[#util-Unexpected]
= xref:util.adoc[util]::Unexpected
:relfileprefix: ../
:mrdocs:

The util::Unexpected class represents an unexpected value stored in util::Expected.

== Synopsis

Declared in `<util/expected.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class E>
class Unexpected;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:util/Unexpected/2constructor.adoc[`Unexpected`]         [.small]#[constructor]#
| Construct from an error value.
| xref:util/Unexpected/error-0b.adoc[`error`] 
| Access the stored error value.
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:EstimationError.adoc[`::EstimationError`]
| Build a fee rate estimation error result: a zero‐value estimation identifying the estimator and target, alongside the error message.
|===


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