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  • [parent not found: <jwv7f48xjk4.fsf-monnier+bug#25295@gnu.org>]
  • * RFC: User-defined pseudovectors
    @ 2013-10-10 11:22 Lars Brinkhoff
      2013-10-10 14:00 ` Stefan Monnier
      0 siblings, 1 reply; 55+ messages in thread
    From: Lars Brinkhoff @ 2013-10-10 11:22 UTC (permalink / raw)
      To: emacs-devel
    
    Hello,
    
    With the current FFI discussion, this may be a good time to ask for
    input on a Lisp extension I have lying around.
    
    Some FFI bindings may want to introduce new Lisp types.  My idea is
    that this should be possible to do in Lisp, not just in C.  This might
    also be useful in other situations, e.g.
    
    - Future new pseudovector types can be defined in Lisp.
    
    - Lisp code can potentially interoperate more easily with code in
    other languages.  Existing languages for Emacs include JavaScript
    (Ejacs), Python (Pymacs), Ruby (El4r), Perl (EPL), Smalltalk (Eoops),
    Common Lisp (Emacs Common Lisp).
    
    - Possibly cl-defstruct can be extended to make new types if so requested.
    
    The gist of my patch is to add a new type of pseudovector which is
    like a normal vector, except the first element holds a symbol which is
    its Lisp type.  So type-of returns whatever is in the first slot.
    This may sound slightly reckless, and probably is.  It's just a first
    shot.
    
    Sample session:
    
    (let ((x (make-typed-pseudovector 3 'foo nil)))
      (aset x 1 1)
      (aset x 2 2)
      (aset x 3 3)
      (list (read-from-string (with-output-to-string (prin1 x)))
            (typed-pseudovector-p x)
            (type-of x)
            (aref x 0)
            (aref x 3)
            (length x)))
    
     => ((#%[foo 1 2 3] . 13) t foo foo 3 4)
    
    
    
    
    ^ permalink raw reply	[flat|nested] 55+ messages in thread

    end of thread, other threads:[~2017-03-19 12:42 UTC | newest]
    
    Thread overview: 55+ messages (download: mbox.gz follow: Atom feed
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         [not found]         ` <jwvr34i2s8w.fsf-monnier+emacsbugs@gnu.org>
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         [not found]               ` <878tp0i74g.fsf@users.sourceforge.net>
         [not found]                 ` <jwvk28jmpl5.fsf-monnier+emacsbugs@gnu.org>
    2017-03-02  5:36                   ` Elisp printer (was: bug#25295: Represent eieio objects using object-print in backtraces and edebug) Michael Heerdegen
    2017-03-02  6:38                     ` Elisp printer Stefan Monnier
    2017-03-03  2:14                       ` Michael Heerdegen
    2017-03-03  2:38                         ` Stefan Monnier
    2017-03-03  4:23                           ` Michael Heerdegen
    2017-03-06  2:50                             ` Stefan Monnier
    2017-03-08  4:09                       ` Tom Tromey
    2017-03-08  4:39                         ` Stefan Monnier
    2017-03-08  6:35                           ` Tom Tromey
    2017-03-08  9:43                             ` Stefan Monnier
    2017-03-08 18:17                         ` Lars Brinkhoff
    2017-03-08 23:02                           ` Stefan Monnier
    2017-03-09 15:12                             ` Lars Brinkhoff
    2017-03-14  9:52                             ` User-defined record types Lars Brinkhoff
    2017-03-14 12:28                               ` Lars Brinkhoff
         [not found]                             ` <86bmt42nk2.fsf_-_@molnjunk.nocrew.org>
         [not found]                               ` <jwvzigoow0k.fsf-monnier+emacs@gnu.org>
    2017-03-14 13:25                                 ` Lars Brinkhoff
    2017-03-14 14:28                                   ` Lars Brinkhoff
    2017-03-14 15:20                                     ` Stefan Monnier
    2017-03-14 17:23                                       ` Lars Brinkhoff
    2017-03-15 14:38                                         ` Stefan Monnier
    2017-03-15 18:14                                           ` Lars Brinkhoff
    2017-03-15 19:12                                             ` Stefan Monnier
    2017-03-15 19:21                                               ` Lars Brinkhoff
    2017-03-15 20:05                                                 ` Stefan Monnier
    2017-03-15 21:49                                               ` Lars Brinkhoff
    2017-03-15 23:42                                                 ` Stefan Monnier
    2017-03-16  3:05                                               ` Stefan Monnier
    2017-03-16  3:08                                                 ` Stefan Monnier
    2017-03-16 20:03                                                 ` Lars Brinkhoff
    2017-03-16 21:32                                                   ` Stefan Monnier
    2017-03-17 11:22                                                     ` Lars Brinkhoff
    2017-03-17 20:45                                                     ` Lars Brinkhoff
    2017-03-18 23:24                                                 ` Stefan Monnier
    2017-03-18 23:36                                                   ` Stefan Monnier
    2017-03-19  9:34                                                   ` Lars Brinkhoff
    2017-03-19 12:42                                                     ` Stefan Monnier
         [not found] ` <jwv7f48xjk4.fsf-monnier+bug#25295@gnu.org>
         [not found]   ` <87innrc03h.fsf@users.sourceforge.net>
         [not found]     ` <jwvbmtjajfz.fsf-monnier+emacs@gnu.org>
         [not found]       ` <87k27w8j2l.fsf@users.sourceforge.net>
    2017-03-11 15:38         ` New pp (was: bug#25295: 26.0.50; Represent eieio objects using object-print in backtraces and edebug) Stefan Monnier
    2017-03-11 16:05           ` Noam Postavsky
    2017-03-11 16:40             ` New pp Stefan Monnier
    2017-03-11 16:52               ` Noam Postavsky
    2017-03-11 16:57                 ` Stefan Monnier
    2017-03-12 13:31                   ` Noam Postavsky
    2017-03-12 14:06                     ` Stefan Monnier
    2017-03-12 16:13                       ` Noam Postavsky
    2013-10-10 11:22 RFC: User-defined pseudovectors Lars Brinkhoff
    2013-10-10 14:00 ` Stefan Monnier
    2013-10-10 16:30   ` Lars Brinkhoff
    2013-10-10 20:42     ` Stefan Monnier
    2013-10-11  6:00       ` Lars Brinkhoff
    2013-10-11 12:22         ` Stefan Monnier
    2013-10-12 16:01           ` User-defined record types Lars Brinkhoff
    2013-10-12 18:58             ` Stefan Monnier
    2013-10-18 13:39               ` Ted Zlatanov
    2013-10-18 15:28                 ` Stefan Monnier
    2013-10-18 23:24                   ` Ted Zlatanov
    2013-10-19  2:09                     ` Stefan Monnier
    2013-10-19  2:30                       ` Drew Adams
    2013-10-19 11:48                       ` Ted Zlatanov
    2013-10-19 14:37                         ` Stefan Monnier
    2013-10-19 20:11                           ` Ted Zlatanov
    2013-10-19 21:48                             ` Stefan Monnier
    

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