Re: How to report user errors

[Toby <tobia conforto linux it>]

Jacob Kroon wrote:
> Let's say the container class had a method which would perform an
> operation on all of it's children, and that this operation could fail.
> If an error occures somewhere down in the hierarchy I wan't the caller
> to be notified, a message, and if it was a child who caused the error,
> report it too.

I would define a struct error, with a pointer (or name) of the object
that's raising the error condition, appropriate strings to hold messages
about the error, and an array of pointers to the struct errors of the
(direct) children that raised the error.  Which could have raised the
error themselves OR contain pointers to their children's struct errors.

All the methods return a pointer to their own struct error, or NULL if
no error occurred neither in their call nor in their children's.  The
top-level invocation could instead do the parsing of the struct error
tree and return something else more legible by the library's users.

Um, actually I would use Lisp instead of C, but I guess that's not the
answer you're looking for :-)


Toby

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