Assigned() generates identical code to <> nil, and not Assigned() generates identical code to = nil. So take your pick.
Myself - I prefer to use Assigned() - treat it as an inlined compiler function - same applies to Pred(), Succ(), Inc() and Dec(). What really gets to me with Succ() and Pred() (Sometimes!) is that for enumeration types they do not wrap around - because they generate identical code to Inc() and Dec()!!!!! Myles. -----Original Message----- From: Neven MacEwan [mailto:[EMAIL PROTECTED]] Sent: Friday, 2 November 2001 3:05 p.m. To: Multiple recipients of list delphi Subject: Re: [DUG]: Best practice - To except or not Paul Thanks for the help, It would be great it assigned() worked wouldn't it Maybe there is a suggestion for borland in there This leads to another question, is 'assigned()' pref to '<> nil'?, is pred(count) better thasn Count-1? Actually thats inc(1) questions, or was that 1+1 questions It must be friday Neven ----- Original Message ----- From: "Paul Heinz" <[EMAIL PROTECTED]> To: "Multiple recipients of list delphi" <[EMAIL PROTECTED]> Sent: Friday, November 02, 2001 2:53 PM Subject: RE: [DUG]: Best practice - To except or not > Sandeep wrote: > > > > > This is better > > > > > > > > if Assigned (Datasource.DataSet.Connection) > > > > then Result := Datasource.DataSet.Connection; > > > > > > > > > if Datasource.Dataset is nil won't this raise > > > an exception? > > > > Conditon evaluates to false in that case > > In Delphi 5, you get an access violation since Assigned only tests the final > deref not the early one. Maybe it's changed in Delphi 6. > > TTFN, > Paul. > > > -------------------------------------------------------------------------- - > New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] > Website: http://www.delphi.org.nz > To UnSub, send email to: [EMAIL PROTECTED] > with body of "unsubscribe delphi" > Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/ > --------------------------------------------------------------------------- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz To UnSub, send email to: [EMAIL PROTECTED] with body of "unsubscribe delphi" Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/ --------------------------------------------------------------------------- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz To UnSub, send email to: [EMAIL PROTECTED] with body of "unsubscribe delphi" Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/
