[#bsl-unordered_set-0d2d-begin-0b]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-0d2d.adoc[unordered_set]::begin
:relfileprefix: ../../
:mrdocs:

Return an iterator to the first element of this set.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-0d2d/const_iterator.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::const_iterator]
begin() const noexcept;
----

== Description

Return an iterator providing non‐modifiable access to the first `value_type` object in the sequence of `value_type` objects maintained by this set, or the `end` iterator if this set is empty.

== Return Value

const iterator to the first element, or `end()` if empty


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