[#BloombergLP-bslstl-Optional_DerivedFromOptional]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional_DerivedFromOptional
:relfileprefix: ../../
:mrdocs:

This component‐private concept models whether a type is derived from one of `std::optional` or `bsl::optional`.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
concept Optional_DerivedFromOptional = Optional_DerivedFromBslOptional<t_TYPE> ||
    Optional_DerivedFromStdOptional<t_TYPE>;
----


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