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[Caml-list] camlp4: ONCE construct
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Date: 2003-01-11 (01:23)
From: jehenrik <jehenrik@y...>
Subject: Re: [Caml-list] camlp4: ONCE construct
> See an article by Francois Pottier at
> http://caml.inria.fr/archives/200107/msg00187.html
> for (almost direct) answer.

Well, for my original question, consider the choice of regular 
expression compilation to be an arbitrary task.  The only point is that 
it be computationally expensive.  I have wanted the same thing in 
completely different contexts.

Jeff Henrikson

jehenrik> Hi,
jehenrik> I would like to write a Camlp4 construct which causes its 
argument to
jehenrik> only be evaluated once.  Eg:

jehenrik> ...
jehenrik> 	...
jehenrik> 		...
jehenrik> 			ONCE Pcre.regexp "([0-9]+)"

jehenrik> would be transformed to:

jehenrik> let gensym000 = Pcre.regexp "([0-9]+)";;
jehenrik> ...
jehenrik> 	...
jehenrik> 		...
jehenrik> 			gensym000

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