libstdc++-v3/testsuite/experimental/optional/constexpr/cons/default.cc

   1 // { dg-do compile { target c++14 } }
   2
   3 // Copyright (C) 2013-2021 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/optional>
  21 #include <testsuite_hooks.h>
  22
  23 int main()
  24 {
  25   // [20.5.4.1] Constructors
  26
  27   {
  28     constexpr std::experimental::optional<int> o;
  29     static_assert( !o, "" );
  30   }
  31
  32   {
  33     constexpr std::experimental::optional<int> o {};
  34     static_assert( !o, "" );
  35   }
  36
  37   {
  38     constexpr std::experimental::optional<int> o = {};
  39     static_assert( !o, "" );
  40   }
  41 }