Re: [Sbcl-devel] Proposal for typed read syntax (was Re: Print-readably bug)

[Matthew D. S. <ak...@ch...>]

On Wed, 5 Aug 2009 02:10:51 +0300
Nikodemus Siivola <nik...@ra...> wrote:

> 2009/8/4 Kevin Reid <kp...@ma...>:
>
> I assume you mean for this to be EQL specialized? An alternative
> implementation would be a PPRINT-DISPATCH-style dispatch table -- no
> real performance difference there, and less build trouble. (Not that
> those build troubles are insurmountable.)
> 
> > Option 2 has the useful property that it can be used as a hook for
> > user-defined read  syntax identified by symbol (benefiting from the
> > package system) rather than by readtable and character; new kinds of
> > readable object could be introduced without requiring the user to
> > choose readtables. (Think of it as #S extended beyond structures.)
> 
> This _is_ an attractive feature. I'm not convinced that ~A would not
> serve our immediate needs better, but you make a good case for the
> general version.
> 
For what it's worth I'm for any reader extensibility would lessen
the need to actually muck about with read-tables. 

Matt   
-- 
"You do not really understand something unless you can explain it to
your grandmother." -- Albert Einstein.