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;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime
;; Copyright (C) 1985-7, 1997 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal, dumped
;; 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:
;; This file is dumped with XEmacs.
;; 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.)
(defconst pi (* 4 (atan 1)) "The value of Pi (3.1415926...)")
(defconst e (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...)")
(defconst degrees-to-radians (/ pi 180.0)
"Degrees to radian conversion constant")
(defconst radians-to-degrees (/ 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
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