Hi guys,
I’m trying to understand an example from the Racket manuals.
(struct mood-procedure (base rating)
#:property prop:procedure (struct-field-index base))
(define happy+ (mood-procedure add1 10))
(happy+ 2) <= 3
How does this work? It appears that prop:procedure is predefined. It appears
that prop:procedure is assigned the value of whatever is assigned to the base
slot of the struct, in this case add1. But although mood-procedure is a struct,
happy+ appears to be a procedure! If I make mood-procedure transparent then
happy+ looks like this:
(add1 #<procedure:add1> 10)
I’m not sure how the #:property kw made this transformation, nor what it means
in terms of the uses of #:property. Any insight is appreciated.
Kevin
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