rtti() of derived class

[quickNitin]

Here is small pbm i am facing.

I have deriver a MyCanvasItem class from Q3CanvasPolygonal class.
i have overridded rtti() to return specific value.
But it clicking on this MyCanvasItem is return 2i.e. Q3CanvasPolygonal::RTTI.

where i can improve upon.

quickNitin

[jpn]

Is it declared virtual in the base class (Q3CanvasPolygonal)? Does the signature of the function match exactly (including constness)?

[quickNitin]

ya there was some difference. Now it works

in Q3CanavsPolygonal class it is defined as
virtual int rtti() const{}

but i declared it as member
virtual const int rtti() {}. How this declaration is diffrent from above? I am not awar of difference. It has become now C++ doubt.

now i had declare rtti() very same as in parent class and now it is working.

thanks jpn

[jacek]

in Q3CanavsPolygonal class it is defined as
virtual int rtti() const{}

but i declared it as member
virtual const int rtti() {}. How this declaration is diffrent from above?

First one is a "const" (i.e. non-mutating) method that returns an integer, while second one is a normal method that returns a constant integer.

In short: "const" methods can't change member variables and therefore they can be invoked on constant objects.

http://www.parashift.com/c++-faq-lit...rrectness.html

[quickNitin]

thanks jacek
its working well now!