[#bsl-unordered_multimap-0b0-2constructor-021]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap]::unordered_multimap
:relfileprefix: ../../
:mrdocs:

Create an unordered multimap and insert each `value_type` object in the specified `values` initializer list. Optionally specify an `initialNumBuckets` indicating the minimum initial size of the array of buckets of this container. If `initialNumBuckets` is not supplied, a single empty bucket is used if `values` is empty, and an unspecified number of buckets is used otherwise. Optionally specify a `hashFunction` used to generate the hash values for the keys contained in this unordered multimap. If `hashFunction` is not supplied, a default‐constructed object of the (template parameter) type `HASH` is used. Optionally specify a key‐equivalence 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) types `KEY` and `VALUE` both be `copy‐insertable` into this unordered multimap (see {Requirements on `KEY` and `VALUE`}). Note that a `bslma::Allocator *` can be supplied for `basicAllocator` if the type `ALLOCATOR` is `bsl::allocator` (the default).

== Synopsis

Declared in `<bslstl_unorderedmultimap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class = void,
    class = void,
    class = void>
requires std::is_invocable_v<HASH, const KEY &> && std::is_invocable_v<EQUAL, const KEY &, const KEY &> && bsl::IsStdAllocator_v<ALLOCATOR>
unordered_multimap(
    std::initializer_list<value_type> values,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----


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