libstdc++-v3/testsuite/20_util/enable_shared_from_this/members/const.cc

   1 // Copyright (C) 2015-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <memory>
  21 #include <testsuite_hooks.h>
  22
  23 template<typename T, typename U>
  24   bool
  25   share_ownership(const std::shared_ptr<T>& p1, const std::shared_ptr<U>& p2)
  26   {
  27     return !p1.owner_before(p2) && !p2.owner_before(p1);
  28   }
  29
  30 void
  31 test01()
  32 {
  33   struct X : public std::enable_shared_from_this<X> { };
  34   using CX = const X;
  35   std::shared_ptr<CX> p(new CX);
  36   VERIFY( share_ownership(p->shared_from_this(), p) );
  37   p.reset(new X);
  38   VERIFY( share_ownership(p->shared_from_this(), p) );
  39   auto p2 = std::const_pointer_cast<X>(p)->shared_from_this();
  40   VERIFY( share_ownership(p2, p) );
  41 }
  42
  43 void
  44 test02()
  45 {
  46   struct X;
  47   using CX = const X;
  48   struct X : public std::enable_shared_from_this<CX> { };
  49   std::shared_ptr<CX> p(new X);
  50   VERIFY( share_ownership(p->shared_from_this(), p) );
  51   p.reset(new CX);
  52   VERIFY( share_ownership(p->shared_from_this(), p) );
  53 }
  54
  55 int
  56 main()
  57 {
  58   test01();
  59   test02();
  60 }