[#bsl-unordered_multiset-06c-equal_range-0b]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::equal_range
:relfileprefix: ../../
:mrdocs:

Return a pair of iterators providing non‐modifiable access to the sequence of `value_type` objects in this unordered multiset equivalent to the specified `key`, where the first iterator is positioned at the start of the sequence, and the second is positioned one past the end of the sequence. If this unordered multiset contains no `value_type` objects equivalent to the `key`, then the two returned iterators will have the same value. 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/pair-0b.adoc[pair<const_iterator, const_iterator>]
equal_range(LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----


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