Re: [Chicken-users] define-record and define-record-type

[Kon Lovett]

On Apr 26, 2010, at 11:17 AM, Jeronimo Pellegrini wrote:

> Hello,
>
> I see that I can (use srfi-9), but define-record-type is already
> available, even if I don't (use) the module. Can I always count on  
> that?

W/ Chicken. Part of the non-standard syntax unit - use, and-let*,  
optional, etc.

> I also see from
>
> http://chicken.wiki.br/manual/Non-standard%20macros%20and%20special%20forms#record-structures
>
> that besides SRFI-9 define-record-type there is also a define-record  
> that
> has a somewhat
> different interface. Besides the different interface, is there any  
> other
> differences between
> those? (Memory usage pattern, efficiency etc?)

'define-record' creates a ctor, pred, getters & setters for all  
fields. 'define-record-type' gives more control over the generated  
api; also a SRFI so wider support.

Chicken has a native type - structure (a tagged vector) - which is  
used for both kinds of records. So one getter is pretty much like  
another.

You might look at the "defstruct" egg.

> Thanks,
> J.
>
>
>
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Best Wishes,
Kon