[#OPENSSL_sk_reserve]
= OPENSSL_sk_reserve
:mrdocs:

Ensure a stack's internal array can hold at least `n` elements without reallocating.

== Synopsis

Declared in `<openssl/stack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OPENSSL_sk_reserve(
    xref:OPENSSL_STACK.adoc[OPENSSL_STACK]* st,
    int n);
----

== Return Value

1 on success, or 0 on allocation failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| Stack to resize.
| *n*
| Desired capacity.
|===


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