[Exceptional C++ Style] Item 18 - Virtuality

[Kevlin Henney]

In message 
<C3571D9EA82596468B7C6D662C82B8240546F753 at RED-MSG-32.redmond.corp.microso
ft.com>, Herb Sutter <hsutter at microsoft.com> writes
>
>> Regardless of one's opinion of NVI, it is clear, from reading any of
>> Herb's material on the topic, that the goal is different. There is no
>> skeletal algorithm and there is one step that is delegated.
>
>Just a nit: Actually, the example I gave specifically points out that
>this allows the form of the function (including the number of distinct
>operations) to vary independently to best suit the audience (the outside
>world, or derived classes' customization hooks), and has multiple
>DoProcessPhaseN steps.

I think I mentioned in another posting that NVI can be refactored to TM, 
and a TM certainly satisfies the basic non-public properties. In other 
words, it would allow such a transformation, but it is not a necessary 
part of it. There are also other ways of achieving such a transformation 
-- other starting points that lead to the same end -- but other starting 
points also suggest other different paths, such as those based on 
delegation.

Kevlin
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