[#v3_ext_method-usr_data]
= xref:v3_ext_method.adoc[v3&lowbar;ext&lowbar;method]::usr&lowbar;data
:relfileprefix: ../
:mrdocs:

Extension&hyphen;specific data pointer for method callbacks&period;

== Synopsis

Declared in `&lt;openssl&sol;x509v3&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void* usr&lowbar;data;
----


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