libstdc++-v3/testsuite/20_util/optional/typedefs.cc

   1 // { dg-do compile { target c++17 }  }
   2
   3 // Copyright (C) 2014-2022 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 <optional>
  21 #include <type_traits>
  22 #include <stdexcept>
  23
  24 template<typename T>
  25   using check1_t = std::optional<T>;
  26
  27 using check2_t = std::in_place_t;
  28 using check3_t = std::nullopt_t;
  29 using check4_t = std::bad_optional_access;
  30
  31 static_assert(!std::is_base_of<std::logic_error, check4_t>::value,
  32               "bad_optional_access must derive from exception");
  33 static_assert(std::is_base_of<std::exception, check4_t>::value,
  34               "bad_optional_access must derive from exception");