[#bsl-unordered_set-09-begin-023]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-09.adoc[unordered_set<Attribute, AttributeHash>]::begin
:relfileprefix: ../../
:mrdocs:

Return an iterator providing 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.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-09/iterator.adoc[iterator]
begin() noexcept;
----


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