[Qt-interest] Using boost to bind function for QtConcurrent::run()

[Bo Thorsen]

Den 12-07-2011 17:13, Cole, Derek skrev:
> In the original code, I had declared future and watcher like so:
> QFutureWatcher<GDALDataset> watcher;
> QFuture<GDALDataset> future;
>
>
>
> It appears that if I change that to
>
> QFuture<void> future1 = QtConcurrent::run(
> boost::bind(&GDALDriver::CreateCopy,poNITFDriver, pszDstFilename,
> poDataset, FALSE, papszOptions, pfnProgress, progMessage));
>
> where I set the return type as void, this will compile and run the
> method properly.
>
> However, the CreateCopy() method is supposed to return a reference to a
> GDALDataset, so how can I now get to this returned object, when using boost?

Create a struct like this:

struct Args {
   GDALDataset* returnValue;
   // Other args here ...
};

And store that. Then you can create a function that only takes a pointer 
to this struct and let that call the real work function and store the 
return value.

Bo Thorsen,
Fionia Software.

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