ISREF

state = ISREF( var-name AS REFERENCE ) AS INTEGER

Returns TRUE (1) if the var-name is a valid address/pointer.  This is the same as "return ( pRef != NULL )" in C/C++.

Example:

DIM ptr AS REFERENCE

DIM nils AS INTEGER

ptr = REF( nils )

n = ISREF( ptr ) ' Returns 1 (TRUE)