[#bsl-map-0a7-at-09]
= xref:bsl.adoc[bsl]::xref:bsl/map-0a7.adoc[map]::at
:relfileprefix: ../../
:mrdocs:

Return a reference providing non‐modifiable access to the mapped‐value associated with a key that is equivalent to the specified `key`, if such an entry exists; otherwise, throw a `std::out_of_range` exception. Note that this method may also throw a different kind of exception if the (user‐supplied) comparator throws.

== Synopsis

Declared in `<bslstl_map.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE const>::type
at(xref:bsl/map-0a7/key_type.adoc[key_type] const& key) const;
----


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