[#BloombergLP-bdlar-NullableValueRef-manipulateValue]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlar.adoc[bdlar]::xref:BloombergLP/bdlar/NullableValueRef.adoc[NullableValueRef]::manipulateValue
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:mrdocs:

Invoke the specified `manipulator` on the referred non‐null value. The supplied `manipulator` must be a callable type that can be called as if it had the following signature: ` int manipulator(VALUE *refOrValue); ` Return the value from the invocation of `manipulator`. The behavior is undefined if the referred object is null.

== Synopsis

Declared in `<bdlar_nullablevalueref.h>`

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


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