Mercurial > hg > xemacs-beta
annotate lisp/float-sup.el @ 5894:23178aa71f8b
Define ALIGNOF using C11 and C++11 operators.
See <CAHCOHQmG51R61KwGUNY7T5t9tXxzbyg=aGijUKYstbE+wL2-6Q@mail.gmail.com> in
xemacs-patches for more information.
| author | Jerry James <james@xemacs.org> |
|---|---|
| date | Mon, 20 Apr 2015 15:09:11 -0600 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 209 | 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 | |
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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 the |
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12 ;; Free Software Foundation, either version 3 of the License, or (at your |
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13 ;; option) any later version. |
| 209 | 14 |
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15 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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16 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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17 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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18 ;; for more details. |
| 209 | 19 |
| 20 ;; You should have received a copy of the GNU General Public License | |
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21 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 209 | 22 |
| 23 ;;; Synched up with: FSF 19.34. | |
| 24 | |
| 25 ;;; Code: | |
| 26 | |
| 27 ;; This file is dumped with XEmacs. | |
| 28 | |
| 29 ;; Provide a meaningful error message if we are running on | |
| 30 ;; bare (non-float) emacs. | |
| 31 ;; Can't test for 'floatp since that may be defined by float-imitation | |
| 32 ;; packages like float.el in this very directory. | |
| 33 | |
| 34 ;; XEmacs change | |
| 35 (or (featurep 'lisp-float-type) | |
| 36 (error "Floating point was disabled at compile time")) | |
| 37 | |
| 38 ;; define pi and e via math-lib calls. (much less prone to killer typos.) | |
| 444 | 39 (defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...)") |
| 40 (defconst e (exp 1) "The value of e (2.7182818...)") | |
| 209 | 41 |
| 42 ;; Careful when editing this file ... typos here will be hard to spot. | |
| 43 ;; (defconst pi 3.14159265358979323846264338327 | |
| 44 ;; "The value of Pi (3.14159265358979323846264338327...)") | |
| 45 | |
| 444 | 46 (defconst degrees-to-radians (/ pi 180.0) |
| 209 | 47 "Degrees to radian conversion constant") |
| 444 | 48 (defconst radians-to-degrees (/ 180.0 pi) |
| 209 | 49 "Radian to degree conversion constant") |
| 50 | |
| 51 ;; these expand to a single multiply by a float when byte compiled | |
| 52 | |
| 53 (defmacro degrees-to-radians (x) | |
| 54 "Convert ARG from degrees to radians." | |
| 55 (list '* (/ pi 180.0) x)) | |
| 56 (defmacro radians-to-degrees (x) | |
| 57 "Convert ARG from radians to degrees." | |
| 58 (list '* (/ 180.0 pi) x)) | |
| 59 | |
| 60 ;; Provided in C code in XEmacs | |
| 61 ;; (provide 'lisp-float-type) | |
| 62 | |
| 63 ;;; float-sup.el ends here |