nextMethodp

nextMethodp( 
) 
=> t / nil

Description

Checks if there is a next applicable method for the current method’s generic function. The current method is the method that is calling nextMethodp.

nextMethodp is a predicate function which returns t if there is a next applicable method for the current method’s generic function. This next method is specialized on a superclass of the class on which the current method is specialized.

Prerequisites

This function should only be used within the body of a method to determine whether a next method exists.

Arguments

None.

Value Returned

Examples

The following example prints Point.

defclass( GeometricObj () ()) 
=> t
defclass( Point ( GeometricObj ) () )
=> t
defmethod( whoami (( obj Point )) 
            if( nextMethodp() 
            then printf("Point, which is a " ) 
            callNextMethod()
            else printf("Point")))
=> t
p = makeInstance( 'Point ) 
=> stdobj:0x325030
whoami(p)
=> t

The following example prints Point, which is a “GeometricObj”

defmethod( whoami  (( obj GeometricObj)) 
                println( "GeometricObj"))
=> t
whoami( p)
=> nil

Related Topics

Generic Functions and Methods

defmethod

callNextMethod