[#beman-optional-optional-06-and_then]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-06.adoc[optional<T&>]::and_then
:relfileprefix: ../../../
:mrdocs:

Applies a function to the stored value if there is one.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class F>
constexpr
auto
and_then(F&& f) const;
----

== Description

The return type is the same as

[,cpp]
----
{std::invoke_result_t<F, T&>},
 but wrapped in an optional. The function \p f must return an optional type.



----
== Return Value

auto


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