libstdc++-v3/testsuite/30_threads/promise/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 void test01()
  29 {
  30   bool test = false;
  31   using namespace std;
  32
  33   promise<int&> p1;
  34   p1.get_future();
  35
  36   try
  37   {
  38     p1.get_future();
  39     VERIFY( false );
  40   }
  41   catch (future_error& e)
  42   {
  43     VERIFY(e.code() == make_error_code(future_errc::future_already_retrieved));
  44     test = true;
  45   }
  46
  47   VERIFY( test );
  48 }
  49
  50 int main()
  51 {
  52   test01();
  53   return 0;
  54 }