Next: Creating Markers, Previous: Overview of Markers, Up: Markers [Contents][Index]

### 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.