libstdc++-v3/testsuite/20_util/any/modifiers/1.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2014-2020 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 <any>
  22 #include <testsuite_hooks.h>
  23
  24 using std::any;
  25
  26 void test01()
  27 {
  28   any x(1);
  29   any y;
  30   x.swap(y);
  31   VERIFY( !x.has_value() );
  32   VERIFY( y.has_value() );
  33   x.swap(y);
  34   VERIFY( x.has_value() );
  35   VERIFY( !y.has_value() );
  36
  37   x.reset();
  38   VERIFY( !x.has_value() );
  39 }
  40
  41 int main()
  42 {
  43   test01();
  44 }