[#bsl-map-0a7-operator_subs-0e4]
= xref:bsl.adoc[bsl]::xref:bsl/map-0a7.adoc[map]::operator[]
:relfileprefix: ../../
:mrdocs:

Subscript operators

== Synopses

Declared in `<bslstl_map.h>`

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<VALUE>::type
xref:bsl/map-0a7/operator_subs-0e5.adoc[operator[]](xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<key_type>] key);
----

[.small]#xref:bsl/map-0a7/operator_subs-0e5.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/map-0a7/operator_subs-0d.adoc[operator[]](xref:bsl/map-0a7/key_type.adoc[key_type] const& key);
----

[.small]#xref:bsl/map-0a7/operator_subs-0d.adoc[_» more..._]#

Return mapped‐value access for an equivalent lookup key.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
add_lvalue_reference<VALUE>::type
xref:bsl/map-0a7/operator_subs-08.adoc[operator[]](LOOKUP_KEY&& key)
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;
----

[.small]#xref:bsl/map-0a7/operator_subs-08.adoc[_» more..._]#

== Return Value

modifiable reference to the mapped value

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key whose mapped value is accessed or inserted
|===


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