libstdc++-v3/testsuite/30_threads/async/lwg2021.cc

   1 // Copyright (C) 2015-2017 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-rtems* *-*-darwin* powerpc-ibm-aix* } }
  19 // { dg-options "-pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* powerpc-ibm-aix* } }
  20 // { dg-require-effective-target c++11 }
  21 // { dg-require-cstdint "" }
  22 // { dg-require-gthreads "" }
  23
  24 // LWG 2021. Further incorrect usages of result_of
  25 // Arguments to result_of should use decay.
  26
  27 #include <future>
  28
  29 struct A
  30 {
  31   int operator()(int&&)&& { return 0; }
  32   void operator()(int&)& { }
  33 };
  34
  35 int main()
  36 {
  37   A a;
  38   int i = 0;
  39   std::future<int> f = std::async(a, i);
  40 }