[#bsl-unordered_map-02b-operator_subs-0d4]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the mapped‐value associated with the specified `key` in this unordered map; if this unordered map does not already contain a `value_type` object with `key`, first insert a new `value_type` object having `key` and a default‐constructed `VALUE` object. Note that this method requires that the (template parameter) `VALUE` is "default‐constructible" (see {Requirements on `value_type`}). Note that `key` may be modified; it is guaranteed to be left in a valid state.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE>::type
operator[](xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<key_type>] key);
----


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