function composition in C

[bert]

	Does anyone know how to write a compose function in C,
without writing a Scheme interpreter to do it in.

A call should look something like this:
	(compose(sqr,cube)) (2)
which would evaluate to 64.

	"compose" is a one-liner in any functional language,
but I suspect that it is, given the above constraint, impossible in C.
(then again, I'm just an undergrad, so what would I know :-)

	Feel free to use pointers wherever they seem appropriate.
	(so the above call could look like:
	(*compose(&sqr,&cube)) (2)	   )

	Many thanks for everyone's helpful comments!

		Bert Thompson.