Most elegant way to call method in an object in another thread

Tarae

I have a simple class:

class MyClass
{
public:
    int getWorkResult() { return doSomeWork(); }
private:
    int doSomeWork();
};

I want to be able to call getWorkResult() from every thread of my program. But doSomeWork() must always run in the same thread, because of synchronization.
What is the best way? I want calling getWorkResult() from all the threads be simple as possible. I don't mind that threads may be waiting for a while to the result.

My solution so far:

class MyClass : public QObject
{
    Q_OBJECT
public:
    MyClass()
    {
        connect(this, &MyClass::getWorkResultSignal, 
                this, &MyClass::getWorkResultSlot,
                Qt::BlockingQueuedConnection);
    }

    int getWorkResult()
    {
        int result;
        emit getWorkResultSignal(&result);
        return result;
    }
signals:
     void getWorkResultSignal(int * returnValue);
private slots:
     void getWorkResultSlot(int * returnValue){ &returnValue = doSomeWork(); }
private:
     int doSomeWork();  
}

Now I can call getWorkResult() really simply in every thread:

int result = myClass->getWorkResult();

Is my solution correct? Is there a better solution?

Chris Kawa

You can just do

int getWorkResult()
{
    int result;
    QMetaObject::invokeMethod(this, &MyClass::doSomeWork, &result);
    return result;
}

This will do all the connection plumbing for you.