.\"determine whether or not a given variable is null. .TH nullp 3 "5 Sep 1994" MudOS "LPC Library Functions" .SH NAME nullp() - determine whether or not a given variable is null. .SH SYNOPSIS int nullp( mixed arg ); .SH DESCRIPTION Return 1 if `arg' is null. 'arg' will be null in the following cases: .TP 1. it has not yet been initialized. .TP 2. it points to a destructed object. .TP 3. it is a function (formal) parameter that corresponds to a missing actual argument. .SH SEE ALSO mapp(3), stringp(3), pointerp(3), objectp(3), intp(3), bufferp(3), floatp(3), functionp(3), undefinedp(3), errorp(3)