libcxx/test/std/thread/futures/futures.unique_future/default.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // UNSUPPORTED: no-threads
  10
  11 // <future>
  12
  13 // class future<R>
  14
  15 // future();
  16
  17 #include <future>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24     {
  25         std::future<int> f;
  26         assert(!f.valid());
  27     }
  28     {
  29         std::future<int&> f;
  30         assert(!f.valid());
  31     }
  32     {
  33         std::future<void> f;
  34         assert(!f.valid());
  35     }
  36
  37   return 0;
  38 }