Can we implement ANSI C's `offsetof` in Delphi?

Question

For reference: The offsetof macro(!) takes a struct data type and a member of the specified struct as arguments and returns an integer offset of th

Answer 1

Without a pre-processor or a built-in function, there's no way to do it quite as cleanly as the offsetof macro. The way that offsetof is able to do it so cleanly is that the pre-processor does the work. In fact some compilers implement it as a built-in, but that's beside the point. Delphi has no pre-processor, and no built-in offsetof.

The cleanest solution I know is like this:

NativeUInt(@TMyRecord(nil^).MyField)

But that is nothing like as clean as

offsetof(struct MyStruct, MyField)