www.delorie.com/gnu/docs/elisp-manual-21/elisp_486.html   search  
 
Buy the book!


GNU Emacs Lisp Reference Manual

[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

31.2 Predicates on Markers

You can test an object to see whether it is a marker, or whether it is either an integer or a marker. The latter test is useful in connection with the arithmetic functions that work with both markers and integers.

Function: markerp object
This function returns t if object is a marker, nil otherwise. Note that integers are not markers, even though many functions will accept either a marker or an integer.

Function: integer-or-marker-p object
This function returns t if object is an integer or a marker, nil otherwise.

Function: number-or-marker-p object
This function returns t if object is a number (either integer or floating point) or a marker, nil otherwise.


  webmaster   donations   bookstore     delorie software   privacy  
  Copyright 2003   by The Free Software Foundation     Updated Jun 2003