[#beman-optional-optional-03-2constructor-04a]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-03.adoc[optional]::optional
:relfileprefix: ../../../
:mrdocs:

Constructs the value from `rhs` if it has one.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class U>
constexpr
explicit(!std::is_convertible_v<U, T>)
optional(xref:beman/optional/optional-03.adoc[optional<U>] const& rhs)
requires (detail::enable_from_other<T, U, const U&>);
----

== Description

Converting copy constructor.

== Parameters

[cols=2]
|===
| Name
| Description
| *rhs*
| The object to copy construct from
|===


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