libstdc++-v3/testsuite/30_threads/packaged_task/members/reset2.cc

   1 // { dg-do run }
   2 // { dg-options "-pthread"  }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-effective-target pthread }
   5 // { dg-require-gthreads "" }
   6
   7 // Copyright (C) 2009-2019 Free Software Foundation, Inc.
   8 //
   9 // This file is part of the GNU ISO C++ Library.  This library is free
  10 // software; you can redistribute it and/or modify it under the
  11 // terms of the GNU General Public License as published by the
  12 // Free Software Foundation; either version 3, or (at your option)
  13 // any later version.
  14
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 // You should have received a copy of the GNU General Public License along
  21 // with this library; see the file COPYING3.  If not see
  22 // <http://www.gnu.org/licenses/>.
  23
  24
  25 #include <future>
  26 #include <testsuite_hooks.h>
  27
  28 int iota() { static int i = 0; return i++; }
  29
  30 void test01()
  31 {
  32   std::packaged_task<int()> p1(iota);
  33   std::future<int> f1 = p1.get_future();
  34
  35   p1();
  36   p1.reset();
  37
  38   VERIFY( p1.valid() );
  39   VERIFY( f1.get() == 0 );
  40
  41   std::future<int> f2 = p1.get_future();
  42   p1();
  43   VERIFY( f2.get() == 1 );
  44 }
  45
  46 int main()
  47 {
  48   test01();
  49   return 0;
  50 }