libstdc++-v3/testsuite/20_util/optional/cons/77727.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 }  }
   3
   4 // Copyright (C) 2016-2020 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
  25 struct NonTransferable
  26 {
  27   int x;
  28   NonTransferable(int x) : x(x) {}
  29   NonTransferable(NonTransferable&&) = delete;
  30   NonTransferable& operator=(NonTransferable&&) = delete;
  31   operator int() {return x;}
  32 };
  33
  34 int main()
  35 {
  36   std::optional<int> oi;
  37   std::optional<NonTransferable> ot(std::move(oi));
  38   VERIFY(!ot);
  39
  40   std::optional<int> oi2;
  41   std::optional<NonTransferable> ot2(oi2);
  42   VERIFY(!ot);
  43
  44   std::optional<int> oi3{42};
  45   std::optional<NonTransferable> ot3(std::move(oi3));
  46   VERIFY(ot3 && *ot3 == 42);
  47
  48   std::optional<int> oi4{666};
  49   std::optional<NonTransferable> ot4(oi4);
  50   VERIFY(ot4 && *ot4 == 666);
  51 }