Just curious, can someone give me an real life example of when you would need to use pool variables and no other variable would work?
On Jun 29, 2013, at 7:00 AM, beginners-request@lists.squeakfoundation.org wrote:
Yes, class variables will be visible to subclasses of subclasses and so on. Also, I didn't mention pool variables, but 99.9% of the time you won't want to use those.
Hi John,
You might want to parse a configuration file but you are not sure where it is used. You could share these values using pool variables.
It actually is useful but you can certainly accomplish this may other ways.
All the best,
Ron Teitelbaum
-----Original Message----- From: beginners-bounces@lists.squeakfoundation.org [mailto:beginners- bounces@lists.squeakfoundation.org] On Behalf Of Joseph J Alotta Sent: Monday, July 01, 2013 11:16 PM To: beginners@lists.squeakfoundation.org Subject: [Newbies] Pool Variables
Just curious, can someone give me an real life example of when you would
need
to use pool variables and no other variable would work?
On Jun 29, 2013, at 7:00 AM, beginners-request@lists.squeakfoundation.org wrote:
Yes, class variables will be visible to subclasses of subclasses and so
on.
Also, I didn't mention pool variables, but 99.9% of the time you won't want to use those.
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
On Tuesday 02 July 2013 08:46 AM, Joseph J Alotta wrote:
Just curious, can someone give me an real life example of when you would need to use pool variables and no other variable would work?
Generally information from external world are made available through pool variables since they are broadly consumed by many classes. Examples are * Physical or Math constants like pi, e, ... * Conventional names for weeks, months, colors, directions, playing cards, chess pieces. * Elements of binary file headers * Character and Font tables * Sensor events coming from hardware devices (like button codes)
Explore
SharedPool subclasses
to see real-life usage in method source codes.
HTH .. Subbu
Hi Joseph,
On Tuesday 02 July 2013 08:46 AM, Joseph J Alotta wrote:
Just curious, can someone give me an real life example of when you would need to use pool variables and no other variable would work?
Generally information from external world are made available through pool variables since they are broadly consumed by many classes. Examples are
- Physical or Math constants like pi, e, ...
- Conventional names for weeks, months, colors, directions, playing
cards, chess pieces.
- Elements of binary file headers
- Character and Font tables
- Sensor events coming from hardware devices (like button codes)
Explore
SharedPool subclasses
to see real-life usage in method source codes. HTH .. Subbu
I agree with Subbu. If you take a look at my contribution: http://ss3.gemstone.com/ss/minecraft.html/Overview?_s=pxWnk5AQYKMk4B4B&_...
to Bert's Minecraft bindings you will see how I use them to make the calls to Minecraft read better and make it so you don't have to remember what number (value) goes with what Minecraft color or texture.
I have also recently used one in some of my VA Smalltalk GUI programs to hold an object with some help information, like where the user was in various layers of windows and panes within windows. I could have passed this object into each window but it is a lot of work just to avoid using what amounts to a global variable.
Lou ----------------------------------------------------------- Louis LaBrunda Keystone Software Corp. SkypeMe callto://PhotonDemon mailto:Lou@Keystone-Software.com http://www.Keystone-Software.com
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