:idprefix: changes_ :svn-ticket-url: https://svn.boost.org/trac/boost/ticket :github-pr-url: https://github.com/boostorg/unordered/pull :cpp: C++

`boost::hash_is_avalanching` in `<boost/container_hash/hash_is_avalanching.hpp>`. Use that header directly instead. `<boost/unordered/hash_traits.hpp>` will be removed in the future.

Added container `pmr` aliases when header `<memory_resource>` is available. The alias `boost::unordered::pmr::[container]` refers to `boost::unordered::[container]` with a `std::pmr::polymorphic_allocator` allocator type.

`boost::concurrent_flat_(map|set)` and vice versa.

Added fast containers `boost::unordered_flat_map` and `boost::unordered_flat_set`

based on open addressing.

Use `std::piecewise_construct` on recent versions of Visual {cpp},

which fixes emplacing string literals in old versions of Visual {cpp}.

Adjust SFINAE use to try to support g++ 3.4 ({svn-ticket-url}/7175[#7175^]).

On old versions of Visual {cpp}, use the container library's implementation

The behaviour of swap is different when the two containers to be

Fix a bug when inserting into an `unordered_map` or `unordered_set` using

iterators which returns `value_type` by copy.

The container object is now smaller thanks to using `boost::compressed_pair`

Disable incorrect Visual {cpp} warnings.

on Visual {cpp} 2009.

Some other minor internal changes to the implementation, tests and

documentation.

only g++ 4.4 in {cpp}0x mode).

Rename overload of `emplace` with hint, to `emplace_hint` as specified in