[#btck_NotificationInterfaceCallbacks-user_data]
= xref:btck_NotificationInterfaceCallbacks.adoc[btck_NotificationInterfaceCallbacks]::user_data
:relfileprefix: ../
:mrdocs:

Holds a user‐defined opaque structure that is passed to the notification callbacks. If user_data_destroy is also defined ownership of the user_data is passed to the created context options and subsequently context.

== Synopsis

Declared in `<kernel/bitcoinkernel.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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void* user_data;
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