[#beman-optional-optional-03-and_then-0c]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-03.adoc[optional]::and_then
:relfileprefix: ../../../
:mrdocs:

Applies a function to the contained 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 `std::invoke_result_t<F, T&>`, but wrapped in an optional. The function `f` must return an optional type.

== Return Value

auto

== Template Parameters

[cols="1,4"]
|===
|Name|Description

| *F*
| The type of the invocable
|===

== Parameters

[cols="1,4"]
|===
|Name|Description

| *f*
| The invocable to apply to the contained value
|===


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