[#bsl-unordered_map-02b-at-06]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::at
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the mapped‐value associated with the specified `key`, if such an entry exists; otherwise throw `std::out_of_range` exception. Note that this method is not exception‐neutral.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE>::type
at(xref:bsl/unordered_map-02b/key_type.adoc[key_type] const& key);
----


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