[#CRYPTO_new_ex_data]
= CRYPTO_new_ex_data
:mrdocs:

Initialise `ad` for object `obj` of CRYPTO_EX_INDEX class `class_index.`

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_new_ex_data(
    int class_index,
    void* obj,
    xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA]* ad);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *class_index*
| CRYPTO_EX_INDEX_* identifying the owning object type.
| *obj*
| Owning object pointer passed to new‐index callbacks.
| *ad*
| Ex‐data structure embedded in (or associated with) `obj.`
|===


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