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- ;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime
-
- ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
- ;; Keywords: internal
-
- ;; This file is part of XEmacs.
-
- ;; XEmacs is free software; you can redistribute it and/or modify it
- ;; under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; XEmacs is distributed in the hope that it will be useful, but
- ;; WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- ;; General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with XEmacs; see the file COPYING. If not, write to the Free
- ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- ;; 02111-1307, USA.
-
- ;;; Synched up with: FSF 19.34.
-
- ;;; Code:
-
- ;; Provide a meaningful error message if we are running on
- ;; bare (non-float) emacs.
- ;; Can't test for 'floatp since that may be defined by float-imitation
- ;; packages like float.el in this very directory.
-
- ;; XEmacs change
- (or (featurep 'lisp-float-type)
- (error "Floating point was disabled at compile time"))
-
- ;; define pi and e via math-lib calls. (much less prone to killer typos.)
- ;; XEmacs change (purecopy)
- (defconst pi (purecopy (* 4 (atan 1))) "The value of Pi (3.1415926...)")
- (defconst e (purecopy (exp 1)) "The value of e (2.7182818...)")
-
- ;; Careful when editing this file ... typos here will be hard to spot.
- ;; (defconst pi 3.14159265358979323846264338327
- ;; "The value of Pi (3.14159265358979323846264338327...)")
-
- ;; XEmacs change (purecopy)
- (defconst degrees-to-radians (purecopy (/ pi 180.0))
- "Degrees to radian conversion constant")
- (defconst radians-to-degrees (purecopy (/ 180.0 pi))
- "Radian to degree conversion constant")
-
- ;; these expand to a single multiply by a float when byte compiled
-
- (defmacro degrees-to-radians (x)
- "Convert ARG from degrees to radians."
- (list '* (/ pi 180.0) x))
- (defmacro radians-to-degrees (x)
- "Convert ARG from radians to degrees."
- (list '* (/ 180.0 pi) x))
-
- ;; Provided in C code in XEmacs
- ;; (provide 'lisp-float-type)
-
- ;;; float-sup.el ends here
-