[r6rs-discuss] Records simplification/question

[Michael Sperber]

AndrevanTonder <andre at het.brown.edu> writes:

> - On p.67, it is not quite explained what happens if
>   "parent-constructor-descriptor" is #f.  The document states:
>
>   "If rtd is an extension of another record type
>    parent-rtd, parent-constructor-descriptor must be
>    a constructor descriptor of parent-rtd or #f. If
>    parent-constructor-descriptor is #f, a default constructor
>    descriptor is supplied. In this case, p is a procedure that
>    accepts the same number of arguments as the constructor
>    of parent-constructor-descriptor ....."
>
>   but the last phrase "the constructor of parent-constructor-descriptor"
>   has no meaning here, if "in this case" refers to the case where
>   "parent-contructor-descriptor" is #f, which the sentence seems to imply.
>   I don't think that this was the intent, but this is the way it reads.
>   In any case, I can't quite figure out from the prose what the default
>   parent constructor descriptor is supposed to be in the #f case.

I'll try to clarify.  The default constructor is one that accepts as
many arguments as there are fields and initializes the fields to them.

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla