Exit Zen
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image::benchmarks-set/gcc/running insertion.xlsx.practice norehash non-unique.png[width=250,link=_images/benchmarks-set/gcc/running insertion.xlsx.practice norehash non-unique.png,window=_blank]
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addressing, users will be surprised if the performance doesn't reflect that.
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Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
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`size_type max_bucket_count() const`
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_Allocator_
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_Pred_
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A more detailed description of Boost.Unordered's closed-addressing implementation is given in an https://bannalia.blogspot.com/2022/06/advancing-state-of-art-for.html[external article]. For more information on implementation rationale, read the xref:rationale.adoc#rationale_closed_addressing_containers[corresponding section].
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xref:reference/unordered_flat_map.adoc[Class Template +++<code style="color: inherit;">+++unordered_flat_map+++</code>+++]
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_Pred_
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A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
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_Pred_
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_Pred_
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A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
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Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
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A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
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_Allocator_
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These statistics can be used to determine if a given hash function can be marked as link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[__avalanching__].
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xref:reference/unordered_multimap.adoc[`unordered_multimap`]
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Custom Types
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Storing an object in an unordered associative container requires both a key equality function and a hash function. The default function objects in the standard containers support a few basic types including integer types, floating point types, pointer types, and the standard strings. Since Boost.Unordered uses link:../../../../container_hash/index.html[boost::hash^] it also supports some other types, including standard containers. To use any types not supported by these methods you have to extend Boost.Hash to support the type or use your own custom equality predicates and hash functions. See the xref:hash_equality.adoc#hash_equality[Equality Predicates and Hash Functions], section for more details.
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