Re: Something like an array (list) of a class

[Barry Margolin <barmar@alum.mit.edu>]

In article 
<67e696b0-bdf8-45e2-86d6-4a696bb2ecfa@r37g2000yqn.googlegroups.com>,
 Decebal <CLDWesterhof@gmail.com> wrote:

> I know have:
>     (require 'cl)
> 
>     (defstruct
>       (ModeLine
>        (:constructor nil)
>        (:constructor new-ModeLine (type description display function))
>        )
>       (type        :read-only t)
>       (description :read-only t)
>       (display     :read-only t)
>       (function    :read-only t)
>       )
> 
>     (setq modelineArray
>           [
>            (new-ModeLine
>             "chars"
>             "Display number of chars"
>             "C"
>             'buffer-count-chars2
>             )
>            (new-ModeLine
>             "lines"
>             "Display number of lines"
>             "L"
>             'buffer-count-lines2
>             )
>            (new-ModeLine
>             "words"
>             "Display number of words"
>             "W"
>             'buffer-count-words2
>             )
>            ]
>           )
> 
> But there are a few problems:
> - I would like to have the vector modelineArray readonly. Is this
> possible?

The syntax of a slot specification is

(slot-name default options...)

In your defstruct, you specified :read-only as the default, so it's not 
being taken as an option name.  Try:

(type nil :read-only t)


> - The vector is notfilled with ModeLine objects. When executing:
>     (aref modelineArray 2)
> I get:
>     (new-ModeLine "words" "Display number of words" "W" (quote buffer-
> count-words2))
> So I can not do something like:
>     (ModeLine-type (aref modelineArray 2))
> What is the good way to fill the vector?

[...] is for literals, it doesn't evaluate its contents.  Use (vector 
...) instead.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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