[r6rs-discuss] Proposed features for small Scheme, part 9: modules

[John Cowan]

Alaric Snell-Pym scripsit:

> How do you handle conditional imports based on availability of modules?
> 
> Eg, "if we have opengl libraries, use them, otherwise do our own slow
> software rendering".

I think that is best handled by conditional inclusion rather than
conditional import.  You write a single module which exports a fixed
interface and then, depending on a con-expand in the body, includes either
the open-gl glue code or the software emulation code.  This relies on
people having the self-discipline to adopt the Scheme48 style of module,
where the body normally consists only of includes.

-- 
That you can cover for the plentiful            John Cowan
and often gaping errors, misconstruals,         http://www.ccil.org/~cowan
and disinformation in your posts                cowan at ccil.org
through sheer volume --that is another
misconception.  --Mike to Peter