[#btck-KernelNotifications]
= xref:btck.adoc[btck]::KernelNotifications
:relfileprefix: ../
:mrdocs:

Base class for receiving kernel notifications; override the handlers you need.

== Synopsis

Declared in `<kernel/bitcoinkernel_wrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class KernelNotifications;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:btck/KernelNotifications/2destructor.adoc[`~KernelNotifications`] [.small]#[destructor]# [.small]#[virtual]#
| Destroys the notification handler.
| xref:btck/KernelNotifications/BlockTipHandler.adoc[`BlockTipHandler`]  [.small]#[virtual]#
| Called when the active chain tip advances.
| xref:btck/KernelNotifications/FatalErrorHandler.adoc[`FatalErrorHandler`]  [.small]#[virtual]#
| Called on a fatal, unrecoverable error.
| xref:btck/KernelNotifications/FlushErrorHandler.adoc[`FlushErrorHandler`]  [.small]#[virtual]#
| Called on a recoverable flush error.
| xref:btck/KernelNotifications/HeaderTipHandler.adoc[`HeaderTipHandler`]  [.small]#[virtual]#
| Called when the best header advances.
| xref:btck/KernelNotifications/ProgressHandler.adoc[`ProgressHandler`]  [.small]#[virtual]#
| Called to report progress of a long‐running operation.
| xref:btck/KernelNotifications/WarningSetHandler.adoc[`WarningSetHandler`]  [.small]#[virtual]#
| Called when a warning becomes active.
| xref:btck/KernelNotifications/WarningUnsetHandler.adoc[`WarningUnsetHandler`]  [.small]#[virtual]#
| Called when a previously active warning clears.
|===



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