[#BloombergLP-bdld-DatumMapRef-operator_subs]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::xref:BloombergLP/bdld/DatumMapRef.adoc[DatumMapRef]::operator[]
:relfileprefix: ../../../
:mrdocs:

Return a reference to the map entry at the specified `position`.

== Synopsis

Declared in `<bdld_datum.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdld/DatumMapRef/const_reference.adoc[DatumMapRef::const_reference]
operator[](xref:BloombergLP/bdld/DatumMapRef/size_type.adoc[size_type] position) const;
----

== Description

Return a reference providing non‐modifiable access to the element at the specified `position` in the array of map entries this reference object represents. The behavior is undefined unless `position < size()`.

== Return Value

a reference to the map entry at the specified `position`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *position*
| zero‐based index of the entry
|===


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