libstdc++-v3/testsuite/20_util/optional/cons/value_neg.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 }  }
   3
   4 // Copyright (C) 2013-2021 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 <string>
  23 #include <memory>
  24
  25 int main()
  26 {
  27   {
  28     struct X
  29     {
  30       explicit X(int) {}
  31     };
  32     std::optional<X> ox{42};
  33     std::optional<X> ox2 = 42; // { dg-error "conversion" }
  34     std::optional<std::unique_ptr<int>> oup{new int};
  35     std::optional<std::unique_ptr<int>> oup2 = new int;  // { dg-error "conversion" }
  36     struct U { explicit U(std::in_place_t); };
  37     std::optional<U> ou(std::in_place); // { dg-error "no matching" }
  38   }
  39 }
  40 // { dg-prune-output "no type .*enable_if" }