[#BloombergLP-balcl-Option-isTagValid]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balcl.adoc[balcl]::xref:BloombergLP/balcl/Option.adoc[Option]::isTagValid
:relfileprefix: ../../../
:mrdocs:

Return `true` if the tag is valid for this option, leaving the specified `stream` unaffected&semi; otherwise, write a diagnostic message to `stream` and return `false`&period;

== Synopsis

Declared in `&lt;balcl&lowbar;option&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isTagValid(std::ostream& stream) const;
----

== Return Value

`true` if the tag is valid, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *stream*
| diagnostic output stream
|===


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