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elisp: Predicates on Markers

 
 30.2 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.
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