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

   1 // Copyright (C) 2016-2022 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++14 } }
  19
  20 #include <experimental/memory>
  21 #include <testsuite_hooks.h>
  22
  23 struct A : std::enable_shared_from_this<A> { };
  24 struct B : std::experimental::enable_shared_from_this<B> { };
  25 struct C : A, B { };
  26
  27 void
  28 test01()
  29 {
  30   // This should not fail to compile due to ambiguous base classes:
  31   std::experimental::shared_ptr<C> p(new C);
  32
  33   // And both base classes should have been enabled:
  34   std::shared_ptr<A> pa = p->A::shared_from_this();
  35   VERIFY( pa != nullptr );
  36   // Can't compare pa and p because they're different types
  37
  38   std::experimental::shared_ptr<B> pb = p->B::shared_from_this();
  39   VERIFY( pb != nullptr );
  40   VERIFY( pb == p );
  41 }
  42
  43 int
  44 main()
  45 {
  46   test01();
  47 }