[#bsl-unordered_map-02b-operator_subs-01]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::operator[]
:relfileprefix: ../../
:mrdocs:

Subscript operators

== Synopses

Declared in `<bslstl_unorderedmap.h>`

Return a modifiable reference to the mapped value for movable `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE>::type
xref:bsl/unordered_map-02b/operator_subs-0d4.adoc[operator[]](xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<key_type>] key);
----

[.small]#xref:bsl/unordered_map-02b/operator_subs-0d4.adoc[_» more..._]#

Return a modifiable reference to the mapped value for `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE>::type
xref:bsl/unordered_map-02b/operator_subs-0de.adoc[operator[]](xref:bsl/unordered_map-02b/key_type.adoc[key_type] const& key);
----

[.small]#xref:bsl/unordered_map-02b/operator_subs-0de.adoc[_» more..._]#

Return a modifiable reference to the mapped value for an equivalent `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
add_lvalue_reference<VALUE>::type
xref:bsl/unordered_map-02b/operator_subs-0a.adoc[operator[]](LOOKUP_KEY&& key)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:bsl/unordered_map-02b/operator_subs-0a.adoc[_» more..._]#

== Return Value

modifiable reference to the mapped value

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key to look up
|===


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