[#bsl-unordered_map-0bf-operator_subs-02]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::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) type `KEY` is `copy‐constructible` and the (template parameter) `VALUE` is "default‐constructible" (see {Requirements on `value_type`}).

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/add_lvalue_reference-040/type.adoc[add_lvalue_reference<Json>::type]
operator[](xref:bsl/unordered_map-0bf/key_type.adoc[key_type] const& key);
----


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