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

`begin` overloads

== Synopses

Declared in `<bslstl_unorderedset.h>`

Return an iterator to the first element of this set.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-0d2d/iterator.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::iterator]
xref:bsl/unordered_set-0d2d/begin-07.adoc[begin]() noexcept;
----

[.small]#xref:bsl/unordered_set-0d2d/begin-07.adoc[_» more..._]#

Return an iterator to the first element of this set.


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

[.small]#xref:bsl/unordered_set-0d2d/begin-0b.adoc[_» more..._]#

Return a local iterator to the first element in the bucket at `index`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-0d2d/local_iterator.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::local_iterator]
xref:bsl/unordered_set-0d2d/begin-09.adoc[begin](xref:bsl/unordered_set-0d2d/size_type.adoc[size_type] index);
----

[.small]#xref:bsl/unordered_set-0d2d/begin-09.adoc[_» more..._]#

Return a local iterator to the first element in the bucket at `index`.


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

[.small]#xref:bsl/unordered_set-0d2d/begin-0e.adoc[_» more..._]#

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *index*
| bucket index
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#