libstdc++-v3/testsuite/30_threads/packaged_task/members/get_future2.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2009-2023 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23
  24 #include <future>
  25 #include <system_error>
  26 #include <testsuite_hooks.h>
  27
  28 int& inc(int& i) { return ++i; }
  29
  30 void test01()
  31 {
  32   bool test = false;
  33
  34   std::packaged_task<int&(int&)> p1(inc);
  35   p1.get_future();
  36
  37   try
  38   {
  39     p1.get_future();
  40     VERIFY( false );
  41   }
  42   catch (const std::future_error& e)
  43   {
  44     VERIFY( e.code() == std::future_errc::future_already_retrieved );
  45     test = true;
  46   }
  47
  48   VERIFY( test );
  49 }
  50
  51 int main()
  52 {
  53   test01();
  54   return 0;
  55 }