Joy Online Manual

NAME
objc:isNullObj - Check for null object pointer

SYNOPSIS

objc:isNullObj object

DESCRIPTION
Returns 1 if the given object is a NULL pointer to a Tcl_Obj, 0 otherwise. You can get the null object itself by writing [ItkObjCNullObj].

EXAMPLE

joy> objc:isNullObj [ItkObjCNullObj]
1

KEYWORDS
NULL, pointer, TclObj

Index