added Joaquín's 2025Q3 update

Author: joaquintides

_posts/2025-10-09-Joaquins2025Q3Update.md

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+---
+layout: post
+nav-class: dark
+categories: joaquin
+title: Working on Boost.Bloom roadmap
+author-id: joaquin
+author-name: Joaquín M López Muñoz
+---
+
+During Q3 2025, I've been working in the following areas:
+
+### Boost.Bloom
+
+[Boost.Bloom](https://www.boost.org/doc/libs/latest/libs/bloom/doc/html/bloom.html) has been officially
+released in Boost 1.89. I've continued working on a number of roadmap features:
+
+* Originally, some subfilters (`block`, `fast_multiblock32` and `fast_multiblock64)`
+implemented lookup in a branchful or early-exit way: as soon as a bit checks to zero, lookup
+terminates (with result `false`). After extensive benchmarks, I've changed these subfilters
+to branchless execution for somewhat better performance ([PR#42](https://github.com/boostorg/bloom/pull/42)).
+Note that `boost::bloom::filter<T, K, ...>` is still
+branchful for `K` (the number of subfilter operations per element): in this case, branchless
+execution involves too much extra work and does not compensate for the removed branch speculation.
+Ivan Matek helped with this investigation.
+* Added [bulk-mode operations](https://www.boost.org/doc/libs/develop/libs/bloom/doc/html/bloom.html#tutorial_bulk_operations)
+following a similar approach to what we did with Boost.Unordered concurrent containers
+([PR#42](https://github.com/boostorg/bloom/pull/43)).
+* I've been also working on a proof of concept for a dynamic filter where the _k_ and/or _k'_ values
+can be specified at run time. As expected, the dynamic filter is slower than its static
+counterpart, but benchmarks show that execution times can increase by up to 2x for lookup and
+even more for insertion, which makes me undecided as to whether to launch this feature.
+An alternative approach is to have a `dynamic_filter<T>` be a wrapper over a virtual interface
+whose implementation is selected at run time from a static table of implementations
+based on static `filter<T, K>` with
+`K` between 1 and some maximum value (this type erasure technique is described, among
+other places, in slides 157-205 of Sean Parent's
+[C++ Seasoning](https://raw.githubusercontent.com/wiki/sean-parent/sean-parent.github.io/presentations/2013-09-11-cpp-seasoning/cpp-seasoning.pdf)
+talk): performance is much better, but this approach also has drawbacks of its own.
+* Reviewed a contribution fom Braden Ganetsky to make the project's `CMakeLists.txt`
+more Visual Studio-friendly ([PR#33](https://github.com/boostorg/bloom/pull/33)).
+
+### Boost.Unordered
+
+* Reviewed [PR#316](https://github.com/boostorg/unordered/pull/316).
+
+### Boost.MultiIndex
+
+* Reviewed [PR#83](https://github.com/boostorg/multi_index/pull/83), [PR#84](https://github.com/boostorg/multi_index/pull/84).
+
+### Boost.Flyweight
+
+* Fixed an internal compile error that manifested with newer compilers implementing
+[P0522R0](https://wg21.link/p0522r0)
+([PR#23](https://github.com/boostorg/flyweight/pull/23)).
+* Reviewed [PR#22](https://github.com/boostorg/flyweight/pull/22).
+
+### Boost.PolyCollection
+
+* Reviewed [PR#32](https://github.com/boostorg/poly_collection/pull/32).
+
+### Boost website
+
+* Filed issues
+[#1845](https://github.com/boostorg/website-v2/issues/1845),
+[#1846](https://github.com/boostorg/website-v2/issues/1846),
+[#1851](https://github.com/boostorg/website-v2/issues/1851),
+[#1858](https://github.com/boostorg/website-v2/issues/1858),
+[#1900](https://github.com/boostorg/website-v2/issues/1900),
+[#1927](https://github.com/boostorg/website-v2/issues/1927),
+[#1936](https://github.com/boostorg/website-v2/issues/1936),
+[#1937](https://github.com/boostorg/website-v2/issues/1937).
+* Helped with the transition of the global release notes procedure to one
+based on the new website repo exclusively
+([PR#508](https://github.com/boostorg/website-v2-docs/pull/508),
+[PR#510](https://github.com/boostorg/website-v2-docs/pull/510)). This procedure is
+expected to launch in time for the upcoming Boost 1.90 release.
+
+### Boost promotion
+
+* Prepared and posted around 10 messages on Boost's X account and Reddit.
+The activity on social media has grown considerably thanks to the dedication of
+Rob Beeston and others.
+
+### Support to the community
+
+* Helped Jean-Louis Leroy get Drone support for the upcoming
+Boost.OpenMethod library ([PR#39](https://github.com/boostorg/openmethod/pull/39)).
+* Supporting the community as a member of the Fiscal Sponsorhip Committee (FSC).