QtConcurrent::run doesn't move passed arg

0...-5

I'm trying to run a function in a secondary thread using QtConcurrent::run. I'm passing function arg using move semantics, but it doesn't work. However, if I call my function directly everything is ok. That is my code:

void doSomething(QByteArrayList data) {
    qDebug() << "passed data is" << data;
}

int main(int argc, char *argv[]) {
    QByteArrayList data {{"123"}};
    auto watcher = QtConcurrent::run(&doSomething, std::move(data));
    watcher.waitForFinished();
    qDebug() << "data size is" << data.size();
    doSomething(std::move(data));
    qDebug() << "data size is" << data.size();
    return 0;
}

And that is produced output:

passed data is ("123")
data size is 1
passed data is ("123")
data size is 0

Christian Ehrlicher

Because QtConcurrent::run() takes const refs:

QFuture<T> run(QThreadPool *pool, const Class *object, T (Class::*fn)(Param1, Param2, Param3, Param4, Param5) const, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4, const Arg5 &arg5)

0...-5

@Christian-Ehrlicher Ok, I get it. But I think it would be nice to have an rvalue reference overload. The idea is the following: I have some resources to be passed to secondary thread, but I don't need it after that

Christian Ehrlicher

Then please fill a bug report. Maybe there is already one.