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

   1 // { dg-do compile { target c++11 } }
   2 // { dg-require-gthreads "" }
   3
   4 // Copyright (C) 2018-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <thread>
  22
  23 // PR libstdc++/84532
  24
  25 struct F
  26 {
  27   template<typename T, typename U>
  28     void operator()(T, U, int&)
  29     {
  30       using std::is_same;
  31       using std::reference_wrapper;
  32       static_assert(is_same<T, reference_wrapper<int>>::value, "");
  33       static_assert(is_same<U, reference_wrapper<const int>>::value, "");
  34     }
  35 };
  36 int i = 0;
  37 std::thread t(F{}, std::ref(i), std::cref(i), std::ref(i));