[#bsl-unordered_multiset-06c-count-007]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::count
:relfileprefix: ../../
:mrdocs:

Return the number of `value_type` objects within this unordered multiset that are equivalent to the specified `key`. The behavior is undefined unless `key` is equivalent to the elements of at most one equivalent‐key group in this unordered multiset.

== Synopsis

Declared in `<bslstl_unorderedmultiset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/unordered_multiset-06c/size_type.adoc[size_type]
count(LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----


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