libcxx/test/std/thread/futures/futures.promise/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 // UNSUPPORTED: c++03
  11
  12 // <future>
  13
  14 // class promise<R>
  15
  16 // promise();
  17
  18 #include <future>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25     {
  26         std::promise<int> p;
  27         std::future<int> f = p.get_future();
  28         assert(f.valid());
  29     }
  30     {
  31         std::promise<int&> p;
  32         std::future<int&> f = p.get_future();
  33         assert(f.valid());
  34     }
  35     {
  36         std::promise<void> p;
  37         std::future<void> f = p.get_future();
  38         assert(f.valid());
  39     }
  40
  41   return 0;
  42 }