Re: [boost] [container] Implemented Polymorphic Memory Resources

Subject: Re: [boost] [container] Implemented Polymorphic Memory Resources
From: Klaim - Joël Lamotte (mjklaim_at_[hidden])
Date: 2015-09-07 19:56:58

On 7 September 2015 at 22:23, Ion Gaztañaga <igaztanaga_at_[hidden]> wrote:

> Hi to all,
>
> In case anyone is interested, I just committed to the develop branch the
> implementation of the proposal "N3916 Polymorphic Memory Resources - r2"
> that was included in the TS "C++ Extensions for Library Fundamentals". The
> library continues to support C++03 compilers.
>
> It basically introduces in namespace boost::container::pmr and the path
> boost/container/pmr/:
>
> - memory_resource
> - synchronized_pool_resource
> - unsynchronized_pool_resource
> - monotonic_buffer_resource
> - polymorphic_allocator
> - resource_adaptor
> - new_delete_resource / null_memory_resource / get_default_resource /
> set_default_resource
> - Aliases for all containers, using the polymorphic_allocator.
>
> As default resource, new_delete_resource and null_memory_resource are
> required to be globals, they are implemented in the separately compiled
> boost.container library that was used to implement the DLMalloc-based
> extended allocator.
>
> It seems that many users dislike building Boost libraries, but I felt this
> was the correct way to implement it. We could change or make it optionally
> header-only if there is demand. To avoid dependencies to some users, I made
> sure that memory_resource and resource_adaptor, which don't depend on the
> global default memory resource, can be used without linking the library.
>
> Some logic was refactored from scoped_allocator_adaptor to avoid repeating
> the complicated template and preprocessor machinery in the
> polymorphic_allocator. I hope this does not cause any problem to scoped
> allocator users.
>
> Any suggestion or bug report is welcome. Best,
>
> Ion
>

Very nice! :D

I should be able (as I was planning) to test this in a project but not
before one or two months unfortunately.
Also, you might want to notify people on the SG14 (low-latency/games)
discussion group which focus on this kind of features,
some of them might be able to test this earlier.

Joël Lamotte