[#nlohmann-ordered_map-operator_subs-0e]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/ordered_map.adoc[ordered_map]::operator[]
:relfileprefix: ../../
:mrdocs:

Subscript operators

== Synopses

Declared in `<nlohmann/ordered_map.hpp>`

accesses the element with the given key, inserting a default‐constructed value if it does not exist


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
T&
xref:nlohmann/ordered_map/operator_subs-0a.adoc[operator[]](xref:nlohmann/ordered_map/key_type.adoc[key_type] const& key);
----

[.small]#xref:nlohmann/ordered_map/operator_subs-0a.adoc[_» more..._]#

accesses the element with the given key


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
T const&
xref:nlohmann/ordered_map/operator_subs-04.adoc[operator[]](xref:nlohmann/ordered_map/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:nlohmann/ordered_map/operator_subs-04.adoc[_» more..._]#

accesses the element with the given key, inserting a default‐constructed value if it does not exist


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class KeyType>
requires detail::is_usable_as_key_type<key_compare, key_type, KeyType>::value
T&
xref:nlohmann/ordered_map/operator_subs-06.adoc[operator[]](KeyType&& key);
----

[.small]#xref:nlohmann/ordered_map/operator_subs-06.adoc[_» more..._]#

accesses the element with the given key


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class KeyType>
requires detail::is_usable_as_key_type<key_compare, key_type, KeyType>::value
T const&
xref:nlohmann/ordered_map/operator_subs-02.adoc[operator[]](KeyType&& key) const;
----

[.small]#xref:nlohmann/ordered_map/operator_subs-02.adoc[_» more..._]#

== Exceptions

[cols="1,4"]
|===
| Name| Thrown on
| `std::out_of_range`
| if the container does not have an element with the given key
|===

== Return Value

* reference to the value associated with _key_
* const reference to the value associated with _key_

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key* [in]
| key of the element to access
|===


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