I am wondering what the current thinking is on what memory models
C++ will support in the future. In particular, last fall, on Artima,
Chuck Allison asked for suggested updates for C++. I wrote the
following, and I would like to know what people are thinking about
these issues.

--- Glenn G. Chappell wrote (on Artima):
> (1) Consider making a statement about what kinds of memory
> models C++ will support.
>
> Example: I have been involved a number of projects in which
> multiple processes had their own static spaces, but all had
> access to a shared arena. It seems the world is moving away from
> this, toward the multi-threaded model, in which every thread has
> the same static space.
>
> I don't have a problem with this move. But consider: I could
> make an STL container accessible to all processes by putting it
> in the shared arena and giving it a shared-memory allocator.
> However, I cannot use the Boost shared_ptr in this context,
> since it does dynamic allocation, but does not allow me to
> specify an allocator.
>
> I am not saying the Boost shared_ptr is "bad" (on the contrary,
> I think it is very much needed). I am saying that we need to
> think about things like this. Do we intend to support every
> memory model under the sun? If so, then any shared_ptr that gets
> added to the Standard Library needs to allow specification of an
> allocator. If not, then we should make a explicit statement
> about what memory models the Standard Library is intended to
> support.

--
Glenn G. Chappell          <><
Dept. of Mathematical Sciences
University of Alaska Fairbanks

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