QtConcurrent Questions and Clarifications

[wysota]

Hi Wysota,

The Extraction function takes a

QVector<double>

QVector<double>

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as its input and represents a single instance of the mapped input sequence (which I have just noticed is named the same thing e.g spectrain) The mapped spectrain is of the form

QVector<QVector<double> >

QVector<QVector<double> >

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. The actual declaration of Extraction within the feature_finder class is given below

QVector<QVector<QVector<QVector<double> > > > feature_finder::Extraction(QVector<double> spectrain)

QVector<QVector<QVector<QVector<double> > > > feature_finder::Extraction(QVector<double> spectrain)

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This is a correct call to mapped then:

#include <QtConcurrentMap>
#include <QVector>
 
QVector<QVector<double> > mapFunc(const QVector<double> inData) {
  return QVector<QVector<double> >();
}
 
int main(int argc, char **argv) {
  QVector<QVector<double> > inVector;
 
  QFuture<void> future = QtConcurrent::mapped(inVector, mapFunc);
  return 0;
}

#include <QtConcurrentMap>
#include <QVector>

QVector<QVector<double> > mapFunc(const QVector<double> inData) {
  return QVector<QVector<double> >();
}

int main(int argc, char **argv) {
  QVector<QVector<double> > inVector;
  
  QFuture<void> future = QtConcurrent::mapped(inVector, mapFunc);
  return 0;
}

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After the thread is done, "inVector" will contain the result of the call.

Can you expand a little on the
bit. If I can have a functor set these prior to the call to mapped() then it would help me a lot.

I'm not sure what to expand. The docs contain an example of using a functor (function object), just have a look at it.

Since I cant send any updates via QtConcurrent::run

Why not? You could post some custom events and then grab them and process them elsewhere.