From: "Peter Dimov" <pdimov@[...].net> 
>  From: "Philippe A. Bouchard" <philippeb@[...].ca>
>  > Hi,
>  >
>  >     Here is the proof ptr<> is faster and requires a lot less memory
than
>  > shared_ptr<>.
>  >
>  >     The results speak from themselves:
>  > http://groups.yahoo.com/group/boost/files/ptr/
>  >
>  >     I know I don't take care of exceptions, but even with that the
numbers
>  > start doubling or quadrupling...
> 
>  Philippe, try using #define BOOST_DISABLE_THREADS to get a fair
comparison.
>  Looking at the times, I get the feeling that shared_ptr is using the
thread
>  safe path. Apologies if this is not the case.

Some more comments. Using <type_traits.h>  prevents ptr.h from working on
anything that doesn't use the SGI STL.

The implementation is pretty clever. I _think_ that the whole shared_ptr
spec can be implemented using your idea... if I were a standard library
implementor writing a std::shared_ptr I'd definitely consider using the
memory block header to store the data. :-)

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