QtConcurrent, Unresolved Overloaded Function Type

[lynchkp]

Hey everyone,

I'm trying to incorportate QtConcurrent into one of my classes, and I'm starting simple with it:

#include "coredata.h"
 
CoreData::CoreData()
{
 
}
 
void CoreData::afunc()
{
 
}
 
void CoreData::threaded()
{
    QFuture<void> future = QtConcurrent::run(afunc);  
}

#include "coredata.h"

CoreData::CoreData()
{

}

void CoreData::afunc()
{

}

void CoreData::threaded()
{
    QFuture<void> future = QtConcurrent::run(afunc);  
}

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This results in an error:
error: no matching function for call to 'run(<unresolved overloaded function type>)'

I've looked through the Qt Documentation, and since it is all within the main() function, I don't know how it works within a class. I have a feeling I'm missing something simple, but I'm relatively new to C++ and the solution is escaping me.

Thanks in advance!!

[wysota]

You don't have a "afunc" function. You only have a CoreData::afunc method.

QFuture<void> future = QtConcurrent::run(this, &CoreData::afunc);

QFuture<void> future = QtConcurrent::run(this, &CoreData::afunc);

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[lynchkp]

Thank you for the help; I implemented that in my code and it works great. However, after looking through the documentation I believe the QtConcurrent::map would be better since it allows control over the timing, which I need.

I have a vector "idxvec" that has n elements, going from 0 to n. I'd like to implement the function like this:

vector<qint32> idxvec(nregions);
 
for (idx = 0; idx < nregions; idx++)
    idxvec[idx] = idx;
 
QtConcurrent::map(idxvec,this,&CoreData::runCorrelation);

vector<qint32> idxvec(nregions);

for (idx = 0; idx < nregions; idx++)
    idxvec[idx] = idx;

QtConcurrent::map(idxvec,this,&CoreData::runCorrelation);

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However this doesn't compile. I apologize for all these questions, the documentation is really sparse about this

Thanks!

[tbscope]

The prototype of the function you want to use is:

QFuture<void> QtConcurrent::map ( Iterator begin, Iterator end, MapFunction function )

As you can see, using "this" for "Iterator end" does not work, neither does the first parameter work.

[lynchkp]

I'm trying to implement that prototype, however the problem I'm having is that I cannot use my class method CoreData::runCorrelation as the function. Do I need to use boost::bind to attach the class method to the this pointer?

Thanks,

[wysota]

Can you make your runCorrelation method static? If yes then do so.