Re: [boost] [Smart Ptr] make_shared slower than shared_ptr(new) on VC++9 (and 10) with fix

Subject: Re: [boost] [Smart Ptr] make_shared slower than shared_ptr(new) on VC++9 (and 10) with fix
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-04-26 16:06:26

On 26/04/12 19:41, Dave Abrahams wrote:
>
> on Thu Apr 26 2012, "Stephan T. Lavavej"<stl-AT-exchange.microsoft.com>  wrote:
>
>> [STL]
>>> Each is optimally sized (in particular, make_shared/allocate_shared
>>> implement the "we know where you live" optimization that I have
>>> previously described
>>
>> [Dave Abrahams]
>>> I can't find that description.  Pointer please?
>>
>> See
>> http://channel9.msdn.com/Events/GoingNative/GoingNative-2012/STL11-Magic-Secrets
>> (which also has links to my slides - viewable online even without
>> PowerPoint), in particular Slide 6.
>
> 9:30 or so in the video.

Explicit destructor calls on memory that doesn't come from the free store?

Sounds like there are potential strict aliasing problems there.