Mercurial > hg > xemacs-beta

view lisp/float-sup.el @ 5252:378a34562cbe

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix style, documentation for rounding functions and multiple values. src/ChangeLog addition: 2010-08-30 Aidan Kehoe <kehoea@parhasard.net> * floatfns.c (ceiling_one_mundane_arg, floor_one_mundane_arg) (round_one_mundane_arg, truncate_one_mundane_arg): INTEGERP is always available, no need to wrap calls to it with #ifdef HAVE_BIGNUM. (Fceiling, Ffloor, Fround, Ftruncate, Ffceiling, Fffloor) (Ffround, Fftruncate): Correct some code formatting here. * doprnt.c (emacs_doprnt_1): Remove some needless #ifdef WITH_NUMBER_TYPES, now number.h is always #included. man/ChangeLog addition: 2010-08-30 Aidan Kehoe <kehoea@parhasard.net> * lispref/eval.texi (Evaluation, Multiple values): Document our implementation of multiple values; point the reader to the CLTL or the Hyperspec for details of exactly when values are discarded. * lispref/numbers.texi (Numeric Conversions): Document the optional DIVISOR arguments to the rounding functions, and document that they all return multiple values. (Rounding Operations): Ditto. * cl.texi (Multiple Values): Document that we've moved the multiple values implementation to core code, and cross-reference to the Lispref. (Numerical Functions): The various rounding functions are now identical to the built-in rounding functions, with the exception that they return lists, not multiple values; document this.
author Aidan Kehoe <kehoea@parhasard.net>
date Mon, 30 Aug 2010 15:23:42 +0100
parents 576fb035e263
children 308d34e9f07d
line wrap: on
line source

;;; 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