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

   1 // { dg-options "-std=gnu++1y" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2013-2014 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 <experimental/optional>
  22 #include <testsuite_hooks.h>
  23
  24 struct tracker
  25 {
  26   tracker() { ++count; }
  27   ~tracker() { --count; }
  28
  29   tracker(tracker const&) { ++count; }
  30   tracker(tracker&&) { ++count; }
  31
  32   tracker& operator=(tracker const&) = default;
  33   tracker& operator=(tracker&&) = default;
  34
  35   static int count;
  36 };
  37
  38 int tracker::count = 0;
  39
  40 int main()
  41 {
  42   // [20.5.4.1] Constructors
  43
  44   {
  45     std::experimental::optional<tracker> o;
  46     VERIFY( !o );
  47   }
  48
  49   {
  50     std::experimental::optional<tracker> o {};
  51     VERIFY( !o );
  52   }
  53
  54   {
  55     std::experimental::optional<tracker> o = {};
  56     VERIFY( !o );
  57   }
  58
  59   VERIFY( tracker::count == 0 );
  60 }