libstdc++-v3/testsuite/20_util/shared_ptr/cons/alias.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2007 Free Software Foundation
   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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  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() : i() { }
  29   virtual ~A() { }
  30   int i;
  31 };
  32
  33 struct B : A
  34 {
  35   B() : A(), a() { }
  36   virtual ~B() { }
  37   A a;
  38 };
  39
  40 void deletefunc(A* p) { delete p; }
  41
  42 // 20.6.6.2.1 shared_ptr constructors [util.smartptr.shared.const]
  43
  44 // Aliasing constructors
  45
  46 int test01()
  47 {
  48   bool test __attribute__((unused)) = true;
  49
  50   std::shared_ptr<A> a;
  51   std::shared_ptr<bool> b1(a, &test);
  52   VERIFY( b1.use_count() == 0 );
  53   VERIFY( a.get() == 0 );
  54   VERIFY( b1.get() == &test );
  55
  56   std::shared_ptr<bool> b2(b1);
  57   VERIFY( b2.use_count() == 0 );
  58   VERIFY( b1.get() == b2.get() );
  59
  60   return 0;
  61 }
  62
  63 int
  64 test02()
  65 {
  66   bool test __attribute__((unused)) = true;
  67
  68   std::shared_ptr<A> a(new A);
  69   std::shared_ptr<int> i1(a, &a->i);
  70   VERIFY( i1.use_count() == 2 );
  71
  72   std::shared_ptr<int> i2(i1);
  73   VERIFY( i2.use_count() == 3 );
  74   VERIFY( i2.get() == &a->i );
  75
  76   return 0;
  77 }
  78
  79 int
  80 test03()
  81 {
  82   bool test __attribute__((unused)) = true;
  83
  84   std::shared_ptr<B> b(new B);
  85   std::shared_ptr<A> a1(b, b.get());
  86   std::shared_ptr<A> a2(b, &b->a);
  87   VERIFY( a2.use_count() == 3 );
  88   VERIFY( a1 == b );
  89   VERIFY( a2 != b );
  90   VERIFY( a1.get() != a2.get() );
  91
  92   std::shared_ptr<A> a3(a1);
  93   VERIFY( a3 == b );
  94
  95   a3 = a2;
  96   VERIFY( a3.get() == &b->a );
  97
  98   return 0;
  99 }
 100
 101 int
 102 main()
 103 {
 104   test01();
 105   test02();
 106   test03();
 107   return 0;
 108 }