On Apr 21, 2012, at 11:52 AM, Chad Albers wrote: > Hi, > > I'm looking for an example of treating a struct like a port, which appears to > be possible: > http://docs.racket-lang.org/reference/portstructs.html?q=struct#(def._((quote._~23~25kernel)._prop~3ainput-port)) > > Apparently, this is a lot easier that using make-custom-port. What I would > like to do is be able to declare a struct, set it's prop:input-port property, > pass an instance of struct to a port procedure, like (read-bytes > string-that-acts-like-port), and have the bytes sent to the read-bytes > actually contain bytes that were stored in the fields of the struct itself. > Is that possible, and is that the reason why one would treat a struct like a > port? > > Thanks in advance for any examples,
Do you mean something like this: #lang racket (struct i (x) #:property prop:input-port 0) (define an-i (i (open-input-string "hello world"))) (read an-i) ;; yields 'hello -- Matthias
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