Re: [boost] Rationale for shared_ptr/array including both ptr to control and ptr to data in class

On 23.09.2011 13:43, Olaf van der Spek wrote:

Hi,

I was wondering why shared_ptr/array include both a ptr to the control block and a ptr to the data (ptr) in the class itself. I assume it's for performance reasons, but I didn't find anything about that in the docs.

It's for aliasing. You can have a shared_ptr that points to a subobject of the object controlled by the control block. Sebastian