OffsetOf Delphi ekvivalent?

[himitsu]

Delphi-Quellcode:

var x: record
         a: word;
         b: longword;
       end;

offset := Integer(@x.b) - Integer(@x);
// or
offset := Integer(@x.b) - Integer(@x.a);

found in http://www.delphipraxis.net/internal...ghlight=align*