libstdc++-v3/testsuite/20_util/optional/observers/2.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 }  }
   3
   4 // Copyright (C) 2013-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <optional>
  22 #include <testsuite_hooks.h>
  23
  24 struct value_type
  25 {
  26   int i;
  27 };
  28
  29 void* operator&(const value_type&) = delete;
  30
  31 int main()
  32 {
  33   std::optional<value_type> o { value_type { 51 } };
  34   VERIFY( o->i == 51 );
  35   VERIFY( o->i == (*o).i );
  36   VERIFY( &o->i == &(*o).i );
  37 }