C Struct Interface

C Struct Interface

[Noah Lavine]

Hello,

I'm trying to use Scheme structures, as defined in struct.c and
struct.h, and I have a question about the interface.

It seems from the code that scm_c_make_structv(vtable, ntail, ninit,
inits) is the main function for creating structs. I'm assuming that
ntail is the number of elements in the tail array of the struct, ninit
is the total number of elements I want to init, and inits is an array
containing the initial values. Is this correct?

Also, if I make a struct in this way, can I then do
SCM_STRUCT_SLOT_REF(struct, n) to get at it, where n=0 is the first
slot?

Thanks,
Noah

Re: C Struct Interface

[Andy Wingo]

Hello,

On Mon 12 Jul 2010 04:20, Noah Lavine <noah.b.lavine@gmail.com> writes:

> It seems from the code that scm_c_make_structv(vtable, ntail, ninit,
> inits) is the main function for creating structs. I'm assuming that
> ntail is the number of elements in the tail array of the struct

Yes. Avoid tail arrays if you can, they are confusing and a bad interface.

> ninit
> is the total number of elements I want to init, and inits is an array
> containing the initial values. Is this correct?

Yep. 

> Also, if I make a struct in this way, can I then do
> SCM_STRUCT_SLOT_REF(struct, n) to get at it, where n=0 is the first
> slot?

You can indeed, though this does no bounds checking.

Sorry for the undocumented state of things; patches to fix that most
welcome! ;)

Andy
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