1 ;;; float-sup.el --- detect absence of floating-point support in SXEmacs runtime
3 ;; Copyright (C) 1985-7, 1997 Free Software Foundation, Inc.
6 ;; Keywords: internal, dumped
8 ;; This file is part of SXEmacs.
10 ;; SXEmacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; SXEmacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with this program. If not, see <http://www.gnu.org/licenses/>.
23 ;;; Synched up with: FSF 19.34.
27 ;; This file is dumped with SXEmacs.
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.
35 (or (featurep 'lisp-float-type)
36 (error "Floating point was disabled at compile time"))
38 ;; define pi and e via math-lib calls. (much less prone to killer typos.)
39 (unless (featurep 'bigfr)
40 (defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...)")
41 (defconst e (exp 1) "The value of e (2.7182818...)"))
43 ;; Careful when editing this file ... typos here will be hard to spot.
44 ;; (defconst pi 3.14159265358979323846264338327
45 ;; "The value of Pi (3.14159265358979323846264338327...)")
47 (unless (featurep 'bigfr)
48 (defconst degrees-to-radians (/ pi 180.0)
49 "Degrees to radian conversion constant")
50 (defconst radians-to-degrees (/ 180.0 pi)
51 "Radian to degree conversion constant"))
53 ;; these expand to a single multiply by a float when byte compiled
55 (defmacro degrees-to-radians (x)
56 "Convert ARG from degrees to radians."
57 (list '* (/ pi 180.0) x))
58 (defmacro radians-to-degrees (x)
59 "Convert ARG from radians to degrees."
60 (list '* (/ 180.0 pi) x))
62 ;; Provided in C code in XEmacs
63 ;; (provide 'lisp-float-type)
67 ;;; float-sup.el ends here