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From: Larry Evans (cppljevans_at_[hidden])
Date: 2004-02-28 10:05:00

On 02/28/2004 08:24 AM, Larry Evans wrote:
> On 02/28/2004 08:08 AM, Larry Evans wrote:
>> On 02/27/2004 11:01 PM, Brian McNamara wrote:
> [snip]
> One thing I forgot to emphasize is that this design pattern seeks

Ok, maybe just one more thing: tree<B> has additional virtual
functions. This, in essence, distinguishes this pattern from the
"pattern" implemented by boost graph properties AFAICT. I really
haven't looked closely at graph properties, but I assume they don't
have virtual methods associated with the added properties. What I
need is a virtual function associated with the new property. For
example, the regexp_nilable_top::calc_nilable method is associated
with the added property, synattr_nilable::my_nilable. Without this
virtual function, in order to calculate my_nilable for each node, each
node would have to have a flag indicating which regexp_tree type it
was, and a possibly large switch statement on this flag to dispatch to
the correct calc_nilable code.

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