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 16:26:24

On 26/04/12 22:08, Jeffrey Lee Hellrung, Jr. wrote:

> Doesn't the same thing happen in boost::optional and boost::variant?

Yes, their code is arguably ill-formed, but I'm sure some people claim 
otherwise.

AFAIK the only way to implement this in a standard conforming way is 
with C++11 unrestricted unions.
Alternatively, all compilers that implement strict aliasing provide 
attributes to allow aliasing locally.