[#bsl-optional-072-or_else-09]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::or_else
:relfileprefix: ../../
:mrdocs:

Return this optional if engaged; otherwise invoke `func`.

== Synopses

Declared in `<bslstl_optional.h>`

Return this optional if engaged; otherwise invoke `func`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_FUNC>
constexpr
xref:bsl/optional-072.adoc[optional<t_TYPE>]
xref:bsl/optional-072/or_else-0b.adoc[or_else](t_FUNC&& func) const &
requires conjunction_v<std::is_invocable<t_FUNC>,
                              std::is_copy_constructible<t_TYPE>>;
----

[.small]#xref:bsl/optional-072/or_else-0b.adoc[_» more..._]#

Return this optional if engaged; otherwise invoke `func`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_FUNC>
constexpr
xref:bsl/optional-072.adoc[optional<t_TYPE>]
xref:bsl/optional-072/or_else-03.adoc[or_else](t_FUNC&& func) &&
requires conjunction_v<std::is_invocable<t_FUNC>,
                              std::is_move_constructible<t_TYPE>>;
----

[.small]#xref:bsl/optional-072/or_else-03.adoc[_» more..._]#

== Return Value

this optional if engaged, otherwise the result of `func`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *func*
| callable invoked with the contained value or when empty
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#