libstdc++-v3/testsuite/30_threads/packaged_task/cons/3.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) 2011-2020 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 // LWG 2067. packaged_task should have deleted copy c'tor with const parameter
  25
  26 #include <future>
  27 #include <thread>
  28 #include <testsuite_hooks.h>
  29
  30 template<typename F>
  31 std::future<typename std::result_of<F()>::type> spawn_task(F f)
  32 {
  33   typedef typename std::result_of<F()>::type result_type;
  34   std::packaged_task<result_type()> task(std::move(f));
  35   std::future<result_type> res(task.get_future());
  36   std::thread(std::move(task)).detach();
  37   return res;
  38 }
  39
  40 int get_res()
  41 {
  42   return 42;
  43 }
  44
  45 void test01()
  46 {
  47   auto f = spawn_task(get_res);
  48   VERIFY( f.get() == get_res() );
  49 }
  50
  51 int main()
  52 {
  53   test01();
  54 }