[#BloombergLP-bdlar-ArrayRef-manipulateElement]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlar.adoc[bdlar]::xref:BloombergLP/bdlar/ArrayRef.adoc[ArrayRef]::manipulateElement
:relfileprefix: ../../../
:mrdocs:

Invoke the specified `manipulator` on the array element at the specified `index`.

== Synopsis

Declared in `<bdlar_arrayref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_MANIPULATOR>
int
manipulateElement(
    t_MANIPULATOR& manipulator,
    int index) const;
----

== Description

The supplied `manipulator` must be a callable type that can be called as if it had the following signature: ` int manipulator(ELEMENT *refOrValue); ` Return the value from the invocation of `manipulator`. The behavior is undefined unless `0 <= index < size()`.

== Return Value

value from the invocation of `manipulator`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *manipulator*
| callable invoked on the element
| *index*
| zero‐based index of the element
|===


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