libstdc++-v3/testsuite/30_threads/call_once/dr2442.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3
   4 // Copyright (C) 2016-2024 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 <mutex>
  22 #include <testsuite_hooks.h>
  23
  24 void f(int& a, int&& b) { a = 1; b = 2; }
  25
  26 void
  27 test01()
  28 {
  29   // LWG 2442. call_once() shouldn't DECAY_COPY()
  30   std::once_flag once;
  31   int i = 0;
  32   int j = 0;
  33   call_once(once, f, i, std::move(j));
  34   VERIFY( i == 1 );
  35   VERIFY( j == 2 );
  36 }
  37
  38 int
  39 main()
  40 {
  41   test01();
  42 }