single virtual inheritance

[Martin Krischik]

Am Sonntag 13 Juli 2008 schrieb - -:

> What is the cost, if any, of inheriting a virtual base class only once
> (not using multiple inheritance) vs. non-virtual single inheritance?

The cost is a single pointer redirection - the same as between 
using  "some_type some_var" and  "some_type& some_var".

But the gain is extensabitlity and maintainabiltiy. I have seen the neibouring 
team doing a one week 5 person refactoring run because they dicovered the 
value of  virtual inheritance to late.

Always remember: there is a cost of not using a feature as well - and it might 
be your weekend not beeing at home but doing refactoring.

Martin
-- 
Martin Krischik
mailto://krischik@users.sourceforge.net
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