Hi, There was an initiative I've seen in http://labs.qt.nokia.com/2011/05/26/cpp0x-in-qt/ that Qt intends to support features included in C++0x, including lambdas. I must also point out that lambdas already work with GCC and MSVC.
I'd like to point out some very good use cases for lambdas and recommend some features for Qt based on them which would make everyone's life a lot easier. Let's say you have a collection (QList) of something and you want to filter or find some elements from it. This is currently only doable with a foreach loop. So you each time you want to find something, you will need a foreach loop in your app. MS.NET uses lambdas in a creative way to address this (the technique is called LINQ), and I think we could easily add similar functionality to Qt. I have implemented a class that provides a simplistic implementation of the above and put together a small example code to demonstrate how it works. http://pastebin.com/tZdkJQCd http://pastebin.com/WiC6MTNn I think a similar class (or the implementation of these methods in QList itself) could be a reasonable improvement in Qt. The other area where I would love to see lambdas is signal-slot connections: allow the developers to connect signals to inline lambda functions, similar to how C# lets you connect event handlers to anonymous delegates. I haven't thought about how to implement this one yet, but I'm sure it would be considered a great feature. I'm curious, what do you guys think about these? As for me, I'd love to see these feature in Qt 5. Cheers, Timur _______________________________________________ Qt5-feedback mailing list [email protected] http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback
