[#OPENSSL_sk_set_cmp_func]
= OPENSSL_sk_set_cmp_func
:mrdocs:

Install a comparison function on a stack and mark it as unsorted.

== Synopsis

Declared in `<openssl/stack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OPENSSL_sk_compfunc.adoc[OPENSSL_sk_compfunc]
OPENSSL_sk_set_cmp_func(
    xref:OPENSSL_STACK.adoc[OPENSSL_STACK]* sk,
    xref:OPENSSL_sk_compfunc.adoc[OPENSSL_sk_compfunc] cmp);
----

== Return Value

Previous comparison function, or NULL.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *sk*
| Stack to update.
| *cmp*
| New comparison callback, or NULL to clear ordering.
|===


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