Re: [boost] [function]functionwrappingwithnoexceptionsafetyguarantee

Subject: Re: [boost] [function]functionwrappingwithnoexceptionsafetyguarantee
From: Domagoj Saric (dsaritz_at_[hidden])
Date: 2010-11-08 19:24:26

"Daniel Walker" <daniel.j.walker_at_[hidden]> wrote in message 
news:AANLkTinCj3avcSZtfm9jcCBfmcDVDbSyf4Cu8ZktumwY_at_mail.gmail.com...
>> On Sat, Nov 6, 2010 at 7:53 PM, Peter Dimov <pdimov_at_[hidden]> wrote:
>>> This is a special case: all targets are function pointers of the same
>>> type, right?
>>
>> No. It's enough for one of them to be.
>
> Oh, I see, if the user ever assigns a function pointer target, then
> you can reuse the vtable from the empty target. OK, that's a
> reasonable optimization, but it doesn't decrease the upper bound on
> space overhead, which is reached when no user-assigned target has the
> same type as the empty target.

That is not an optimization, it is just the correct way to do it and the way 
the current boost::function implementation already functions...

-- 
"What Huxley teaches is that in the age of advanced technology, spiritual
devastation is more likely to come from an enemy with a smiling face than
from one whose countenance exudes suspicion and hate."
Neil Postman