[Emacs-diffs] Changes to emacs/lisp/emacs-lisp/float-sup.el [lexbind]

[Miles Bader]

Index: emacs/lisp/emacs-lisp/float-sup.el
diff -c /dev/null emacs/lisp/emacs-lisp/float-sup.el:1.2.2.1
*** /dev/null   Tue Oct 14 19:32:25 2003
--- emacs/lisp/emacs-lisp/float-sup.el  Tue Oct 14 19:32:21 2003
***************
*** 0 ****
--- 1,64 ----
+ ;;; float-sup.el --- define some constants useful for floating point numbers.
+ 
+ ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
+ 
+ ;; Maintainer: FSF
+ ;; Keywords: internal
+ 
+ ;; This file is part of GNU Emacs.
+ 
+ ;; GNU Emacs 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.
+ 
+ ;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;;; Code:
+ 
+ ;; Provide a meaningful error message if we are running on
+ ;; bare (non-float) emacs.
+ 
+ (if (fboundp 'atan)
+     nil
+   (error "Floating point was disabled at compile time"))
+ 
+ ;; provide an easy hook to tell if we are running with floats or not.
+ ;; 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...).")
+ ;; It's too inconvenient to make `e' a constant because it's used as
+ ;; a temporary variable all the time.
+ (defvar 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))
+ 
+ (provide 'lisp-float-type)
+ 
+ ;;; arch-tag: e7837072-a4af-4d08-9953-8a3e755abf9d
+ ;;; float-sup.el ends here