libstdc++-v3/testsuite/30_threads/promise/members/get_future.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 void test01()
  29 {
  30   std::promise<int&> p1;
  31   std::future<int&> f1 = p1.get_future();
  32
  33   VERIFY( f1.valid() );
  34
  35   int i1 = 0;
  36
  37   p1.set_value(i1);
  38
  39   int& i2 = f1.get();
  40
  41   VERIFY( &i1 == &i2 );
  42 }
  43
  44 int main()
  45 {
  46   test01();
  47   return 0;
  48 }