[#CRYPTO_get_ex_new_index]
= CRYPTO_get_ex_new_index
:mrdocs:

Allocate a new application‐specific ex_data index for a CRYPTO_EX_INDEX_* class.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_get_ex_new_index(
    int class_index,
    long argl,
    void* argp,
    xref:CRYPTO_EX_new.adoc[CRYPTO_EX_new]* new_func,
    xref:CRYPTO_EX_dup.adoc[CRYPTO_EX_dup]* dup_func,
    xref:CRYPTO_EX_free.adoc[CRYPTO_EX_free]* free_func);
----

== Return Value

Non‐negative index on success, or ‐1 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *class_index*
| CRYPTO_EX_INDEX_* identifying the object class.
| *argl*
| Opaque long passed to the new/dup/free callbacks.
| *argp*
| Opaque pointer passed to the new/dup/free callbacks.
| *new_func*
| Optional constructor callback, or NULL.
| *dup_func*
| Optional duplication callback, or NULL.
| *free_func*
| Optional destructor callback, or NULL.
|===


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