[#bsl-map-0c7-at-062]
= xref:bsl.adoc[bsl]::xref:bsl/map-0c7.adoc[map&lt;int, pair&lt;shared&lowbar;ptr&lt;Statistics&gt;, shared&lowbar;ptr&lt;Collector&lt;OsLinux&gt;&gt;&gt;&gt;]::at
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the mapped&hyphen;value associated with a key that is equivalent to the specified `key`, if such an entry exists&semi; otherwise, throw a `std&colon;&colon;out&lowbar;of&lowbar;range` exception&period; Note that this method may also throw a different kind of exception if the (user&hyphen;supplied) comparator throws&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;map&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class LOOKUP&lowbar;KEY&gt;
xref:bsl/add_lvalue_reference-01/type.adoc[add&lowbar;lvalue&lowbar;reference&lt;pair&lt;shared&lowbar;ptr&lt;Statistics&gt;, shared&lowbar;ptr&lt;Collector&lt;OsLinux&gt;&gt;&gt;&gt;::type]
at(LOOKUP&lowbar;KEY const& key)
requires BloombergLP&colon;&colon;bslmf&colon;&colon;IsTransparentPredicate&lt;COMPARATOR,
                                                   LOOKUP&lowbar;KEY&gt;&colon;&colon;value;
----


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