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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: contracted exceptions
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Date: Sat, 9 Jun 2007 10:21:29 +0200
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Date: 2007-06-09T10:21:10+02:00
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On Fri, 08 Jun 2007 20:15:03 +0100, Simon Wright wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> Software and more narrowly exceptions cannot report own bugs. It
>> would be a very bad idea to exceptions for that, because vital
>> information about the reasons will be inevitably destroyed. The best
>> possible way is to break into debugger, stopping everything else.
> 
> I don't really understand the first sentence of this ..

When the program has a bug, then it could be anything, including reporting
another or non-existing bug, raising exceptions (false positive), not
raising exception (false negative), whatever.

Let the probability of a program state where it would have a false positive
be sufficiently greater than the probability of the states with false
negative. Then it is better not to report anything!

What is known about these probabilities?

> The operator has no access to or interest in a debugger.

It is all about having another system monitoring the system one. The best
possible secondary system is a programmer with an IDE. An operator comes
next.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de