 1 );
 108 }
 109
 110 int
 111 main()
 112 {
 113   test01();
 114   test02();
 115   return 0;
 116 }