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Extracting 'applobs' from smobs?

From: Dirk Herrmann
Subject: Extracting 'applobs' from smobs?
Date: Thu, 7 Dec 2000 17:50:10 +0100 (MET)

Hello everybody.

Just a thought:  Would it make sense to separate 'traditional' smobs and
applicable smobs, i. e. providing a scm_tc7_applob type?  What makes me
suspicious is the need to check for SCM_SMOB_APPLICABLE_P whenever the
evaluator encounters a smob.  Such if-then-elses in combination with types
always give the impression to me that two different concepts have been
merged together.

If there was a separate applob type (or whatever we would call it), there
would be a slightly different interface, since the 'apply' function would
be an essential part of the applob:

scm_bits_t scm_make_applob_type (
  char* name, scm_sizet size, 
  SCM (*apply) (), unsigned int req, unsigned int opt, unsigned int rst);

Then, there was no need for such checks within the evaluator.

Best regards,
Dirk Herrmann

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