Comments on: Initializer list and initializing derived class members

By: Frogger

Frogger — Sat, 30 Jan 2010 10:14:32 +0000

Thank you!!
I’m a learner and I needed to know. I used to learn slow but now i’m just blazing it’s great! I’m excited for life!!!
Also thanks Tomek for that I understood it actually which is great IT MEANS I’M LEARNING!!! yes
All smiles!

Thanks again random google person, i’m favoriting your site thing.

By: Jarosław Dobrzański

Jarosław Dobrzański — Wed, 02 Dec 2009 10:31:29 +0000

Good point!

By: Tomek

Tomek — Wed, 02 Dec 2009 10:05:15 +0000

You could create another constructor in B that accepts _z and then call that constructor in your derived class D:

D(int _x, int _y, int _z) : B(_z), x(_x), y(_y+1) {}

I didn’t try compiling it though.
Anyway, initialization lists provide better performance only for bigger objects. And it is worth to remember that members are always initialized in the order in which they are declared in the class definition.