[squeak-dev] What are the current use cases for traits? (was: The Inbox: TraitsTests-pre.19.mcz)
David T. Lewis
lewis at mail.msen.com
Sun Mar 31 21:06:25 UTC 2019
On Sun, Mar 31, 2019 at 09:20:47PM +0200, Levente Uzonyi wrote:
> On Sat, 30 Mar 2019, David T. Lewis wrote:
>
> >Changing the subject line to focus on Levente's question.
> >
> >On Thu, Mar 28, 2019 at 06:43:11PM +0100, Levente Uzonyi wrote:
> >>
> >>What are the current use cases for traits?
> >
> >In order to experiment with Git based repositories, I have loaded the
> >Tonel package from the github repositories of Jakob Reschke.
> >
> > Installer ensureRecentMetacello.
> > (Smalltalk classNamed: #Metacello) new
> > repository: 'github://j4yk/tonel:squeak';
> > baseline: 'Tonel';
> > load.
> >
> >This brings in the FS-AnsiStreams package, which uses traits.
> >
> >Having traits in Squeak allows me to load this package.
>
> I haven't tried your snippet and I don't know which version of FS depends
> on Traits, but the one on SqueakSource definitely does not.
> Btw, Traits can be flattened, so it's possible to make it loadable into
> images with no Trait support.
My use case came about because I was reading the "Squeak on Tonel" thread
last month:
http://lists.squeakfoundation.org/pipermail/squeak-dev/2019-February/201567.html
Following advice in that thread, I loaded the package according to the
instructions here:
https://github.com/j4yk/tonel/blob/squeak/README.md
It worked :-)
I am not advocating for traits, just giving a use case for which the
support for traits in Squeak was helpful for me.
Dave
>
> So far all use cases of Traits in this thread (and its parent) were about
> interfaces. Squeak doesn't have a concept for that, and Traits are
> definitely more than just simple interfaces (as long as you don't want to
> interface state). Perhaps we need interfaces instead of traits.
>
> Levente
>
> >
> >Dave
>
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