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[Caml-list] CamlIDL and true abstract types
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Date: 2002-05-24 (16:55)
From: Dmitry Bely <dbely@m...>
Subject: Re: [Caml-list] CamlIDL and true abstract types
Lauri Alanko <la@iki.fi> writes:

>> typedef [abstract] void* Foo;
> Yes, I read about that, but I consider it a hack, not proper support.

I don't think so. IMHO the support is quite sufficient.

> Since CamlIDL considers Foo completely opaque and doesn't even see that
> it is a pointer, I cannot use pointer-specific attributes such as [ref],
> [unique] and [ignore].

Why do you need these attributes for abstract types? How are you going to
use them? What should they mean?

>  And saying that a type is void* when it really is
> Foo* isn't even strictly legal, the way the stubs are implemented:
> though conversion between void* and T* is legal for all object types T,
> conversion between void** and T** isn't, yet this is the sort of type
> punning that the generated stub code does.

I don't see the real problem here.

1. Conversion that stub funtions perform is always safe.
2. You can compile the stub with your library C headers, and then there
will be no conversion at all, because the original definition of type Foo
will be used:

typedef [abstract] void* Foo;

/* manually written */
#include "foo_native_definition.h"

$ camlidl test.idl

Hope to hear from you soon,

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