[#bsl-unordered_multiset-06c-equal_range-06]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered&lowbar;multiset]::equal&lowbar;range
:relfileprefix: ../../
:mrdocs:

Return an iterator pair covering elements equivalent to `key`&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;unorderedmultiset&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class LOOKUP&lowbar;KEY&gt;
xref:bsl/pair-0b.adoc[pair&lt;iterator, iterator&gt;]
equal&lowbar;range(LOOKUP&lowbar;KEY const& key)
requires BloombergLP&colon;&colon;bslmf&colon;&colon;IsTransparentPredicate&lt;HASH, LOOKUP&lowbar;KEY&gt;&colon;&colon;value
        &amp;&amp; BloombergLP&colon;&colon;bslmf&colon;&colon;IsTransparentPredicate&lt;EQUAL,LOOKUP&lowbar;KEY&gt;&colon;&colon;value;
----

== Description

Return a pair of iterators providing modifiable access to the sequence of `value&lowbar;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&period; If this unordered multiset contains no `value&lowbar;type` objects equivalent to the `key`, then the two returned iterators will have the same value&period; The behavior is undefined unless `key` is equivalent to the elements of at most one equivalent&hyphen;key group in this unordered multiset&period;

== Return Value

pair of iterators delimiting the equal&hyphen;key range

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key value to look up
|===


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