libstdc++-v3/testsuite/30_threads/packaged_task/members/get_future2.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-cstdint "" }
   6 // { dg-require-gthreads "" }
   7
   8 // Copyright (C) 2009-2018 Free Software Foundation, Inc.
   9 //
  10 // This file is part of the GNU ISO C++ Library.  This library is free
  11 // software; you can redistribute it and/or modify it under the
  12 // terms of the GNU General Public License as published by the
  13 // Free Software Foundation; either version 3, or (at your option)
  14 // any later version.
  15
  16 // This library is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 // You should have received a copy of the GNU General Public License along
  22 // with this library; see the file COPYING3.  If not see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #include <future>
  27 #include <system_error>
  28 #include <testsuite_hooks.h>
  29
  30 int& inc(int& i) { return ++i; }
  31
  32 void test01()
  33 {
  34   bool test = false;
  35
  36   std::packaged_task<int&(int&)> p1(inc);
  37   p1.get_future();
  38
  39   try
  40   {
  41     p1.get_future();
  42     VERIFY( false );
  43   }
  44   catch (const std::future_error& e)
  45   {
  46     VERIFY( e.code() == std::future_errc::future_already_retrieved );
  47     test = true;
  48   }
  49
  50   VERIFY( test );
  51 }
  52
  53 int main()
  54 {
  55   test01();
  56   return 0;
  57 }