Re: [Threedsia-dev] Exceptions

[Marc H. <ax...@cu...>]

I  would propose a main dsia exception class from which all other exceptions 
derive, but the actual cases for exception uses have to be defined in a clean 
way, IMHO. I agree with Manfred that there are cases where exceptions are not 
that useful, but Kaltan's right, too, I think. I think they should be used 
instead of error codes, because through deriving one can easily decide 
whether the error code does interest me.
Example:
CException -> CFileException -> CFileNotFoundException
                                            |
                                            -> CFileNoPermissionException

My code could call a function 'foo' that throws a CFileNotFoundException, 
then I could choose to catch a CFileNotFoundException and try to do 
something, if that doesn't work I throw the exception further. The next catch 
would handle CFileException and display an error message, for example. If 
'foo' would throw a CFileNoPermissionException, then I would get at least an 
error message, if it throws a CFileNotFoundException my code would try to fix 
it, and if it didn't succeed I get an error message.
So exceptions _are_ necessary, and thought about that for weeks, but was too 
lazy to implement it :-)
	Marc
-- 
Marc Haisenko
The 3Dsia Project (http://threedsia.sourceforge.net)

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