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Syntactic inclusion of in ?
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Date: 2005-04-09 (10:35)
From: Richard Jones <rich@a...>
Subject: Re: [Caml-list] Syntactic inclusion of in ?
On Fri, Apr 08, 2005 at 07:41:42PM +0200, Sébastien Hinderer wrote:
> (How) is it possible to include syntactically a file in a file
> ?
> One method that seems to w)rk is to rename to,
> and then have in a line saying
> #include ""
> And with this, gcc -E >
> produces a file that ocamlc can apparently handle.

I'm not 100% clear on what you want to do.

A common requirement is to split a large module into a number of
smaller files, which is then compiled back into a single large module.
This can be done using a preprocessor (such as cpp) - see the -pp
option to the compiler.  Often it's better just to use a single large
file and a capable editor, with "folding"[1] capabilities.

Another one is to include the symbols from one module in another.
This can be done using the 'include' directive in OCaml, eg:

-- ----
let foo = 1

-- ----
include A
let bar = 2

Now, if compiled in the correct order, module B will export symbols
'foo' and 'bar'.

'include' and 'open' are very similar.  The difference is that
'include' causes the symbols imported to be (re-)exported.  'open A'
on the other hand makes the symbols in A available inside B, but they
are not exported in B's interface.

Another option is to use the -pack argument when linking [not
supported on all platforms].  This causes modules to be nested inside
a "super-module".

For example,

  ocamlc -pack -o c.cmo a.cmo b.cmo

(IIRC) creates a module called C containing C.A and C.B modules.



Richard Jones, CTO Merjis Ltd.
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