From: Chris Hecker <checker@d6.com>
To: caml-list@inria.fr
Subject: [Caml-list] currying...
Date: Tue, 06 Mar 2001 01:39:33 -0800 [thread overview]
Message-ID: <4.3.2.7.2.20010306012957.00c7cf00@shell16.ba.best.com> (raw)
How does caml know when to call a function? For example, say I have:
val f: int -> int -> int -> unit
and the definition of f is
let f x y = Printf.printf "%d %d" x y;Printf.printf "%d"
so f actually takes two ints, prints them, and then returns a function that takes an int and returns unit. From the val declaration above in a .cmi file, how can caml tell the difference between that f and this one:
let f x y z = Printf.printf "%d %d %d" x y z
How does it know "when" to call f, since you need a different number of parameters for the different definitions? The top f prints x y when it's called with two parms, so it doesn't wait until all three parms have been passed.
I have a feeling I'm missing something fundamental here, or else the definition of a function internally has a field for its arity and it just partially applies until it reaches the total arity. I thought I remembered seeing some documentation on this months ago, but I can't find it now...
It doesn't seem to partially evaluate the function or anything insane like that.
Chris
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next reply other threads:[~2001-03-06 9:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-06 9:39 Chris Hecker [this message]
2001-03-06 10:22 ` Thomas Colcombet
2001-03-06 10:33 ` Bruce Hoult
2001-03-06 10:50 ` Remi VANICAT
2001-03-06 16:31 ` Xavier Leroy
2001-03-06 17:41 ` Chris Hecker
2001-03-06 18:43 ` Sven LUTHER
2001-03-06 19:09 ` Marcin 'Qrczak' Kowalczyk
2001-03-06 20:14 ` Chris Hecker
2001-03-06 21:39 ` Marcin 'Qrczak' Kowalczyk
2001-03-06 23:23 ` Chris Hecker
2001-03-06 23:45 ` Marcin 'Qrczak' Kowalczyk
2001-03-07 1:10 ` Chris Hecker
2001-03-07 8:44 ` Marcin 'Qrczak' Kowalczyk
2001-03-06 23:51 ` Chris Hecker
2001-03-06 10:16 Adam Granicz
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