Re: [Pharo-users] Package extension. Adding instance variables to classes

[Herbert Vojčík]

Guillermo Polito wrote:
Just be careful, that privateState thing looks like a Moose only Famix 
feature. It't not available in plain Pharo objects :)

In ES6 mailing list, they had this problem re how to do private state 
for objects, and it was shown that having private state is sort of 
isomorphic to having WeakMap indexed by objects. So in case of Pharo, 
I'd say using WeakIdentitityKeyDictionary can do the trick. Without 
resorting to any external dependency.

Herby

On Wed, May 9, 2018 at 2:09 AM, Alidra Abdelghani via Pharo-users 
<pharo-users@lists.pharo.org <mailto:pharo-users@lists.pharo.org>> wrote:



    ---------- Forwarded message ----------
    From: Alidra Abdelghani <alidran...@yahoo.fr
    <mailto:alidran...@yahoo.fr>>
    To: Pavel Krivanek <pavel.kriva...@gmail.com
    <mailto:pavel.kriva...@gmail.com>>
    Cc: Any question about pharo is welcome <pharo-users@lists.pharo.org
    <mailto:pharo-users@lists.pharo.org>>
    Bcc:
    Date: Wed, 9 May 2018 01:09:06 +0100
    Subject: Re: Package extension. Adding instance variables to classes
    Hi Pavel,

    Thank you for your answer.
    I actually didn’t know about this mechanism.
    I think it is will do the job :)
      I have probably to rewrite some parts pf my code to access my
    variables through privateState.  no?


    Thanks again
    Abdelghani
    On 07 May 2018, at 13:15, pharo-users-requ...@lists.pharo.org
    <mailto:pharo-users-requ...@lists.pharo.org> wrote:


    Message: 1
    Date: Mon, 7 May 2018 13:43:56 +0200
    From: Pavel Krivanek <pavel.kriva...@gmail.com
    <mailto:pavel.kriva...@gmail.com>>
    To: Any question about pharo is welcome
    <pharo-users@lists.pharo.org <mailto:pharo-users@lists.pharo.org>>
    Subject: Re: [Pharo-users] Package extension. Adding instance
    variables to classes
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    2018-05-07 12:25 GMT+02:00 Alidra Abdelghani via Pharo-users <
    pharo-users@lists.pharo.org <mailto:pharo-users@lists.pharo.org>>:



    ---------- P?eposlan? zpr?va ----------
    From: Alidra Abdelghani <alidran...@yahoo.fr
    <mailto:alidran...@yahoo.fr>>
    To:pharo-users@lists.pharo.org <mailto:pharo-users@lists.pharo.org>
    Cc:
    Bcc:
    Date: Mon, 7 May 2018 11:25:49 +0100
    Subject: Package extension. Adding instance variables to classes
    Hi,

    I am working on a package named ClassNamesAnalyzer and I need to
    add code
    to third party classes in other packages (for instance the FAMIX-Core
    package).
    ?Extending? third party classes with methods is easy; I just need to
    categorise my methods under the *ClassNamesAnalyzer protocole so that
    loading my package will load them in the image.
    However, if I want to add instance variables to theses classes,
    they are
    not there when I load the package in a new image.

    *So my question is* : is there a way to include instance variables
    addition to other packages in my package?


    Currently not, you should use privateState


    *Another question is* : is it good practice to add instance
    variables to
    classes in third party packages and is there a way to avoid it
    (because I
    am not very confortable with that idea)?


    It is not, see FAMIXContainerEntity>>#definedAnnotationTypes how
    this issue
    is currently being solved using the privateState.

    Cheers,
    -- Pavel



    Thanks in advance,
    Abdelghani






--

        

Guille Polito

Research Engineer

Centre de Recherche en Informatique, Signal et Automatique de Lille

CRIStAL - UMR 9189

French National Center for Scientific Research - _http://www.cnrs.fr_


*Web:* _http://guillep.github.io_

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