Re: [boost] [ptr_container] abstraction penalty

From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2007-06-21 05:19:01

Michael Marcin skrev:
> Thorsten Ottosen wrote:
>> To my surprise, I could not eliminate the overhead with vc8 (/Ox /Og).
>> Thus the iterator wrapping seems to pay some penalty. This is quite
>> strange IMO.
>>
>> Perhaps it is not optimal for iterator_adaptor to return base() by
>> const&. Perhaps I'm doing something wrong. At any rate,
>> I would have assumed iteration to be optimal.
>>
>> I'll have to use some more time on this ... but thanks for pointing
>> out
>> the problem.
>>
> 
> The version I'm looking at is returning from base() by value but yes 
> returning by const reference also has no benefits (at least for RVCT).
> If you're testing on vc8 make sure you've disabled the checked iterators
> i.e. add _SECURE_SCL=0 to the preprocessor. 

Oh .. I didn't remember that. I'll try to recompile it with this turned on.

-Thorsten