[#BloombergLP-bdlb-NullableValue_DerivedFromOptional]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::NullableValue_DerivedFromOptional
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:mrdocs:

This component‐private concept models whether a type is derived from one of `std::optional`, or `bsl::optional`. Note that this concept is always satisfied for `bdlb::NullableValue` as it is derived from `bsl::optional`.

== Synopsis

Declared in `<bdlb_nullablevalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
concept NullableValue_DerivedFromOptional = NullableValue_DerivedFromBslOptional<t_TYPE>   ||
    NullableValue_DerivedFromStdOptional<t_TYPE>;
----


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