Re: When to raise predefined exceptions (was: Ada and the Automotive Industry)

[James Rogers <jrogers@velveeta.apdev.cs.mci.com>]

Ted Dennison wrote:

> I guess that is what I was getting at. There have been times where I
> wanted to consider certian values out of range for a type, but the only
> way to do it was to explicitly check for those values. It seemed
> pointless to create a new exception to raise, when any reasonable
> handler for this situation would just have to handle *both*
> Constraint_Error and my new exception.
>

I see your point, however it is possible to design away this
problem by handling CE in the subprogram in which it is raised by
raising your new exception.  This way calling subprograms would only
encounter your new exception.  If you use Ada.Exceptions you can
indicate what really happened in the Exception_Information string.
The handler for your new exception could direct its behavior based
upon both the exception name and the exception information, if such
fine control were deemed necessary.

-- 
Jim Rogers
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Team Ada