libstdc++-v3/testsuite/experimental/memory/observer_ptr/make_observer.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2022 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 #include <experimental/memory>
  21 #include <testsuite_hooks.h>
  22
  23 int main()
  24 {
  25   const int i = 42;
  26   auto o = std::experimental::make_observer(&i);
  27   static_assert( std::is_same<decltype(o),
  28                  std::experimental::observer_ptr<const int>>(), "" );
  29   VERIFY( o && *o == 42 );
  30   VERIFY( o.get() == &i );
  31 }