X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/430d2ee2919b2d4693780f2474ba40148442d206..8a1f4a98c1b8e3abaf1b46394a88d09531ce4c2d:/lisp/emacs-lisp/float-sup.el

diff --git a/lisp/emacs-lisp/float-sup.el b/lisp/emacs-lisp/float-sup.el
index 299743cfe7..b5086e1d13 100644
--- a/lisp/emacs-lisp/float-sup.el
+++ b/lisp/emacs-lisp/float-sup.el
@@ -1,17 +1,18 @@
 ;;; 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
@@ -19,44 +20,33 @@
 ;; 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