[#beman-optional-optional-03-or_else-05]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-03.adoc[optional]::or_else
:relfileprefix: ../../../
:mrdocs:

Returns an optional containing the stored value if it has one, or the result of applying `f` to the optional if it does not.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class F>
constexpr
xref:beman/optional/optional-03.adoc[optional<T>]
or_else(F&& f) const &;
----

== Return Value

* optional
* optional<T>


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