Squeak does not support multiple inheritance.
Sadly enough the possibility of Multiple Inheritance in Squeak would greatly benefit me in my current Squeak project ?
What would you suggest to squeeze some sort of Multiple Inheritance into Squeak ?
- C-like Macros / or some kind of automation - Traits - some other possibilities
What is your experience ?
The idea to design my system better and introduce more abstraction is valid, but I still would like to stick Multiple Inheritance.
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Hi Warakom,
On 11/13/06, Warakorn Paphrawat warakorn_paphrawat@yahoo.com wrote:
Sadly enough the possibility of Multiple Inheritance in Squeak would greatly benefit me in my current Squeak project ?
what exactly is the characteristic in your project that imposes this requirement on it? Why do you need multiple inheritance? What would you use it for?
I'd recomment looking at traits first, but without knowing what exactly you are trying to achieve, I cannot say much more. :-)
Best,
Michael
Here's an idea:
I have a Person class, but I need him to inherit traits that the Human class has and the Ninja class has.
Is that sufficient?
On 11/13/06, Michael Haupt mhaupt@gmail.com wrote:
Hi Warakom,
On 11/13/06, Warakorn Paphrawat warakorn_paphrawat@yahoo.com wrote:
Sadly enough the possibility of Multiple Inheritance in Squeak would
greatly
benefit me in my current Squeak project ?
what exactly is the characteristic in your project that imposes this requirement on it? Why do you need multiple inheritance? What would you use it for?
I'd recomment looking at traits first, but without knowing what exactly you are trying to achieve, I cannot say much more. :-)
Best,
Michael _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Here's an idea:
I have a Person class, but I need him to inherit traits that the Human class has and the Ninja class has.
Is that sufficient?
"I need him to inherit 'traits' that the Human"
This is what "Traits" are for... Traits were meant to supercede multiple inheritance.
Ramon Leon http://onsmalltalk.com
I obviously have much to learn. Thanks!
On 11/13/06, Ramon Leon ramon.leon@allresnet.com wrote:
Here's an idea:
I have a Person class, but I need him to inherit traits that the Human class has and the Ninja class has.
Is that sufficient?
"I need him to inherit 'traits' that the Human"
This is what "Traits" are for... Traits were meant to supercede multiple inheritance.
Ramon Leon http://onsmalltalk.com
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
There are some lightweight ways of handling this using roles.
Person
instanceVariables: roles
aPerson roles add: Human new; add: Ninja new.
There are a number of roles implementations. One based on doesNotUnderstand which runs through the roles collection and passes the called but not understandable message to each instance. Some implementations will return a collection of responses if multiple roles answer the same message, and this can get kinda tricky if you don't know how to watch for it. You can also define a specific interface to your methods by specifically implementing your methods on Person to look for a role before forwarding the method and handling the call if it does not.
For Example:
Person >> killSilently
aPerson hasNinjaRole ifTrue: [^self ninjaRole killSilently].
aPerson hasHumanRole ifTrue: [^self humanRole killSilently].
aPerson handleKillingRequestWithMoreSleepAndExercise.
Ninja >> killSilently
"walk on rice paper leaving no trace then you will be ready"
self doSilentKilling
Human >> killSilently
"humanity wins"
self tryToKill.
self goToPoliceStation.
self confess.
I'm not saying I like roles. I just thought I'd mention more options.
Ron Teitelbaum
President / Principal Software Engineer
US Medical Record Specialists
Ron@USMedRec.com
_____
From: beginners-bounces@lists.squeakfoundation.org [mailto:beginners-bounces@lists.squeakfoundation.org] On Behalf Of Michael Gorsuch Sent: Monday, November 13, 2006 3:56 PM To: A friendly place to get answers to even the most basic questions aboutSqueak. Subject: Re: [Newbies] How to squeeze Multiple Inheritance into Squeak ?
Here's an idea:
I have a Person class, but I need him to inherit traits that the Human class has and the Ninja class has.
Is that sufficient?
On 11/13/06, Michael Haupt mhaupt@gmail.com wrote:
Hi Warakom,
On 11/13/06, Warakorn Paphrawat warakorn_paphrawat@yahoo.com wrote:
Sadly enough the possibility of Multiple Inheritance in Squeak would
greatly
benefit me in my current Squeak project ?
what exactly is the characteristic in your project that imposes this requirement on it? Why do you need multiple inheritance? What would you use it for?
I'd recomment looking at traits first, but without knowing what exactly you are trying to achieve, I cannot say much more. :-)
Best,
Michael _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Hi Warakorn,
maybe it is a little bit late now, for a nice answer, but I will do it anyway.
You want multiple inheritance? Why? Usually multiple inheritance is not necessary at all.
Objects communicate via messages, and we have only objects in Squeak! In my mind the only idea behind having inheritance is, you don't want to code the same things again and again. So you can create generic objects that implement the functionalities, several Objects might use. I think that's clear. I red that your object should understand all the messages a "human-object" understands and a "ninja-object understands", ok, thats fine. Now I have 2 suggestions: 1. Isn't a ninja object a kind of human object, (if you use your common sense, don't think only in terms of your program, please). So you could inherit the ninja class (object) from the human class. Your new object would be inherited from this ninja class, which is a human class and would understand all messages, both do understand. But ok, this structure is static. 2. You could just teach your object to understand the same messages like a ninja class, if you would just implement this messages in your object. But again, this is a static structure.
And here is a third one, that maybe you had in mind. I provides a dynamic structure. Imagine you would bundle the messages that ninja objects understand, and you could add this bundle to your object, which is a human inheritance. I think this is done using traits. I know that there are traits in squeak or at least some people work on this, but I don't know how you use this things. There are other people that might be able to answer this "how" question. I am more on asking the what question, what exactly do you want to do (the purpose, not the means)?
Best regards,
Patty
Warakorn Paphrawat schrieb:
Squeak does not support multiple inheritance.
Sadly enough the possibility of Multiple Inheritance in Squeak would greatly benefit me in my current Squeak project ?
What would you suggest to squeeze some sort of Multiple Inheritance into Squeak ?
- C-like Macros / or some kind of automation
- Traits
- some other possibilities
What is your experience ?
The idea to design my system better and introduce more abstraction is valid, but I still would like to stick Multiple Inheritance.
Want to start your own business? Learn how on Yahoo! Small Business. http://us.rd.yahoo.com/evt=41244/*http://smallbusiness.yahoo.com/r-index
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
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Michael Gorsuch -
Michael Haupt -
Patty Gadegast -
Ramon Leon -
Ron Teitelbaum -
Warakorn Paphrawat