[#bsl-unordered_map-0bf-operator_subs-05]
= 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 a key that is equivalent with the specified `key`; if this `map` does not already contain a `value_type` object having an equivalent key, first insert a new `value_type` object having the move‐inserted `key` and a default‐constructed `VALUE` object, and return a reference to the newly mapped (default) value. This method requires that the (template parameter) type `KEY` be `move‐insertable` into this map and the (template parameter) type `VALUE` be `default‐insertable` into this map (see {Requirements on `KEY` and `VALUE`}).

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/add_lvalue_reference-040/type.adoc[add_lvalue_reference<Json>::type]
operator[](LOOKUP_KEY&& key)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

== Description

Note: implemented inline due to Sun CC compilation error.


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