True, but as Joylon correctly points out, you can (in the VCL) actually cater for the difference in a "real" index out of bounds error and a LongInt(TObject) typecase returning -1.
It's a bug and should be logged on QC, if it isn't there already. On Tue, Feb 16, 2010 at 12:50 PM, Kyley Harris <ky...@harrissoftware.com> wrote: > interesting >> if Longint(Result) = LB_ERR then Error(SListIndexError, Index); > it would seem that the error is not in delphi at all. Well.. they are simply > raising the Windows error which say that -1 is the error result for a bad > index access from windows. if delphi were to ignore this error and you asked > for the value at index[99] which was out of bounds and you got -1 instead of > an error I think there would be the same number of complaints from the other > side. > Clearly its the windows API that considers -1 invalid.. not delphi. > > On Tue, Feb 16, 2010 at 2:24 PM, Karl Reynolds > <kreyno...@chocfishsoft.co.nz> wrote: >> >> On Tue, Feb 16, 2010 at 1:55 PM, Alister Christie >> <alis...@salespartner.co.nz> wrote: >> > I think the point I was trying to make is that it is that the method >> > (/array indexer or whatever) was expecting a TObject - passing anything >> > else could result in unexpected results. >> >> Only if you stipulate that you have to remain ignorant of the function >> internals. The TObject is converted back and forth from a LongInt in >> order to store it anyway (see GetObject and PutObject). >> >> > The fact that -1 doesn't work >> > is therefor not a bug (unless you can have 1 byte sized objects). >> >> var x: longint; >> >> x := -1; // Four bytes >> >> (May the source be with you). >> >> Cheer, >> Karl >> _______________________________________________ >> NZ Borland Developers Group - Delphi mailing list >> Post: delphi@delphi.org.nz >> Admin: http://delphi.org.nz/mailman/listinfo/delphi >> Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: >> unsubscribe > > > > -- > Kyley Harris > Harris Software > +64-21-671-821 > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe > _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe
