Re: Add method to one object only?

[Jon Kleiser]

Thanks. In my case I wanted the object itself to create the new method, so I 
did like this:

(push This '(newMsg> () (prinl "Yes!")))

/Jon

> On 10. Jun, 2016, at 13:07, Alexander Burger  wrote:
> 
> On Fri, Jun 10, 2016 at 11:50:07AM +0200, Alexander Burger wrote:
>>   (push Obj (cons 'msg> '((X) (bar
>> 
>> or
>> 
>>   (push Obj '(msg> (X) (bar)))
> 
> Two notes:
> 
> 1. If the symbol 'msg>' is not yet defined as a message in another
>   context (e.g. with (dm msg> ...)), then you can do that on the fly
>   with:
> 
>  (setq msg> meth)
> 
> 2. Instead of 'push'ing the method into the value as above, you may
>   sometimes pass it already when creating the object:
> 
>  (setq Obj
> (new '((msg> (N) (+ (: a) N)) +Cls)
>'a 7
>'s "abc" ) )
> 
>  (msg> Obj 1)
>  -> 8
> 
> ♪♫ Alex

Re: Add method to one object only?

[Alexander Burger]

On Fri, Jun 10, 2016 at 11:50:07AM +0200, Alexander Burger wrote:
>(push Obj (cons 'msg> '((X) (bar
> 
> or
> 
>(push Obj '(msg> (X) (bar)))

Two notes:

1. If the symbol 'msg>' is not yet defined as a message in another
   context (e.g. with (dm msg> ...)), then you can do that on the fly
   with:

  (setq msg> meth)

2. Instead of 'push'ing the method into the value as above, you may
   sometimes pass it already when creating the object:

  (setq Obj
 (new '((msg> (N) (+ (: a) N)) +Cls)
'a 7
's "abc" ) )

  (msg> Obj 1)
  -> 8

♪♫ Alex
-- 
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Re: Add method to one object only?

[Jon Kleiser]

Thanks, Alex! That was nice and easy.

/Jon

> On 10. Jun, 2016, at 11:50, Alexander Burger  wrote:
> 
> Hi Jon,
> 
>> If one has a few objects of the same class +C, would it be possible to
>> add a new method to just one of these objects, without all the others
>> also getting that new method?
> 
> You can add a method to an object (or also a class) by adding a cons
> pair (msg> . fun) to its value.
> 
>   (push Obj (cons 'msg> '((X) (bar
> 
> or
> 
>   (push Obj '(msg> (X) (bar)))
> 
> Internally, there is no formal difference between classes and objects.
> 
> ♪♫ Alex
> -- 
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Add method to one object only?

[Jon Kleiser]

Hi,

If one has a few objects of the same class +C, would it be possible to add a 
new method to just one of these objects, without all the others also getting 
that new method?

/Jon--
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