[#BN_GENCB_get_arg]
= BN_GENCB_get_arg
:mrdocs:

Return the user argument previously associated with a BN_GENCB.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
BN_GENCB_get_arg(xref:BN_GENCB.adoc[BN_GENCB]* cb);
----

== Return Value

The `cb_arg` pointer stored in `cb.`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cb*
| Callback object set via BN_GENCB_set() or BN_GENCB_set_old().
|===


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