[#bsl-optional-072-and_then-06]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::and_then
:relfileprefix: ../../
:mrdocs:

If this object contains a value, invoke the specified `func` with the contained value as an argument and return the result of that invocation; otherwise, return an empty optional. Note that `func` must return a specialization of `bsl::optional`. Also note that the return type of `func` does not have to be this object type. Also note that the optional object returned by `func` is returned as‐is, without copying or moving. Finally note that the default allocator is used for constructing the empty optional when `func` is not invoked.

== Synopsis

Declared in `<bslstl_optional.h>`

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


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