Mercurial > hg > xemacs-beta
comparison lisp/prim/float-sup.el @ 0:376386a54a3c r19-14
Import from CVS: tag r19-14
| author | cvs |
|---|---|
| date | Mon, 13 Aug 2007 08:45:50 +0200 |
| parents | |
| children | ac2d302a0011 |
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| -1:000000000000 | 0:376386a54a3c |
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| 1 ;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime | |
| 2 | |
| 3 ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc. | |
| 4 | |
| 5 ;; Maintainer: FSF | |
| 6 ;; Keywords: internal | |
| 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, 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 23 | |
| 24 ;;; Synched up with: FSF 19.30. | |
| 25 | |
| 26 ;; Provide a meaningful error message if we are running on | |
| 27 ;; bare (non-float) emacs. | |
| 28 ;; Can't test for 'floatp since that may be defined by float-imitation | |
| 29 ;; packages like float.el in this very directory. | |
| 30 | |
| 31 (or (featurep 'lisp-float-type) | |
| 32 (error "Floating point was disabled at compile time")) | |
| 33 | |
| 34 ;; define pi and e via math-lib calls. (much less prone to killer typos.) | |
| 35 (defconst pi (purecopy (* 4 (atan 1))) "The value of Pi (3.1415926...)") | |
| 36 (defconst e (purecopy (exp 1)) "The value of e (2.7182818...)") | |
| 37 | |
| 38 ;; Careful when editing this file ... typos here will be hard to spot. | |
| 39 ;; (defconst pi 3.14159265358979323846264338327 | |
| 40 ;; "The value of Pi (3.14159265358979323846264338327...)") | |
| 41 | |
| 42 (defconst degrees-to-radians (purecopy (/ pi 180.0)) | |
| 43 "Degrees to radian conversion constant") | |
| 44 (defconst radians-to-degrees (purecopy (/ 180.0 pi)) | |
| 45 "Radian to degree conversion constant") | |
| 46 | |
| 47 ;; these expand to a single multiply by a float | |
| 48 ;; when byte compiled | |
| 49 | |
| 50 (defmacro degrees-to-radians (x) | |
| 51 "Convert ARG from degrees to radians." | |
| 52 (list '* (/ pi 180.0) x)) | |
| 53 (defmacro radians-to-degrees (x) | |
| 54 "Convert ARG from radians to degrees." | |
| 55 (list '* (/ 180.0 pi) x)) | |
| 56 | |
| 57 ;;; float-sup.el ends here |