How to create async/await code in C++?

Question

I'm using remote RPC of my network service and I don't want to create any delegates in my code with binding an other things. I want to wrote pseudo-asynchroused code. Something like this:

 await (MyServer->RemoteMethod(parameter_1, parameter_2), 
      [=] (int32 return_value_1, int32 return_value_2) {
           UE_LOG(MyLog, Log, TEXT("RemoteMethod called with result %i %i"), return_value_1, return_value_2);
      });

I'm not too strong in functional programming of latest C++ versions. But I know there is things like std::function. Can this help me?

Also I need that code must be cross-platform.

svick · Accepted Answer · 2016-05-01 13:13:55Z

3

What you're describing is not async-await, with that, you would be able to write:

std::pair<int32, int32> return_values = await MyServer->RemoteMethod(parameter_1, parameter_2);
UE_LOG(MyLog, Log, TEXT("RemoteMethod called with result %i %i"), return_values.first, return_values.second);

I believe this feature is planned to be in some future version of C++.

What you're describing is a continuation and you can use boost::future for that:

boost::future<std::pair<int32, int32>> return_values_future = MyServer->RemoteMethod(parameter_1, parameter_2);
return_values_future.then([=](boost::future<std::pair<int32, int32>> fut) {
    UE_LOG(MyLog, Log, TEXT("RemoteMethod called with result %i %i"), fut.get().first, fut.get().second);
});

answered May 1, 2016 at 13:13

svick

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1 Comment

Charlie Over a year ago

'await' is a part of a pending proposal from MS for C++ coroutines - looks like some of it may be usable in some versions of Visual Studio youtube.com/watch?v=_fu0gx-xseY for a presentation on it from last year's cppcon.

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