Re: [boost] Re: Next revision of boost::thread & OS error code.

From: David Abrahams (dave_at_[hidden])
Date: 2003-01-13 15:29:39

"William E. Kempf" <wekempf_at_[hidden]> writes:

> David Abrahams said:
>> "William E. Kempf" <wekempf_at_[hidden]> writes:
>>
>>>> People said they wanted it, and the cost is low (one int). I think
>>>> Greg is  right that they wanted to attempt system-dependent recovery.
>>>
>>> Well, I can agree that the cost is low... so I won't argue too much
>>> about including it.  I just want to feel comfortable with the
>>> rationale.
>>
>> I think a rationale goes like this:
>>
>> suppose the platform gives you a function for converting an error code
>> into an error message (realistic, I think).  How much code do you have
>> to write in order to take advantage of it?
>
> Contrasted with, "If a platform has the ability, the error is translated
> into a message that's returned as part of what()."  That's where I feel
> uncomfortable with the reationale.

Remember that it's a bad idea to carry dynamically-allocated state in
an exception object.  Translating to readable strings at the throw
point is ill-advised.

-- 
                       David Abrahams
   dave_at_[hidden] * http://www.boost-consulting.com
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