scott wrote:

> Couldn't you just define a * function that takes a velocity and a time 
> and returns a position?

No.

I rephrase: Not if you want those to be different types.

The functions +, -, * and / are only defined to operate on values of the 
exact same type (and return a result of the same type also).

You can, however, define new functions with the appropriate types. (Say, 
have functions named |+|, |-|, etc. or something like that.) 
Alternatively, you can provide new definitions for +, -, etc., but then 
you have to manually remove access to the standard versions every time 
you want to use them.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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