[#BloombergLP-bdlc-FlatHashSet-equal_range-00]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::equal_range
:relfileprefix: ../../../
:mrdocs:

Return the equal range for elements equivalent to `key`.

== Synopsis

Declared in `<bdlc_flathashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/pair-0b.adoc[bsl::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;
----

== Description

Return a pair of `const_iterator` providing non‐modifiable access to the sequence of `value_type` objects in this unordered set that are equivalent to the specified `key`, where the first iterator is positioned at the start of the sequence and the second iterator is positioned one past the end of the sequence. If this unordered set contains no `value_type` objects equivalent to `key`, then the two returned iterators will have the same value. Note that since an unordered set maintains unique keys, the range will contain at most one element.

== Return Value

pair of const iterators delimiting the equal range

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key whose equal range is returned
|===


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