Standard Exceptions

Sue D. Nymme · Posted: Wed Jul 26, 2006 8:30 am Post subject: Standard Exceptions

Is there an existing hierarchy for standard exception classes? By "standard", I mean "exceptions that most every class programmer will need to throw from time to time." For example, exceptions dealing with function/method arguments, object state, and so on. I find myself writing the same sorts of exceptions over and over again, and it seems to me that it'd be easier to write code, and handle exceptions in other classes, if there's a standard hierarchy that everyone is comfortable using.

I am thinking that the following sorts of exceptions would fall into this category:

Argument Error
- Wrong number of arguments
  - Too many arguments
  - Too few arguments
- Argument out of bounds
  - Argument too large
  - Argument too small
- Wrong type of argument
- Nonsensical combination of arguments
Class Version error
- Feature is not implemented yet
- Feature is obsolete
Object state errors
- Object is in an inconsistent state
- Method not applicable to object's current state
- Argument not applicable to object's current state

and so on.

Operating system errors ("File not found", "Device busy", "Insufficient privileges", etc) would not fall into this general-purpose category, I think, because they should be defined by the module(s) that interface with the system (std.stream, std.stdio, etc).

Comments?
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sean · Joined: 24 Jun 2004 Posts: 609 Location: Bay Area, CA

I've thought about this a bit in the past for Ares but couldn't settle on a heirarchy I was completely happy with. But if you have any suggestions, feel free to post them in the Ares forum. I've been a bit busy with side-projects recently, but I plan to get to everything eventually Smile

brad · Posted: Wed Jul 26, 2006 8:54 am Post subject:

This is OT, but Sue needs to advise on what I do with this message from her mail server:

Sue D. Nymme · Posted: Wed Jul 26, 2006 9:21 am Post subject:

brad · Posted: Wed Jul 26, 2006 9:33 am Post subject:

well, you already had sdn.dlang but it may be admin@dsource.org that is sending the notifications that's the issue.

I went to the site and got sdn.lawful21064@zoemail.net if you want to use that. I just don't want to have to do this for every user, if ZoEmail catches on...

BA