Re: [hub] Porting and pre-review experiments

El 21/04/2026 a las 18:25, Joaquin M López Muñoz via Boost escribió:
> At this microlevel, it's hard to beat a local mask-based loop as 
> boost::container::hub uses.

Very hard. I was crazy trying to know why nest was behind in the 
for_each bench without luck. It turns that doing:

pbb->mask & (full << 1 << std::size_t(n));

vs (note no std::size_t conversion on n, which is an int)

pbb->mask & (full << 1 << n);

was a 5% improvement because converting int to uint64 before shifting 
was a noticeable impact, I was quite shocked.

I think the porting performance is on par with the proposal in my 
machine, in case you want to test it:

https://github.com/boostorg/container/blob/develop/experimental/bench_hub.cpp

Ion
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