;;; float-sup.el --- define some constants useful for floating point numbers.
;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
+;; Package: emacs
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
-;; Provide a meaningful error message if we are running on
-;; bare (non-float) emacs.
+;; 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 float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).")
+(defconst pi float-pi "Obsolete since Emacs-23.3. Use `float-pi' instead.")
-(if (fboundp 'atan)
- nil
- (error "Floating point was disabled at compile time"))
+(defconst float-e (exp 1) "The value of e (2.7182818...).")
-;; 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...).")
-
-(defconst degrees-to-radians (/ pi 180.0)
+(defconst degrees-to-radians (/ float-pi 180.0)
"Degrees to radian conversion constant.")
-(defconst radians-to-degrees (/ 180.0 pi)
+(defconst radians-to-degrees (/ 180.0 float-pi)
"Radian to degree conversion constant.")
-;; these expand to a single multiply by a float when byte compiled
+;; 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))
+ "Convert X from degrees to radians."
+ (list '* degrees-to-radians x))
(defmacro radians-to-degrees (x)
- "Convert ARG from radians to degrees."
- (list '* (/ 180.0 pi) x))
+ "Convert X from radians to degrees."
+ (list '* radians-to-degrees x))
(provide 'lisp-float-type)
-;;; arch-tag: e7837072-a4af-4d08-9953-8a3e755abf9d
;;; float-sup.el ends here