saved 2025-01-04-Joaquins2024Q4Update.md draft

Author: joaquintides

_posts/2025-01-04-Joaquins2024Q4Update.md

@@ -9,27 +9,26 @@ author-name: Joaquín M López Muñoz
 
 During Q4 2024, I've been working in the following areas:
 
-### Boost.Mp11
+### Boost.Unordered
 
-* Implemented [`mp_lambda`](https://www.boost.org/libs/mp11/doc/html/mp11.html#lambda)
-(released in Boost 1.87.0), a metaprogramming utility inspired by the venerable
-[_placeholder expressions_ from Boost.MPL](https://live.boost.org/libs/mpl/doc/refmanual/placeholder-expression.html).
-`mp_lambda` allows us to generate complex types specified with a rather natural syntax
-in terms of elementary input types indicated by
-[Boost.Mp11 _placeholder types_](https://www.boost.org/libs/mp11/doc/html/mp11.html#1_9).
-For instance, `std::pair<_1*, _2*>` can be regarded as a type template with
-two placeholder positions, and `mp_lambda<std::pair<_1*, _2*>>::fn<int, char>` is,
-unsurprisingly enough, the type `std::pair<int*, char*>`. My original motivation
-for writing this utility is to provide a Boost.Mp11 equivalent to Boost.MPL lambda
-expressions that can pave the way for an eventual modernization of
-Boost.Flyweight, which [relies heavily](https://www.boost.org/libs/flyweight/doc/tutorial/configuration.html#factory_types)
-on this functionality from Boost.MPL.
-* Rewritten the implementation of `mp_is_set`
-([PR#100](https://github.com/boostorg/mp11/pull/100), released in Boost 1.87.0) to
-achieve some rather noticeable compile-time improvements.
+* Updated CI support ([PR#293](https://github.com/boostorg/unordered/pull/293),
+[PR#296](https://github.com/boostorg/unordered/pull/296),
+[PR#297](https://github.com/boostorg/unordered/pull/297),
+[PR#298](https://github.com/boostorg/unordered/pull/298)).
+* Prepared a private document for Peter Dimov and Braden Gantsky discussing
+massively parallel scenarios where [ParlayHash](https://github.com/cmuparlay/parlayhash)
+has better performance than `boost::concurrent_flat_map`. We haven't been able
+to progress much further than that in Q4 2024, mainly because of my lack
+of availablity for this specific task.
+* After the last [major update in Boost 1.87.0](https://www.boost.org/libs/unordered/doc/html/unordered.html#changes_release_1_87_0_major_update),
+the backlog for Boost.Unordered is basically cleared. This means that the library
+will likely enter into maintenance mode, except if new requests show up
+—do you have any?
 
 ### Boost.PolyCollection
 
+* Updated CI support ([PR#22](https://github.com/boostorg/poly_collection/pull/22),
+[PR#23](https://github.com/boostorg/poly_collection/pull/23)).
 * Added the new [`boost::variant_collection`](https://www.boost.org/doc/libs/develop/doc/html/poly_collection/reference.html#poly_collection.reference.header_boost_poly_collection_va0)
 container (to be released in Boost 1.88.0).
 `boost::variant_collection_of<Ts...>` is similar to
@@ -48,3 +47,23 @@ will print first the `int`s in the collection, then the `double`s, and finally
 the `std::string`s. In exchange for this restriction, important
 [processing speedups](https://www.boost.org/doc/libs/develop/doc/html/poly_collection/performance.html#poly_collection.performance.processing_tests.results_for_boost_variant_collec)
 can be obtained.
+
+### Boost.Mp11
+
+* Implemented [`mp_lambda`](https://www.boost.org/libs/mp11/doc/html/mp11.html#lambda)
+(released in Boost 1.87.0), a metaprogramming utility inspired by the venerable
+[_placeholder expressions_ from Boost.MPL](https://live.boost.org/libs/mpl/doc/refmanual/placeholder-expression.html).
+`mp_lambda` allows us to generate complex types specified with a rather natural syntax
+in terms of elementary input types indicated by
+[Boost.Mp11 _placeholder types_](https://www.boost.org/libs/mp11/doc/html/mp11.html#1_9).
+For instance, `std::pair<_1*, _2*>` can be regarded as a type template with
+two placeholder positions, and `mp_lambda<std::pair<_1*, _2*>>::fn<int, char>` is,
+unsurprisingly enough, the type `std::pair<int*, char*>`. My original motivation
+for writing this utility is to provide a Boost.Mp11 equivalent to Boost.MPL lambda
+expressions that can pave the way for an eventual modernization of
+Boost.Flyweight, which [relies heavily](https://www.boost.org/libs/flyweight/doc/tutorial/configuration.html#factory_types)
+on this functionality from Boost.MPL.
+* Rewritten the implementation of `mp_is_set`
+([PR#100](https://github.com/boostorg/mp11/pull/100), released in Boost 1.87.0) to
+achieve some rather noticeable compile-time improvements.
+