[GiNaC-devel] Custom power evaluation

[kisilv at maths.leeds.ac.uk]

Dear Richy,

> My concerns are rather that rooting something as specialized
> inside the class hierarchy will not be useful enough but open the
> floodgates for much more specialized ideas and make the code even harder
> to understand for novices.

Once more: nothing specialised is intended for the GiNaC core classes.
This is only a pair of wires leading outside of the kernel where an end
user can connect his own devices to.

> Have you tried using subs or custom tree traversers for your purpose?
> (Along the ideas sketched in the FAQ, I mean.)

Imagine that any calculation with complex numbers will require manual
substitution of I^2=-1, will it be convenient? The purpose of the
extension is just to let a user a freedom to make some such simple rules
work automatically. It is the responsibility of the end user to decide
himself what kind of rules are suitable for his task.

I think that this is a nice way to keep GiNaC kernel small and tidy and
yet suitable for very wide set of questions.

Best wishes,
Vladimir
-- 
Vladimir V. Kisil       email: kisilv at maths.leeds.ac.uk
http://maths.leeds.ac.uk/~kisilv