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


From: Barry Margolin
Subject: Re: Something like an array (list) of a class
Date: Mon, 13 Apr 2009 20:52:48 -0400
User-agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X)

In article 
<address@hidden>,
 Decebal <address@hidden> 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, address@hidden
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***


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