libcxx/test/std/thread/futures/futures.promise/set_value_void.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-exceptions
  10 // UNSUPPORTED: no-threads
  11 // UNSUPPORTED: c++03
  12
  13 // <future>
  14
  15 // class promise<R>
  16
  17 // void promise<void>::set_value();
  18
  19 #include <future>
  20 #include <cassert>
  21
  22 #include "test_macros.h"
  23
  24 int main(int, char**)
  25 {
  26     {
  27         typedef void T;
  28         std::promise<T> p;
  29         std::future<T> f = p.get_future();
  30         p.set_value();
  31         f.get();
  32         try
  33         {
  34             p.set_value();
  35             assert(false);
  36         }
  37         catch (const std::future_error& e)
  38         {
  39             assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
  40         }
  41     }
  42
  43   return 0;
  44 }