[boost] [Block Pointer] Update

Subject: [boost] [Block Pointer] Update
From: Phil Bouchard (philippeb8_at_[hidden])
Date: 2016-03-09 23:28:24

Hi,

- So I've restructured all the code in the correct namespaces 
boost::smart_ptr & boost::smart_ptr::detail:
https://github.com/philippeb8/block_ptr/tree/master/include/boost/smart_ptr

- I am now using another smart pointer to refer to proxies because it is 
safer but the code is 15% slower than without it (now ~= shared_ptr<>):

make:
auto_ptr:                   26211292 ns
shared_ptr:                 27291607 ns
block_ptr:                  61097868 ns

new:
auto_ptr:                   23240569 ns
shared_ptr:                 48016207 ns
block_ptr:                  55554121 ns

- Because of the removal of the proxy optimization there is a new 
caveat; if you assign an rvalue (temporary pointer on the stack) to a 
pointer on the heap (opposite of normal heap object assigned to stack 
pointer) then there the behavior will be undefined.  I am looking to fix 
it or throw an exception but for now it's better not to use rvalues when 
assigning to pointer living on the heap as such:
https://github.com/philippeb8/block_ptr/blob/master/example/t100_test1.cpp#L32

Regards,
-Phil