libstdc++-v3/testsuite/20_util/shared_ptr/observers/owner_before.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2008-2020 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 // 20.8.13.2 Template class shared_ptr [util.smartptr.shared]
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 struct A
  26 {
  27   int i;
  28   virtual ~A() { }
  29 };
  30
  31 struct B : A
  32 {
  33 };
  34
  35 // 20.6.6.2.5 shared_ptr observers [util.smartptr.shared.obs]
  36
  37 void
  38 test01()
  39 {
  40   // test empty shared_ptrs compare equivalent
  41   std::shared_ptr<A> p1;
  42   std::shared_ptr<B> p2;
  43   VERIFY( !p1.owner_before(p2) && !p2.owner_before(p1) );
  44 }
  45
  46
  47 // Construction from pointer
  48 void
  49 test02()
  50 {
  51   std::shared_ptr<A> a0;
  52
  53   std::shared_ptr<A> a1(new A);
  54   VERIFY( a1.owner_before(a0) || a0.owner_before(a1) );
  55   VERIFY( !(a1.owner_before(a0) && a0.owner_before(a1)) );
  56
  57   std::shared_ptr<B> b1(new B);
  58   VERIFY( a1.owner_before(b1) || b1.owner_before(a1) );
  59   VERIFY( !(a1.owner_before(b1) && b1.owner_before(a1)) );
  60
  61   std::shared_ptr<A> a2(a1);
  62   VERIFY( !a1.owner_before(a2) && !a2.owner_before(a1) );
  63   a2 = b1;
  64   VERIFY( !b1.owner_before(a2) && !a2.owner_before(b1) );
  65
  66   std::weak_ptr<A> w1(a1);
  67   VERIFY( !a1.owner_before(w1) && !w1.owner_before(a1) );
  68   std::weak_ptr<A> w2(a2);
  69   VERIFY( !b1.owner_before(w2) && !w2.owner_before(b1) );
  70
  71   static_assert( noexcept(a1.owner_before(a0)), "" );
  72   static_assert( noexcept(a1.owner_before(b1)), "" );
  73   static_assert( noexcept(b1.owner_before(a1)), "" );
  74   static_assert( noexcept(a1.owner_before(w1)), "" );
  75   static_assert( noexcept(b1.owner_before(w1)), "" );
  76 }
  77
  78 // Aliasing
  79 void
  80 test03()
  81 {
  82   std::shared_ptr<A> p1(new A());
  83   std::shared_ptr<int> p2(p1, &p1->i);
  84   VERIFY( !p1.owner_before(p2) && !p2.owner_before(p1) );
  85 }
  86
  87 int
  88 main()
  89 {
  90   test01();
  91   test02();
  92   test03();
  93   return 0;
  94 }