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Improve the implementation, documentation of #'labels, #'flet. lisp/ChangeLog addition: 2011-09-07 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el: * bytecomp.el (for-effect): Move this earlier in the file, it's referenced in byte-compile-initial-macro-environment. * bytecomp.el (byte-compile-initial-macro-environment): In the byte-compile-macro-environment definition for #'labels, put off the compiling the lambda bodies until the point where the rest of the form is being compiled, allowing the lambda bodies to access appropriate values for byte-compile-bound-variables, and reducing excessive warning about free variables. Add a byte-compile-macro-environment definition for #'flet. This modifies byte-compile-function-environment appropriately, and warns about bindings of functions that have macro definitions in the current environment, about functions that have byte codes, and about functions that have byte-compile methods (which may not do what the user wants at runtime). * bytecomp.el (byte-compile-funcall): If FUNCTION is constant, call #'byte-compile-callargs-warn if that's appropriate, giving warnings about problems with calling functions bound with #'labels. * cl-macs.el: * cl-macs.el (flet): Mention the main difference from Common Lisp, that the bindings are dynamic, not lexical. Counsel the use of #'labels, not #'flet, for this and other reasons. Explain the limited single use case for #'flet. Cross-reference to bytecomp.el in a comment. * cl-macs.el (labels): Go into detail on which functions may be called from where. Explain how to access the function definition of a label within FORM. Add a comment cross-referencing to bytecomp.el. man/ChangeLog addition: 2011-09-07 Aidan Kehoe <kehoea@parhasard.net> * cl.texi (Function Bindings): Move #'labels first, describe it in more detail, explaining that it is to be preferred over #'flet, and explaining why. Explain that dynamic bindings with #'flet will also not work when functions are accessed through their bytecodes.
author Aidan Kehoe <kehoea@parhasard.net>
date Wed, 07 Sep 2011 16:26:45 +0100
parents 308d34e9f07d
children
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/* Define X-specific scrollbar instance.
   Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.

This file is part of XEmacs.

XEmacs is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs.  If not, see <http://www.gnu.org/licenses/>. */

/* Synched up with: Not in FSF. */

#ifndef INCLUDED_scrollbar_x_h_
#define INCLUDED_scrollbar_x_h_

#if defined (HAVE_X_WINDOWS) && defined (HAVE_SCROLLBARS)

#include "scrollbar.h"

struct x_scrollbar_data
{
  /* Unique scrollbar identifier and name. */
  unsigned int id;
  char *name;

  /* Is set if we have already set the backing_store attribute correctly */
  char backing_store_initialized;

  /* Positioning and sizing information for scrollbar and slider. */
  scrollbar_values pos_data;

  /* Pointer to the scrollbar widget this structure describes. */
  Widget widget;

#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
    defined (LWLIB_SCROLLBARS_ATHENA3D)
  /* Recorded starting position for Motif-like scrollbar drags. */
  int vdrag_orig_value;
  Charbpos vdrag_orig_window_start;
#endif
};

#define SCROLLBAR_X_DATA(i) ((struct x_scrollbar_data *) ((i)->scrollbar_data))

#define SCROLLBAR_X_ID(i) (SCROLLBAR_X_DATA (i)->id)
#define SCROLLBAR_X_NAME(i) (SCROLLBAR_X_DATA (i)->name)
#define SCROLLBAR_X_BACKING_STORE_INITIALIZED(i) \
  (SCROLLBAR_X_DATA (i)->backing_store_initialized)
#define SCROLLBAR_X_POS_DATA(i) (SCROLLBAR_X_DATA (i)->pos_data)
#define SCROLLBAR_X_WIDGET(i) (SCROLLBAR_X_DATA (i)->widget)

#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
    defined (LWLIB_SCROLLBARS_ATHENA3D)
#define SCROLLBAR_X_VDRAG_ORIG_VALUE(i) \
  (SCROLLBAR_X_DATA (i)->vdrag_orig_value)
#define SCROLLBAR_X_VDRAG_ORIG_WINDOW_START(i) \
  (SCROLLBAR_X_DATA (i)->vdrag_orig_window_start)
#endif

void x_update_frame_scrollbars (struct frame *f);
void x_set_scrollbar_pointer (struct frame *f, Lisp_Object cursor);

#endif /* HAVE_X_WINDOWS and HAVE_SCROLLBARS */

#endif /* INCLUDED_scrollbar_x_h_ */