Question

I read on internet that subclassing (that deriving a class from Qthread) and then over writing run function to perform the required task is not the correct way to use Qthread. But i have read in some books and on Qt documentation to use the subclassing way?

can you tell me why shouldn’t use the subclassing way? Subclassing Qthread is an easy way to use thread (for me because i am a beginner).

Thanks.

Answer 1

QThread was designed and is intended to be used as an interface or a control point to an operating system thread, not as a place to put code that you want to run in a thread. We object-oriented programmers subclass because we want to extend or specialize the base class functionality. The only valid reasons I can think of for subclassing QThread is to add functionality that QThread doesn’t have, e.g. perhaps providing a pointer to memory to use as the thread’s stack, or possibly adding real-time interfaces/support. Code to download a file, or to query a database, or to do any other kind of processing should not be added to a subclass of QThread; it should be encapsulated in an object of it’s own.

for more details please check this..

http://labs.qt.nokia.com/2010/06/17/youre-doing-it-wrong/