G'day Alexander,

As per the original question, I focussed on the interface rather than the implementation. I did, however, leave some clues but I didn't expand upon them.

When I said "I would assume your error objects are instantiated from classes with appropriate information; for example, a RangeError class has min and max attributes.", I was thinking that myroutine() might look something like: 

sub myroutine {
    ...

    if ($n < 5 or $n > 10) {
        die RangeError::->new(min => 5, max => 10, got => $n, ...);   
+ 
    }

    ...
}

[download]

Then a generic $dispatch_error{RangeError} routine would have sufficient information to generate an error message. That might look something like: 

ERROR: Out of bounds. The allowed range is $e->min() to $e->max() (inc
+lusive). The number received was $e->got().

[download]

The RangeError class might even have some boilerplate to create such a message using the attribute values of the error object.

My main intent was to suggest an interface with "an easy syntax" (as requested) and to decouple the implementation. I hadn't really given the implementation details much thought; however, what I've described above, is roughly what had in the back of my mind.

— Ken

In reply to Re^3: conditional catch-blocks 'try {} catch(COND) { }' by kcott
in thread conditional catch-blocks 'try {} catch(COND) { }' by LanX

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