annotate lisp/float-sup.el @ 5096:e0587c615e8b

Updates to internals.texi -------------------- ChangeLog entries follow: -------------------- man/ChangeLog addition: 2010-03-04 Ben Wing <ben@xemacs.org> * internals/internals.texi (Top): * internals/internals.texi (list-to-texinfo): Removed. * internals/internals.texi (convert-list-to-texinfo): New. * internals/internals.texi (table-to-texinfo): Removed. * internals/internals.texi (convert-table-to-texinfo): New. Update Lisp functions at top to newest versions. * internals/internals.texi (A History of Emacs): * internals/internals.texi (Through Version 18): * internals/internals.texi (Lucid Emacs): * internals/internals.texi (XEmacs): * internals/internals.texi (The XEmacs Split): * internals/internals.texi (Modules for Other Aspects of the Lisp Interpreter and Object System): * internals/internals.texi (Introduction to Writing C Code): * internals/internals.texi (Writing Good Comments): * internals/internals.texi (Writing Macros): * internals/internals.texi (Major Textual Changes): * internals/internals.texi (Great Integral Type Renaming): * internals/internals.texi (How to Regression-Test): * internals/internals.texi (Creating a Branch): * internals/internals.texi (Dynamic Arrays): * internals/internals.texi (Allocation by Blocks): * internals/internals.texi (mark_object): * internals/internals.texi (gc_sweep): * internals/internals.texi (Byte-Char Position Conversion): * internals/internals.texi (Searching and Matching): * internals/internals.texi (Introduction to Multilingual Issues #3): * internals/internals.texi (Byte Types): * internals/internals.texi (Different Ways of Seeing Internal Text): * internals/internals.texi (Buffer Positions): * internals/internals.texi (Basic internal-format APIs): * internals/internals.texi (The DFC API): * internals/internals.texi (General Guidelines for Writing Mule-Aware Code): * internals/internals.texi (Mule-izing Code): * internals/internals.texi (Locales): * internals/internals.texi (More about code pages): * internals/internals.texi (More about locales): * internals/internals.texi (Unicode support under Windows): * internals/internals.texi (The Frame): * internals/internals.texi (The Non-Client Area): * internals/internals.texi (The Client Area): * internals/internals.texi (The Paned Area): * internals/internals.texi (Text Areas): * internals/internals.texi (The Displayable Area): * internals/internals.texi (Event Queues): * internals/internals.texi (Event Stream Callback Routines): * internals/internals.texi (Focus Handling): * internals/internals.texi (Future Work -- Autodetection): Replace " with ``, '' (not complete, maybe about halfway through).
author Ben Wing <ben@xemacs.org>
date Thu, 04 Mar 2010 07:19:03 -0600
parents 576fb035e263
children 308d34e9f07d
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1 ;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime
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2
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3 ;; Copyright (C) 1985-7, 1997 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: internal, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Code:
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28
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29 ;; This file is dumped with XEmacs.
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30
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31 ;; Provide a meaningful error message if we are running on
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32 ;; bare (non-float) emacs.
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33 ;; Can't test for 'floatp since that may be defined by float-imitation
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34 ;; packages like float.el in this very directory.
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35
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36 ;; XEmacs change
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37 (or (featurep 'lisp-float-type)
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38 (error "Floating point was disabled at compile time"))
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39
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40 ;; define pi and e via math-lib calls. (much less prone to killer typos.)
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41 (defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...)")
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42 (defconst e (exp 1) "The value of e (2.7182818...)")
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43
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44 ;; Careful when editing this file ... typos here will be hard to spot.
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45 ;; (defconst pi 3.14159265358979323846264338327
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46 ;; "The value of Pi (3.14159265358979323846264338327...)")
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47
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48 (defconst degrees-to-radians (/ pi 180.0)
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49 "Degrees to radian conversion constant")
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50 (defconst radians-to-degrees (/ 180.0 pi)
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51 "Radian to degree conversion constant")
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52
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53 ;; these expand to a single multiply by a float when byte compiled
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54
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55 (defmacro degrees-to-radians (x)
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56 "Convert ARG from degrees to radians."
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57 (list '* (/ pi 180.0) x))
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58 (defmacro radians-to-degrees (x)
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59 "Convert ARG from radians to degrees."
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60 (list '* (/ 180.0 pi) x))
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61
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62 ;; Provided in C code in XEmacs
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63 ;; (provide 'lisp-float-type)
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64
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65 ;;; float-sup.el ends here