[boost] Re: Re: Performance: shared_ptr

From: Matthew Wilson (stlsoft_at_[hidden])
Date: 2003-11-17 16:56:53

"Beman Dawes" <bdawes_at_[hidden]> wrote in message
news:4.3.2.7.2.20031117154641.01420dd0_at_mailhost.esva.net...
> At 02:49 PM 11/17/2003, Matthew Wilson wrote:
>
>  >> > [As a side question, is it true that Nicolai Josuttis was the
>  >> > inventor of the technique?]
>  >>
>  >> Which specific technique do you have in mind?
>  >
>  >Not the general principle of having the reference-count external to the
>  >counted type, but the specific technique of having it a heap-allocated
>  >(integer) instance. That seems, to me anyway, the essence of the
>  >shared_ptr,
>  >and the bit that's conceptually beautiful (albeit potentially slightly
>  >inefficient).
>
> Greg Colvin invented that technique, AFAIK. The template used to be called
> counted_ptr.
>
> See the second page of
> http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/1994/N0555.pdf for a paper
> Greg wrote in 1994. I think there was also an earlier paper by him, but
I'm
> not able to find a copy.

Nice one.

Thanks for that

Matthew