[#bsl-optional-0d]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional<t_TYPE>]
:relfileprefix: ../
:mrdocs:

Deduce the specified type `t_TYPE` from the corresponding type supplied to the constructor of `optional`.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
xref:bsl/optional-072.adoc[optional<t_TYPE>](t_TYPE) -> xref:bsl/optional-072.adoc[optional<t_TYPE>];
----


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