From: Eric Niebler (eric_at_[hidden])
Date: 2008-03-20 17:53:22
Larry Evans wrote:
> What about recording the arity *with* the tag instead of in
> the expression associated with the tag? IOW, instead of:
>
> expr<Tag,Args,Arity>
>
> have:
>
> expr<tag_arity<Tag,Arity>,Args>
>
> Why? Well, it directly associates the arity with the Tag instead
> of with the expression. After all, sin(X) is not expressed
> as sin(x,1). [or in lisp terms, (sin x) is not expressed as
> (sin x 1) ].
What problem does that solve?
-- Eric Niebler Boost Consulting www.boost-consulting.com