[fpc-pascal] What's a unit?

[Mark Morgan Lloyd]

Sven Barth wrote:

>> OK, so is it possible to set up a constant extended record (i.e. the
>> work being done entirely at compilation time) that mimics an
>> instantiated object? Would
>>
>> if LibCapShim is TObject then
>> ..
>>
>> be safe where LibCapShim could be either an object (possibly nil) or a
>> constant extended record?
> 
> You could try to overload the "is" operator for your to be defined 
> static record [AFAIK it should work]. E.g.
> 
> === code begin ===
> 
> TLibCapShim = record
>   cap_get_proc: tcap_get_proc;
>   // ...
> 
>   class operator is (aLeft: TLibCapShim; aRight: TClass): Boolean; inline;
> end;
> 
> class operator TLibCapShim.Is(aLeft: TLibCapShim; aRight: TClass): Boolean;
> begin
>   Result := False;
> end;
> 
> === code end ===

Thanks Sven, looks interesting and I'll play with it presently. Can an 
extended record's fields/methods be set up at compilation time, or do 
they need to be done by code?

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]