[#beman-optional-optional-06-2constructor-0f8]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-06.adoc[optional<T&>]::optional
:relfileprefix: ../../../
:mrdocs:

In‐place constructor.

== Synopsis

Declared in `<beman/optional/optional.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class Arg>
requires (std::is_constructible_v<T&, Arg> && !detail::reference_constructs_from_temporary_v<T&, Arg>)
constexpr
explicit
optional(
    xref:beman/optional/in_place_t.adoc[in_place_t],
    Arg&& arg);
----

== Template Parameters

[cols=2]
|===
| Name
| Description
| *Arg*
| 
|===

== Parameters

[cols=2]
|===
| Name
| Description
| *arg*
| 
|===


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