which one has finished with QFutrueWatcher

[wookoon]

Hi , all

I need compute some different data at one time ,so I use the QtConcurrent:run to

compute the data , and use QFutrueWatcher to monitor the computing state.

Here is the a section of the code.

**.h    
 
    QVector<QFuture<void> *> ftVec;
    QVector<QFutureWatcher<void> *> ftwVec;
 
 
**.cpp
 
    //begin a new computation.
    ftVec << new QFuture<void>;
    ftwVec << new QFutureWatcher<void>;
 
    connect(ftwVec[num], SIGNAL(finished()),this, SLOT(getresultFunction()));
 
    *ftVec[num] = QtConcurrent::run(this,&MainWindow::computeFuntion);
    ftwVec[num]->setFuture(*ftVec[num]);
    num++;

**.h    

    QVector<QFuture<void> *> ftVec;
    QVector<QFutureWatcher<void> *> ftwVec;


**.cpp

    //begin a new computation.
    ftVec << new QFuture<void>;
    ftwVec << new QFutureWatcher<void>;

    connect(ftwVec[num], SIGNAL(finished()),this, SLOT(getresultFunction()));

    *ftVec[num] = QtConcurrent::run(this,&MainWindow::computeFuntion);
    ftwVec[num]->setFuture(*ftVec[num]);
    num++;

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I want know which watcher is finished when it execute the function getresultFunction.

Give me some suggestions. Thanks..!

[tbscope]

The most correct way to do this is to use a QSignalMapper

[wysota]

You are probably overcomplicating things. Try this approach:

void MainWindow::computeFunction(const MyArg &arg) {
  doSomethingWith(arg);
} // static
 
QList<MyArg> computations;
fillDataInto(computations);
QFutureWatcher watcher;
connect(&watcher, SIGNAL(resultReadyAt(int)), ...);
QFuture<void> future = QtConcurrent::map(computations, MainWindow::computeFunction);
watcher.setFuture(future);

void MainWindow::computeFunction(const MyArg &arg) {
  doSomethingWith(arg);
} // static

QList<MyArg> computations;
fillDataInto(computations);
QFutureWatcher watcher;
connect(&watcher, SIGNAL(resultReadyAt(int)), ...);
QFuture<void> future = QtConcurrent::map(computations, MainWindow::computeFunction);
watcher.setFuture(future);

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You'll get much cleaner design.