[Newbies] Traits Example

Oscar Nierstrasz oscar.nierstrasz at gmail.com
Mon Mar 17 11:07:46 UTC 2008

Hi Rob,

What you say seems to make sense, but it is hard to tell without  
looking at some code.

There are some simple examples of traits in Chapter 5 of Squeak by  


- on

On Mar 17, 2008, at 2:37, Rob Rothwell wrote:

> Hello,
> Can anyone give me a simple Traits example?  I am trying to figure  
> out if it would be useful for me in the context of developing Aida  
> applications.
> In Aida, a WebApplication observes a domain model object.  Let's  
> call it WebAppModel.
> Of course, you could subclass ANY object to create your WebAppModel,  
> but I still want it to know how to do certain things, like start and  
> stop itself.
> In other words, I might have one WebAppModel that subclasses Object,  
> and another that subclasses OrderedCollection, but I don't want to  
> teach them both how to start or stop each time I create a new one,  
> and it seems less elegant to subclass everything from a WebAppModel  
> base class and then include the actual objects they model as  
> instance variables.
> Does this make sense or am I missing some other fundamental concept,  
> and is this what Traits are for?
> Thanks,
> Rob Rothwell
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