[boost] Re: Standard C Library and C++ / BOOST

From: David Abrahams (dave_at_[hidden])
Date: 2004-03-30 12:47:23

Gennaro Prota <gennaro_prota_at_[hidden]> writes:

>>> Careful. Throwing an exception from a constructor
>>> means that the object won't be constructed (i. e., does not exist).
>>> So you are throwing a non-existing object here.
>>>
>>> Or am I wrong?
>>
>>You're wrong.  *this is copied before it is thrown.  Still, the idiom
>>above seems a bit suspicious, unless you somehow prevent derivation
>>from errorcheck.
>
> I can't believe you are justifying the above. 

I'm not justifying it.  I'm simply disagreeing with "you're throwing
a non-existing object here".  OK, construction has not yet completed,
so it's a dubious practice, but the object surely exists at the point
of the throw.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com