Enumeration in GUILE

Enumeration in GUILE

[dv.praveen]

hi all,

I am creating new data types using smobs
in my application.  In the process I have
used some enums like

typedef enum { FIRST, SECOND, THIRD, NONE) CHOICE;

Is it possible to get these enums recognized by GUILE.
For instance, I have my own function,
"my-choice-is" which I would like to use it as.

guile> (my-choice-is FIRST)

If it is not possible is there a hack how I can use
it?

regards,
Praveen


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Re: Enumeration in GUILE

[Andreas Rottmann]

dv.praveen@skyworksinc.com writes:

> hi all,
>
> I am creating new data types using smobs
> in my application.  In the process I have
> used some enums like
>
> typedef enum { FIRST, SECOND, THIRD, NONE) CHOICE;
>
> Is it possible to get these enums recognized by GUILE.
> For instance, I have my own function,
> "my-choice-is" which I would like to use it as.
>
> guile> (my-choice-is FIRST)
>
> If it is not possible is there a hack how I can use
> it?
>
You may want to have a look at g-wrap, which is able to do this.

Regards, Andy
-- 
Andreas Rottmann         | Rotty@ICQ      | 118634484@ICQ | a.rottmann@gmx.at
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Re: Enumeration in GUILE

[Thien-Thi Nguyen]

   From: dv.praveen@skyworksinc.com
   Date: Thu, 9 Oct 2003 12:55:45 +0530

   typedef enum { FIRST, SECOND, THIRD, NONE) CHOICE;

   Is it possible to get these enums recognized by GUILE.

   guile> (my-choice-is FIRST)

there are three approaches: variables, symbols and keywords.  for
variables, you need to choose a symbol for each element, bind an integer
value to it, and arrange for your functions to accept numeric integers.
for symbols, your functions should accept symbols and translate them to
integers internally.  similarly for keywords.

using variables is a step backward in some sense.  even though the
symbols and keywords approach is a little more work to put in place, it
makes debugging simpler on the scheme side; a backtrace w/ symbols is
less work to understand than a backtrace w/ integers.  (presuming your
stuff is not buggy at the C level -- if that's the case, you have to
take care of that first. :-)

thi


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