libstdc++-v3/testsuite/experimental/optional/constexpr/make_optional.cc

   1 // { dg-options "-std=gnu++1y" }
   2 // XFAIL pending resolution of PR libstdc++/58777
   3 // { dg-do compile { xfail *-*-* } }
   4 // { dg-excess-errors "" }
   5
   6 // Copyright (C) 2013 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a moved_to of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <experimental/optional>
  24 #include <testsuite_hooks.h>
  25
  26 int main()
  27 {
  28   constexpr int i = 42;
  29   constexpr auto o = std::experimental::make_optional(i);
  30   static_assert( std::is_same<decltype(o), const std::experimental::optional<int>>(), "" );
  31   static_assert( o && *o == 42, "" );
  32   static_assert( &*o != &i, "" );
  33 }