Re: [TCLCORE] Pre-CFV: TIP#257
by Twylite other posts by this author
May 5 2008 3:56AM messages near this date
Re: [TCLCORE] Tcl-Core Digest, Vol 24, Issue 5
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Re: [TCLCORE] Pre-CFV: TIP#257
Hi,
> Might be better to use a variable resolver. But that's deep voodoo (and
> not something I understand fully either).
Mmm. I once looked at how Tcl accomplishes variable and command
resolution. Had nightmares for weeks ;) I had imagined that there
would be a command-resolution-stack and a variable-resolution-stack, and
entering a proc would push namespace information onto the
command-resolution-stack and a local frame onto the
variable-resolution-stack. I imagined this while wondering if there
might be a better way to implement "dict with".
Anyway I mention this because it strikes me as an interesting way to
address a lot of resolution problems that are currently - I understand -
handled in a variety of different ways and by different code, most of
which fiddle with the frame's variable table.
> > Would it be worth considering an additional "meta" parameter to a
> > method definition (before or afeter the argslist). Such a parameter
> > could be used in future to extend the functionality of methods
> > without breaking the interface.
> > For example:
> > - oo::define c method my_func {autovars true} {args} { ... }
> > In this case meta is treated as a dict, and TclOO knows about the
> > "autovars" value which will cause the object's variables to be
> > implicitly brought into scope (like import_object_vars above)
> It might be better to think in terms of several modes of operation. So
> you can have "none" (the current behaviour), "declarer" (only the vars
> from the class declaring the method), "super" (the vars from the class
> declaring the method and its superclasses) and "all" (all vars defined
> on the object, including those from the subclasses of the class
> declaring the method). There might be other modes too; those are just
> the obvious thought of in about 10 seconds. :-)
Sounds good to me. In my reading of the TclOO commands this morning I
couldn't find any way to get a list of variables associated with a
specific class (only all variables associated with an object) ...
- Is this something that can be done by the C internals?
- Could this be exposed by a "info class variables"?
Regards,
Trevor
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