Re: persistent lisp objects

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I have no idea what he thinks as novel, but such functions have been
> available for ages.  Called print and read.

There is nothing new.
I just show a feature of the CL version of `eval-when-compile'.
Thus since we have a new representation of hash-table in emacs-cvs, this
allow to save hash-tables to a compiled file.
But other lisp objects (e.g lists) can be saved in the same way in
inferior emacs versions.
I just provide a basic function to demonstrate this feature.(see
precedent posts)
The emacs manual say that about eval-when-compile:

,----
|  -- Special Form: eval-when-compile forms...
|      The FORMS are evaluated at compile-time; at execution time, this
|      form acts like a quoted constant of the resulting value.  Used at
|      top-level, `eval-when-compile' is just like `eval-when (compile
|      eval)'.  In other contexts, `eval-when-compile' allows code to be
|      evaluated once at compile-time for efficiency or other reasons.
| 
|      This form is similar to the `#.' syntax of true Common Lisp.
`----

Please read that about the `#.' feature of CL:

http://www.cs.cmu.edu/Groups/AI/html/faqs/lang/lisp/part5/faq-doc-5.html

That is surely not the best way to serialize objects, but that is better
than nothing until somebody write something to save hash-table, lists,
etc... in a data base.

-- 
A + Thierry Volpiatto
Location: Saint-Cyr-Sur-Mer - France