The Right Approach to Exceptions

Andrei Alexandrescu SeeWebsiteForEmail at
Tue Feb 21 12:06:15 PST 2012

On 2/21/12 12:03 PM, Jacob Carlborg wrote:
> On 2012-02-21 17:57, Andrei Alexandrescu wrote:
>> On 2/21/12 10:50 AM, Juan Manuel Cabo wrote:
>>> I thought that an alternative to Variant[string] would be to have some
>>> virtual
>>> functions overrideable (getExceptionData(string dataName) or something).
>>> but they would all have to return Object or Variant, so it's the same
>>> thing.
>> Exactly. By and large, I think in the fire of the debate too many people
>> in this thread have forgotten to apply a simple OO design principle:
>> push policy up and implementation down. Any good primitive pushed up the
>> exception hierarchy is a huge win, and any design that advocates
>> reliance on concrete types is admitting defeat.
>> Andrei
> That because you can't (shouldn't) push up implementations specific to a
> given subclass. Why don't we only have one class, Object, and add a
> Variant[string] there.
> Do you see how stupid that is.

I think I do. It's also fair to ask you if you are sure you understood 
my point.


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