libstdc++-v3/testsuite/30_threads/promise/members/get_future.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) 2009-2024 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 <testsuite_hooks.h>
  26
  27 void test01()
  28 {
  29   std::promise<int&> p1;
  30   std::future<int&> f1 = p1.get_future();
  31
  32   VERIFY( f1.valid() );
  33
  34   int i1 = 0;
  35
  36   p1.set_value(i1);
  37
  38   int& i2 = f1.get();
  39
  40   VERIFY( &i1 == &i2 );
  41 }
  42
  43 int main()
  44 {
  45   test01();
  46   return 0;
  47 }