[#BloombergLP-baljsn-EncodeImplUtil-validateChoice]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/baljsn.adoc[baljsn]::xref:BloombergLP/baljsn/EncodeImplUtil.adoc[EncodeImplUtil]::validateChoice
:relfileprefix: ../../../
:mrdocs:

Determine whether the choice `value` has a defined selection.

== Synopsis

Declared in `<baljsn_encodeimplutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
static
int
validateChoice(
    std::ostream* logStream,
    TYPE const& value);
----

== Description

Determine if the specified `value` satisfies the requirements for encoding using this component. If the `value` meets the encoding requirements, return 0, otherwise load an unspecified, human‐readable description of the requirements that are not satisfied by the `value` to the specified `logStream` and return a non‐zero value. The `value` is required to not have an undefined `selectionId`.

== Return Value

0 if valid, and a non‐zero value otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *logStream*
| stream for human‐readable error descriptions
| *value*
| choice value to validate
|===


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