;;; 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