I just wonder - why we have to use exceptions and exception handling so
often? I mean, why exceptions, not function results?
Because exceptions can be handled an the desired level while function
results must be handled at each level et propagated to the next one.
Structured exception handling is the way to go with OOP.
Personally... I hate exceptions...
That was my opinion in the beginning. I quickly reversed my opinion when I
understood how to benefit from the idea of structured exception handling.
--
[EMAIL PROTECTED]
http://www.overbyte.be
----- Original Message -----
From: "Piotr Hellrayzer Dałek" <[EMAIL PROTECTED]>
To: "TWSocket" <twsocket@elists.org>
Sent: Friday, July 01, 2005 12:03 AM
Subject: [twsocket] Why exceptions?
Hi!
I just wonder - why we have to use exceptions and exception handling so
often? I mean, why exceptions, not function results? For example:
procedure TNntpCli.List(DestStream : TStream);
begin
if FState <> nntpReady then
raise NntpException.Create('Not ready for LIST');
FDataStream := DestStream;
FRequestType := nntpList;
FRequest := 'LIST NEWSGROUPS';
FNext := GetArticleNext;
StateChange(nntpWaitingResponse);
SendRequest;
end;
Why not change it to
function TNntpCli.List(DestStream : TStream): boolean
begin
if FState <> nntpReady then
result:=false
else
begin;
FDataStream := DestStream;
FRequestType := nntpList;
FRequest := 'LIST NEWSGROUPS';
FNext := GetArticleNext;
StateChange(nntpWaitingResponse);
SendRequest;
result:=true;
end
end;
Currently, when exception is raised, sometimes I don't know if the
exception
was raised in TWSocket, or TNntpCli (and I know that I could find that
out by checking exception class, but sometimes exception is raised not
because broken program logic, but because - for example - broken
connection)
and I'm forced to use procedure-global exception handlers, or else I'll
end with a hell-lot of small exception handlers that would give me a bit
more info about what went wrong, but also complicate, enlarge and slow
down
RequestDone procedures (which have to handle >10000 - yes, over ten
thousand
- RequestDones per connection).
Personally... I hate exceptions...
--
Piotr "Hellrayzer" Dalek
Author of ICS-Based Hellcore Mailer - an Outlook Express killer
http://www.hcm.prv.pl
[EMAIL PROTECTED]
----------------------------------------------------------------------
Startuj z INTERIA.PL! >>> http://link.interia.pl/f186c
--
To unsubscribe or change your settings for TWSocket mailing list
please goto http://www.elists.org/mailman/listinfo/twsocket
Visit our website at http://www.overbyte.be
--
To unsubscribe or change your settings for TWSocket mailing list
please goto http://www.elists.org/mailman/listinfo/twsocket
Visit our website at http://www.overbyte.be
