[#BloombergLP-baljsn-EncoderOptions-manipulateAttribute-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/baljsn.adoc[baljsn]::xref:BloombergLP/baljsn/EncoderOptions.adoc[EncoderOptions]::manipulateAttribute
:relfileprefix: ../../../
:mrdocs:

Invoke `manipulator` on the modifiable attribute indicated by `id`.

== Synopsis

Declared in `<baljsn_encoderoptions.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class MANIPULATOR>
int
manipulateAttribute(
    MANIPULATOR& manipulator,
    int id);
----

== Description

Invoke the specified `manipulator` on the address of the (modifiable) attribute indicated by the specified `id`, supplying `manipulator` with the corresponding attribute information structure. Return the value returned from the invocation of `manipulator` if `id` identifies an attribute of this class, and ‐1 otherwise.

== Return Value

value returned by `manipulator`, or ‐1 if `id` is not found

== Parameters

[cols="1,4"]
|===
| Name| Description
| *manipulator*
| functor invoked on the matching attribute
| *id*
| attribute id
|===


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