[#OPENSSL_sk_set]
= OPENSSL_sk_set
:mrdocs:

Replace the pointer at index `i` in a stack.

== Synopsis

Declared in `<openssl/stack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
OPENSSL_sk_set(
    xref:OPENSSL_STACK.adoc[OPENSSL_STACK]* st,
    int i,
    void const* data);
----

== Return Value

Previous pointer at `i,` or NULL if `i` is out of range.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| Stack to update.
| *i*
| Zero‐based index of the slot to replace.
| *data*
| New element pointer stored at `i.`
|===


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