[#bsl-unordered_multiset-06c-2constructor-0a9]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::unordered_multiset
:relfileprefix: ../../
:mrdocs:

Create an unordered multiset and insert each `value_type` object in the specified `values` initializer list. Optionally specify an `initialNumBuckets` indicating the initial size of the array of buckets of this container. If `initialNumBuckets` is not supplied, a single bucket is used. Optionally specify a `hashFunction` used to generate the hash values for the keys contained in this unordered multiset. If `hashFunction` is not supplied, a default‐constructed object of the (template parameter) type `HASH` is used. Optionally specify a key‐equality functor `keyEqual` used to verify that two keys are equivalent. If `keyEqual` is not supplied, a default‐constructed object of the (template parameter) type `EQUAL` is used. Optionally specify a `basicAllocator` used to supply memory. If `basicAllocator` is not supplied, a default‐constructed object of the (template parameter) type `ALLOCATOR` is used. If the type `ALLOCATOR` is `bsl::allocator` and `basicAllocator` is not supplied, the currently installed default allocator is used to supply memory. This method requires that the (template parameter) type `KEY` be `copy‐insertable` into this unordered multiset (see {Requirements on `KEY`}). Note that a `bslma::Allocator *` can be supplied for `basicAllocator` if the type `ALLOCATOR` is `bsl::allocator` (the default).

== Synopsis

Declared in `<bslstl_unorderedmultiset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class = void>
requires bsl::IsStdAllocator<ALLOCATOR>::value
unordered_multiset(
    std::initializer_list<KEY> values,
    ALLOCATOR const& basicAllocator);
----


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