Boost logo

Boost :

Subject: Re: [boost] [spinlock] concurrent_unordered_map is ready for review
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2014-09-02 05:43:01

On 1 Sep 2014 at 15:41, Edward Diener wrote:

> >> Do you intend this to be a separate library, or would it go into something
> >> like Boost.Container?
> >
> > Not sure yet. My next goal is no-alloc promise-future, also based on
> > spinlocks.
> >
> > I don't intend to "finish" concurrent_unordered_map past what is
> > already done, and I suspect no Boost library will accept it until I
> > or someone else does.
> What do you mean by the last part of your sentence ?

I'm not sure what is unclear in the sentence.
concurrent_unordered_map is missing things like all const overloads
and iterators (they are aliased to non-const, so code compiles), or
C++03 support, or local iterators or container copy and move support.
Noexcept is always on too instead of being conditional.

But I have no personal need for all that, and I need to get on with
other things, so I leave it where it is at - it is still extremely
useful, the code is of a very high quality and is extremely well unit
tested, it scales linearly to CPU cores and it solves the problem of
concurrent unordered maps without breaking STL compatibility or
semantics, so concurrent erase finally works, unlike most other

I hope a GSoC student finishes it in 2015 or 2016, but for me it's
enough for me to move on, so I am. You will hear what I will be doing
next later today in fact.


ned Productions Limited Consulting

Boost list run by bdawes at, gregod at, cpdaniel at, john at