Mercurial > hg > xemacs-beta
comparison lisp/float-sup.el @ 209:41ff10fd062f r20-4b3
Import from CVS: tag r20-4b3
| author | cvs |
|---|---|
| date | Mon, 13 Aug 2007 10:04:58 +0200 |
| parents | |
| children | 576fb035e263 |
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| 208:f427b8ec4379 | 209:41ff10fd062f |
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| 1 ;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime | |
| 2 | |
| 3 ;; Copyright (C) 1985-7, 1997 Free Software Foundation, Inc. | |
| 4 | |
| 5 ;; Maintainer: FSF | |
| 6 ;; Keywords: internal, dumped | |
| 7 | |
| 8 ;; This file is part of XEmacs. | |
| 9 | |
| 10 ;; XEmacs is free software; you can redistribute it and/or modify it | |
| 11 ;; under the terms of the GNU General Public License as published by | |
| 12 ;; the Free Software Foundation; either version 2, or (at your option) | |
| 13 ;; any later version. | |
| 14 | |
| 15 ;; XEmacs is distributed in the hope that it will be useful, but | |
| 16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 18 ;; General Public License for more details. | |
| 19 | |
| 20 ;; You should have received a copy of the GNU General Public License | |
| 21 ;; along with XEmacs; see the file COPYING. If not, write to the Free | |
| 22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
| 23 ;; 02111-1307, USA. | |
| 24 | |
| 25 ;;; Synched up with: FSF 19.34. | |
| 26 | |
| 27 ;;; Code: | |
| 28 | |
| 29 ;; This file is dumped with XEmacs. | |
| 30 | |
| 31 ;; Provide a meaningful error message if we are running on | |
| 32 ;; bare (non-float) emacs. | |
| 33 ;; Can't test for 'floatp since that may be defined by float-imitation | |
| 34 ;; packages like float.el in this very directory. | |
| 35 | |
| 36 ;; XEmacs change | |
| 37 (or (featurep 'lisp-float-type) | |
| 38 (error "Floating point was disabled at compile time")) | |
| 39 | |
| 40 ;; define pi and e via math-lib calls. (much less prone to killer typos.) | |
| 41 ;; XEmacs change (purecopy) | |
| 42 (defconst pi (purecopy (* 4 (atan 1))) "The value of Pi (3.1415926...)") | |
| 43 (defconst e (purecopy (exp 1)) "The value of e (2.7182818...)") | |
| 44 | |
| 45 ;; Careful when editing this file ... typos here will be hard to spot. | |
| 46 ;; (defconst pi 3.14159265358979323846264338327 | |
| 47 ;; "The value of Pi (3.14159265358979323846264338327...)") | |
| 48 | |
| 49 ;; XEmacs change (purecopy) | |
| 50 (defconst degrees-to-radians (purecopy (/ pi 180.0)) | |
| 51 "Degrees to radian conversion constant") | |
| 52 (defconst radians-to-degrees (purecopy (/ 180.0 pi)) | |
| 53 "Radian to degree conversion constant") | |
| 54 | |
| 55 ;; these expand to a single multiply by a float when byte compiled | |
| 56 | |
| 57 (defmacro degrees-to-radians (x) | |
| 58 "Convert ARG from degrees to radians." | |
| 59 (list '* (/ pi 180.0) x)) | |
| 60 (defmacro radians-to-degrees (x) | |
| 61 "Convert ARG from radians to degrees." | |
| 62 (list '* (/ 180.0 pi) x)) | |
| 63 | |
| 64 ;; Provided in C code in XEmacs | |
| 65 ;; (provide 'lisp-float-type) | |
| 66 | |
| 67 ;;; float-sup.el ends here |