CODEWITHSUNDEEP
c++multithreadingqtqthreadqfuture
The Quantum Physicist
The Quantum Physicist

Reputation: 26256

Is it possible to use QFuture without QtConcurrent?

I have a program with a QThread, which contains a network client. The client is supposed to take an object, process it, upload it to a server, get the response, and report back to the main thread. I did this with std::promise, and used its future. I made std::promise a member of the object emitted after having taken its future.

A minimal sample code is the following:

The object I'm emitting:

struct FileToUpload
{
    std::string fileData;
    std::string filename;
    std::promise<int> promise;
}

The part I'm using for emitting:

FileToUpload theFile;
auto uploadFuture = theFile.promise.get_future();
emit uploadFile(&theFile); //passing pointer because promise is non-copyable
auto uploadSuccess = uploadFuture.get();

Is there a Qt way to do the same?

I only found a QFuture class that can be used with QtConcurrent. I couldn't find a single example that explains how to use this with QThread. What are my options to do this with Qt correctly?

Upvotes: 2

Views: 821

Answers (1)

benlau
benlau

Reputation: 301

yes, you may use QFuture without QConcurrent. But the API is not documented. You may take a look with my wrapper library, AsyncFuture, at:

https://github.com/benlau/asyncfuture

It has a clear example to use QFuture like a promise object.

Upvotes: 2

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