;;; float-sup.el --- define some constants useful for floating point numbers.
-;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+;; Copyright (C) 1985-1987, 2001-2011 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
;;; 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.)
+;; 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.")
+(progn
+ ;; Simulate a defconst that doesn't declare the variable dynamically bound.
+ (setq-default pi float-pi)
+ (put 'pi 'variable-documentation
+ "Obsolete since Emacs-23.3. Use `float-pi' instead.")
+ (put 'pi 'risky-local-variable t)
+ (push 'pi current-load-list))
(defconst float-e (exp 1) "The value of e (2.7182818...).")
(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 X from degrees to radians."
(provide 'lisp-float-type)
-;; arch-tag: e7837072-a4af-4d08-9953-8a3e755abf9d
;;; float-sup.el ends here