libstdc++-v3/testsuite/experimental/memory/shared_ptr/cons/alias_ctor.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2018 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 // 8.2.1 Class template shared_ptr [memory.smartptr.shared]
  21
  22 #include <experimental/memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A
  26 {
  27   A() : i() { }
  28   virtual ~A() { }
  29   int i;
  30 };
  31
  32 struct B : A
  33 {
  34   B() : A(), a() { }
  35   virtual ~B() { }
  36   A a;
  37 };
  38
  39 // 8.2.1.1 shared_ptr constructors [memory.smartptr.shared.const]
  40
  41 // Aliasing constructors
  42
  43 void
  44 test01()
  45 {
  46   bool test = true;
  47
  48   std::experimental::shared_ptr<A[5]> a;
  49   std::experimental::shared_ptr<bool> b1(a, &test);
  50   VERIFY( b1.use_count() == 0 );
  51   VERIFY( a.get() == 0 );
  52   VERIFY( b1.get() == &test );
  53
  54   std::experimental::shared_ptr<bool> b2(b1);
  55   VERIFY( b2.use_count() == 0 );
  56   VERIFY( b1.get() == b2.get() );
  57 }
  58
  59 void
  60 test02()
  61 {
  62   std::experimental::shared_ptr<A[5]> a(new A[5]);
  63   std::experimental::shared_ptr<int> i1(a, &a[0].i);
  64   VERIFY( i1.use_count() == 2 );
  65
  66   std::experimental::shared_ptr<int> i2(i1);
  67   VERIFY( i2.use_count() == 3 );
  68   VERIFY( i2.get() == &a[0].i );
  69 }
  70
  71 void
  72 test03()
  73 {
  74   std::experimental::shared_ptr<B> b(new B);
  75   std::experimental::shared_ptr<A> a1(b, b.get());
  76   std::experimental::shared_ptr<A> a2(b, &b->a);
  77   VERIFY( a2.use_count() == 3 );
  78   VERIFY( a1 == b );
  79   VERIFY( a2 != b );
  80   VERIFY( a1.get() != a2.get() );
  81
  82   std::experimental::shared_ptr<A> a3(a1);
  83   VERIFY( a3 == b );
  84
  85   a3 = a2;
  86   VERIFY( a3.get() == &b->a );
  87 }
  88
  89 int
  90 main()
  91 {
  92   test01();
  93   test02();
  94   test03();
  95   return 0;
  96 }