[#bsl-map-0c7-at-062]
= xref:bsl.adoc[bsl]::xref:bsl/map-0c7.adoc[map<int, pair<shared_ptr<Statistics>, shared_ptr<Collector<OsLinux>>>>]::at
:relfileprefix: ../../
:mrdocs:

Return a reference providing 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"]
----
template<class LOOKUP_KEY>
xref:bsl/add_lvalue_reference-01/type.adoc[add_lvalue_reference<pair<shared_ptr<Statistics>, shared_ptr<Collector<OsLinux>>>>::type]
at(LOOKUP_KEY const& key)
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;
----


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