[#BloombergLP-bdlb-NullableValue_DerivedFromStdOptional]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::NullableValue&lowbar;DerivedFromStdOptional
:relfileprefix: ../../
:mrdocs:

This component&hyphen;private concept is used in the subsequent implementation of the component&hyphen;private concept `NullableValue&lowbar;DerivedFromOptional`&period;

== Synopsis

Declared in `&lt;bdlb&lowbar;nullablevalue&period;h&gt;`

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


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