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>>>>> "Thomas" == Thomas Bushnell <tb@xxxxxxxxxx> writes: Thomas> Richard Kelsey <kelsey@xxxxxxx> writes: >> If I'm using some exotic number representation (constructive reals, >> perhaps), then EXTRACT_DOUBLE may very well involve some pretty hairy, >> hence possibly GC-causing, computation. >> >> This doesn't worry me too much; there aren't a lot of such >> implementations around. Let me rephrase: In what kind of environment would "hairy" *necessarily* imply "GC-causing"? (There used to be a version of Scheme 48 where the equivalent of SCHEME_EXTRACT_LONG could cause a GC because it could do a callback. This was an implementation convenience, not a necessity, and it's gone now.) -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla