[#BloombergLP-bslstl-Optional_DerivedFromStdOptional]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional&lowbar;DerivedFromStdOptional
:relfileprefix: ../../
:mrdocs:

Component&hyphen;private concept that is satisfied when `t&lowbar;TYPE` derives from `std&colon;&colon;optional`&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;optional&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class t&lowbar;TYPE&gt;
concept Optional&lowbar;DerivedFromStdOptional = requires (const t&lowbar;TYPE&amp; t) &lcub; optional&lowbar;acceptsStdOptional(t)&semi; &rcub;;
----


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