From: Peter Seibel
Subject: Adding an :initarg?
Date: Sat, 08 Mar 2003 01:01:19 +0000
Message-ID: <m31y1iekq8.fsf@localhost.localdomain>

Suppose I have the following class:

  (defclass sequence-grammar (grammar)
    ((sequence :initarg :sequence :accessor sequence)))

Now I want to define a new class:

  (defclass string-grammar (sequence-grammar))

However, I'd really like string-grammar to have an :initarg and
:accessor for the sequence slot called :string. This seems to work (in
ACL 6.2 anyway) but I can't find the place in the CLHS that says it
should:

  (defclass string-grammar (sequence-grammar)
    ((sequence :initarg :string :accessor string)))

That is, with these definitions, I can say:

  [6c] BAZ(125): (defvar *s* (make-instance 'string-grammar :string "foo"))
  *S*
  [6c] BAZ(133): *s*
  #<STRING-GRAMMAR @ #x7149217a>
  [6c] BAZ(134): (sequence *s*)
  "foo"

Sec. 4.3.4.1 Examples of Inheritance seems to be doing a similar thing
but there isn't a ton of explination there. And I thought the examples
were non-normative anyway. Any pointers?

-Peter

-- 
Peter Seibel                                      ·····@javamonkey.com

  The intellectual level needed   for  system design is  in  general
  grossly  underestimated. I am  convinced  more than ever that this
  type of work is very difficult and that every effort to do it with
  other than the best people is doomed to either failure or moderate
  success at enormous expense. --Edsger Dijkstra

• Re: Adding an :initarg? Timothy Moore
  • Re: Adding an :initarg? Peter Seibel

From: Timothy Moore
Subject: Re: Adding an :initarg?
Date: Sat, 08 Mar 2003 06:26:43 +0000
Message-ID: <b4c2f3$kea$0@216.39.145.192>

Peter Seibel <·····@javamonkey.com> writes:

> Suppose I have the following class:
> 
>   (defclass sequence-grammar (grammar)
>     ((sequence :initarg :sequence :accessor sequence)))
> 
> Now I want to define a new class:
> 
>   (defclass string-grammar (sequence-grammar))
> 
> However, I'd really like string-grammar to have an :initarg and
> :accessor for the sequence slot called :string. This seems to work (in
> ACL 6.2 anyway) but I can't find the place in the CLHS that says it
> should:
> 
>   (defclass string-grammar (sequence-grammar)
>     ((sequence :initarg :string :accessor string)))
This is the way it works in all Lisps that follow the Spec. 


> Sec. 4.3.4.1 Examples of Inheritance seems to be doing a similar thing
> but there isn't a ton of explination there. And I thought the examples
> were non-normative anyway. Any pointers?

See 7.5.3 Inheritance of Slots and Slot Options

Tim

From: Peter Seibel
Subject: Re: Adding an :initarg?
Date: Sat, 08 Mar 2003 06:42:15 +0000
Message-ID: <m3of4mcqdj.fsf@localhost.localdomain>

Timothy Moore <·····@bricoworks.com> writes:

> See 7.5.3 Inheritance of Slots and Slot Options

Ah, perfect. Thanks.

-Peter

-- 
Peter Seibel                                      ·····@javamonkey.com

  The intellectual level needed   for  system design is  in  general
  grossly  underestimated. I am  convinced  more than ever that this
  type of work is very difficult and that every effort to do it with
  other than the best people is doomed to either failure or moderate
  success at enormous expense. --Edsger Dijkstra