From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: lgreg.meredith@gmail.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] recursive modules?
Date: Thu, 01 Jun 2006 08:51:13 +0900 (JST) [thread overview]
Message-ID: <20060601.085113.112630104.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <5de3f5ca0605311235h1f1db228t8e10f4ef65233e05@mail.gmail.com>
From: "L.G. Meredith" <lgreg.meredith@gmail.com>
> i'm mostly a neophyte with OCaml. Please find below a simple example of a
> code i would like to be able to write, but that the compiler will not eat. i
> build a term language over a set of variables that are themselves abstractly
> characterized in terms of some identifier type. i would like to write a
> recursive module in which the abstract type of identifier is essentially the
> type of the joinedcompositionfunctor applied to itself. One can show that
> this results in a (mathematically) well-founded definition. Is there a
> version of OCaml or an OCaml compiler option that will enable this kind of
> recursive definition?
RTFM :-) Recursive modules are in the "language extensions" chapter.
Here is what I believe should be your module (if I understood
correctly your intent.)
module rec VariableOfRJoinedComposition :
(IDENTIFIER with type idType =
JoinedCompositionFunctor(VariableOfRJoinedComposition).composite)
= struct
module RJoinedCompositionEquivalence =
Equivalence ( JoinedCompositionFunctor )( VariableOfRJoinedComposition )
type idType = RJoinedCompositionEquivalence.JoinedComposition.composite
let comparator =
RJoinedCompositionEquivalence.structural
end
prev parent reply other threads:[~2006-06-01 0:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-31 19:35 L.G. Meredith
2006-05-31 23:51 ` Jacques Garrigue [this message]
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