[#bsl-unordered_map-02b-bucket_size]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::bucket_size
:relfileprefix: ../../
:mrdocs:

Return the number of elements contained in the bucket at the specified `index` in the array of buckets maintained by this unordered map. The behavior is undefined unless `index < bucket_count()`.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_map-02b/size_type.adoc[size_type]
bucket_size(xref:bsl/unordered_map-02b/size_type.adoc[size_type] index) const;
----


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