
nullp(3)               C LIBRARY FUNCTIONS               nullp(3)

NAME
     nullp() - determine whether or not a given variable is null.

SYNOPSIS
     int nullp(mixed arg);

DESCRIPTION
     Return 1 if `arg' is null.  'arg' will be null in  the  fol-
     lowing cases:

     1.   it has not yet been initialized.

     2.   it points to a destructed object.

     3.   it is a function (formal) parameter that corresponds to
          a missing actual argument.

SEE ALSO
     undefinedp(3), mapp(3), stringp(3), pointerp(3), objectp(3),
     intp(3).

Sun Release 4.1           Last change:                          1

