libstdc++-v3/testsuite/30_threads/call_once/dr2442.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) 2016-2020 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 #include <mutex>
  25 #include <testsuite_hooks.h>
  26
  27 void f(int& a, int&& b) { a = 1; b = 2; }
  28
  29 void
  30 test01()
  31 {
  32   // LWG 2442. call_once() shouldn't DECAY_COPY()
  33   std::once_flag once;
  34   int i = 0;
  35   int j = 0;
  36   call_once(once, f, i, std::move(j));
  37   VERIFY( i == 1 );
  38   VERIFY( j == 2 );
  39 }
  40
  41 int
  42 main()
  43 {
  44   test01();
  45 }