[Small-cl-src] Re: Small, occasionally handy piece of code

[Steven E. Harris]

Ingvar <ingvar at cathouse.bofh.se> writes:

> Haven't we all felt the need of generating combinations from a
> collection and calling a function for every combination?

I wrote one a while ago that may cons less because it requires use of
vectors to represent the sequences. The interface to
call-with-combinations is similar to yours, with the argument order
mixed up.

There's a lower-level function call-with-n-combo-slots that is useful
when one has both the source and working "target" vectors in hand. The
target vector is used to present the caller-provided function with the
current combination, similar to your "acc" argument.

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Steven E. Harris        :: seharris at raytheon.com
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