libstdc++-v3/testsuite/30_threads/call_once/49668.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3
   4 // Copyright (C) 2011-2022 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 <functional>
  23 #include <testsuite_hooks.h>
  24
  25 struct moveable
  26 {
  27   moveable() = default;
  28   moveable(moveable&&) = default;
  29   moveable(const moveable&) = delete;
  30 };
  31
  32 typedef decltype(std::placeholders::_1) placeholder_type;
  33
  34 void f(moveable, placeholder_type, bool& b) { b = true; }
  35
  36 void test01()
  37 {
  38   bool test = false;
  39   std::once_flag once;
  40   std::call_once(once, f, moveable(), std::placeholders::_1, std::ref(test));
  41   VERIFY( test );
  42 }
  43
  44 int main()
  45 {
  46   test01();
  47 }