libstdc++-v3/testsuite/30_threads/async/84532.cc

   1 // { dg-do compile { target c++11 } }
   2 // { dg-require-cstdint "" }
   3 // { dg-require-gthreads "" }
   4
   5 // Copyright (C) 2018 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include <future>
  23
  24 // PR libstdc++/84532
  25
  26 struct F
  27 {
  28   template<typename T, typename U>
  29     void operator()(T, U, int&)
  30     {
  31       using std::is_same;
  32       using std::reference_wrapper;
  33       static_assert(is_same<T, reference_wrapper<int>>::value, "");
  34       static_assert(is_same<U, reference_wrapper<const int>>::value, "");
  35     }
  36 };
  37 int i = 0;
  38 auto fut = std::async(F{}, std::ref(i), std::cref(i), std::ref(i));