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

Subject: [boost] Rationale for shared_ptr/array including both ptr to control and ptr to data in class
From: Olaf van der Spek (ml_at_[hidden])
Date: 2011-09-23 07:43:33

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.

Greetings,

Olaf