[#CRYPTO_dup_ex_data]
= CRYPTO_dup_ex_data
:mrdocs:

Duplicate CRYPTO_EX_DATA entries from `from` into `to` for a class.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_dup_ex_data(
    int class_index,
    xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA]* to,
    xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA] const* from);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *class_index*
| CRYPTO_EX_INDEX_* identifying the object class.
| *to*
| Destination ex_data container (typically freshly initialized).
| *from*
| Source ex_data to copy.
|===


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