Re: [Gm2] C IMPLEMENTATION MODULE?

[Gaius Mulley]

Hi Martin,

sorry I didn't see this email until now..

Martin Kalbfuß <address@hidden> writes:

> Oh. I forgot to look at the examples. While studying, I realized that
> there's a throw function inside the system module. It looks like the
> examples uses this function. I'm currently using the ISO exceptions,
> with an exception number, and an additional error message. Can I throw
> such an exception from C?
>
> maybe a struct like
>
> typedef struct
> {
>       int exception_number;
>       char *exception_msg;
> }EXCEPTION;
>
> or something similar?

yes M2 can throw an exception which can be caught by C++ and visa
versa.

> I assume a PACKEDSET is simply a number.

yes PACKEDSET is no different to SET in gnu m2.

> TYPE PACKEDSET OF [0..31];
>
> should represent an int32_t at the C side.

true

> And 
>
> TYPE PACKEDSET OF [0..7];
>
> should represent an int8_t.
>
> Is this correct?

correct!

>> yes you are right - it does need improving.  A section on how to do
>> this would be useful

I'll try can capture the info in the last few emails and place it into
the gm2 documentation,

regards,
Gaius