[erlang-questions] Is it possible to obtain all the records information at macros expanding time? E.g. Something like shell's rl().

[Jayson Vantuyl]

It's not identical to rl(), but there is record_info().  It's actually  
not even a real function, as it gets expanded like a macro at compile  
time.  About the only place you see it much is creating Mnesia tables  
(to get the field names).

Read all about it here:  http://erlang.org/doc/reference_manual/records.html#8.7

8.7 is probably the more useful nooks in the Erlang Reference.  It's  
helpful to know stuff like this:

-record(moves,up,down,left,right).

record_info(fields,moves) -> [up,down,left,right];
record_info(size,moves) -> 5.

And most interesting:

#moves.down =:= 3.
X#moves.down =:= element(#moves.down, X).

On Sep 11, 2009, at 4:44 AM, Daniel Kwiecinski wrote:

> Hi folks,
>
>   Is it possible to obtain all the records information at macros  
> expanding
> time? E.g. Something like shell's *rl()*.
>
> Thank you in advance.
>
> -- 
> Kind Regards,
> Daniel Kwiecinski


-- 
Jayson Vantuyl
kagato@REDACTED