[interfacekit] Re: A little help...

Adi Oanca:

> How do I get rid of this error message:
> src/kits/interface/Window.cpp: In method `bool BWindow::NeedsUpdate()
> const':
> src/kits/interface/Window.cpp:1126: passing `const BLooper' as `this'
> argument of `bool BLooper::Lock()' discards qualifiers
> src/kits/interface/Window.cpp:1128: passing `const BWindow' as `this'
> argument of `void BLooper::Unlock()' discards qualifiers

You can't call non-const functions from a const function.
Declaring it const promises to the compiler that you don't
modify any data. There is one exception, you can modify
variables that have been declared as mutable.

> bool BWindow::NeedsUpdate() const{
Obviously, you can't remove the const here.

>      Lock();
>      serverLink->FlushWithReply( &replyData );
>      Unlock();

If you really need to lock here, you need to cheat
and use a const=5Fcast as Ingo suggested.

Or you directly do whatever lock does, and make sure
that the variable that is modified is mutable.

Marcus

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