undefinedp(3)         LPC Library Functions         undefinedp(3)

NAME
     undefinedp() - determine whether or not a given variable  is
     undefined.

SYNOPSIS
     int undefinedp( mixed arg );

DESCRIPTION
     Return 1 if `arg' is undefined.  'arg' will be undefined  in
     the following cases:

     1.   it is a variable set equal to the  return  value  of  a
          call_other   to  a  non-existent  method  (e.g.  arg  =
          call_other(obj, "???")).

     2.   it is a variable set equal to the return  value  of  an
          access  of  an  element in a mapping that doesn't exist
          (e.g. arg = map[not_there]).

SEE ALSO
     mapp(3), stringp(3), pointerp(3), objectp(3), intp(3),  buf-
     ferp(3), floatp(3), functionp(3), nullp(3), errorp(3)

MudOS                Last change: 5 Sep 1994                    1