libstdc++-v3/testsuite/experimental/optional/cons/default.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2013-2020 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 <experimental/optional>
  21 #include <testsuite_hooks.h>
  22
  23 struct tracker
  24 {
  25   tracker() { ++count; }
  26   ~tracker() { --count; }
  27
  28   tracker(tracker const&) { ++count; }
  29   tracker(tracker&&) { ++count; }
  30
  31   tracker& operator=(tracker const&) = default;
  32   tracker& operator=(tracker&&) = default;
  33
  34   static int count;
  35 };
  36
  37 int tracker::count = 0;
  38
  39 int main()
  40 {
  41   // [20.5.4.1] Constructors
  42
  43   {
  44     std::experimental::optional<tracker> o;
  45     VERIFY( !o );
  46   }
  47
  48   {
  49     std::experimental::optional<tracker> o {};
  50     VERIFY( !o );
  51   }
  52
  53   {
  54     std::experimental::optional<tracker> o = {};
  55     VERIFY( !o );
  56   }
  57
  58   VERIFY( tracker::count == 0 );
  59 }