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

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2013-2017 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 #include <string>
  25 #include <memory>
  26
  27 int main()
  28 {
  29   {
  30     struct X
  31     {
  32       explicit X(int) {}
  33     };
  34     std::optional<X> ox{42};
  35     std::optional<X> ox2 = 42; // { dg-error "conversion" }
  36     std::optional<std::unique_ptr<int>> oup{new int};
  37     std::optional<std::unique_ptr<int>> oup2 = new int;  // { dg-error "conversion" }
  38     struct U { explicit U(std::in_place_t); };
  39     std::optional<U> ou(std::in_place); // { dg-error "no matching" }
  40     // { dg-error "no type" "" { target { *-*-* } } 495 }
  41     // { dg-error "no type" "" { target { *-*-* } } 505 }
  42     // { dg-error "no type" "" { target { *-*-* } } 562 }
  43   }
  44 }