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Help => System => Topic started by: tomas on July 08, 2009, 05:29:44 pm

Title: Providing class member function to thread?
Post by: tomas on July 08, 2009, 05:29:44 pm

I want to run a class member function in a separate thread. Is there any straightforward way of doing this? An hour of googling and trial-and-error experimenting hasn't helped me in this case. It is obviously not as easy as

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sf::Thread Thread(&MyObject.MyFunction);.

I tried things like

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typedef void (SomeClass::*fptr)();
fptr ptrMyFunction;
ptrMyFunction = &SomeClass::MyFunction;

to get the member function pointer, but it doesn't seem to work.

Title: Providing class member function to thread?
Post by: Laurent on July 08, 2009, 05:38:49 pm

You can't. sf::Thread only accepts free function pointers.

But that's the C-style way of using it, you'd better make your class inherit from it (see the tutorial for more informations).

Title: Providing class member function to thread?
Post by: tomas on July 08, 2009, 05:47:45 pm

OK, I see. I solved it by having a wrapper function with an infinity loop that calls the class member function instead.

Title: Providing class member function to thread?
Post by: Laurent on July 08, 2009, 05:50:10 pm

Looks like an ugly solution. Why don't you make your class privately inherit from sf::Thread instead?

Title: Providing class member function to thread?
Post by: tomas on July 08, 2009, 05:55:56 pm

Hmm, I wouldn't know how to do that right away, not that experienced with C++. I will look at the tutorials again and try to figure out a good solution. Thanks for the tip.

EDIT: Implemented it in that way now. Works great and is a pretty solution. Thanks.