[Qt-interest] Non-Virtual Interface Idiom

[Arnold Krille]

Hi,

On Sunday 19 December 2010 20:19:02 Piotr Dobrogost wrote:
> One of design rules made popular by Herb Sutter is Non-Virtual Interface
> Idiom explained in the article "Virtuality" in C/C++ Users Journal, 19(9),
> September 2001 (http://www.gotw.ca/publications/mill18.htm), which can be
> summarized in the guideline "Prefer to make interfaces nonvirtual, using
> Template Method." In many places design of Qt classes does not obey this
> rule. Is there any rationale for this?

Lets try this for a rational:

 - Who is this guy and why do you think everybody has to follow his "rules"?
 - Why is this "rule" contradicting the design patterns of the gang-of-four?
 - If virtual functions are not to be used for defining abstract interfaces, 
why have them at all?

Have fun,

Arnold
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