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

   1 // Copyright (C) 2015-2016 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 " -std=gnu++11 -pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } }
  20 // { dg-options " -std=gnu++11 -pthreads" { target *-*-solaris* } }
  21 // { dg-options " -std=gnu++11 " { target *-*-cygwin *-*-rtems* *-*-darwin* } }
  22 // { dg-require-cstdint "" }
  23 // { dg-require-gthreads "" }
  24 // { dg-require-atomic-builtins "" }
  25
  26 // LWG 2021. Further incorrect usages of result_of
  27 // Arguments to result_of should use decay.
  28
  29 #include <future>
  30
  31 struct A
  32 {
  33   int operator()(int&&)&& { return 0; }
  34   void operator()(int&)& { }
  35 };
  36
  37 int main()
  38 {
  39   A a;
  40   int i = 0;
  41   std::future<int> f = std::async(a, i);
  42 }