[Caml-list] CamlIdl possible issue

[Caml-list] CamlIdl possible issue

[Shishir Ramam]

Hi,
I am trying to use CamlIdl (Ocaml 3.07+2 win32) and have this case in which 
I understand what is happening, not sure why it  has been implemented thus. 

For the following structure, when SOME_VAR is *not* defined, 
---
struct my_test {
	int x;
#ifdef SOME_VAR
	int y;
#endif
};
---

CamlIdl converts this to 
---
let my_test = int
---

This is because a structure with one element is getting special attention in 
Struct.ml_declaration. 

Knowing very little about the MIDL specification, I attempted to run this 
against a MIDL compiler for the following result -
---
struct  my_test
    {
    int x;
    };
---

It seems that the special casing of the single element is not the best of
things for my application, since any reference to the element x will have to be
modified in the Ocaml program depending on whether SOME_VAR is defined or not. 

IMHO this seems like a bug. Was wondering if there is some other explanation 
for this.

Thanks in advance for any help.
-shishir

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Re: [Caml-list] CamlIdl possible issue

[Matthieu Dubuget]

Shishir Ramam a écrit :
> It seems that the special casing of the single element is not the best of
> things for my application, since any reference to the element x will have to be
> modified in the Ocaml program depending on whether SOME_VAR is defined or not. 
> 
> IMHO this seems like a bug. Was wondering if there is some other explanation 
> for this.

According to the documentation, this is a design choice.

> 
> Thanks in advance for any help.

If this problem appears not two often you can avoid it by adding your 
own ml2c and c2ml functions using the attributes ml2c and c2ml.

I hope this helps.

Salutations

Matthieu Dubuget

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Re: [Caml-list] CamlIdl possible issue

[Shishir Ramam]

Matthieu,
Thanks for the quick response. 

> If this problem appears not two often you can avoid it by adding your
> own ml2c and c2ml functions using the attributes ml2c and c2ml.

That is exactly what I have done. 

Was wondering if there's any chance I can influence a change in the 
design for this case.

regards,
-shishir

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