[#ENGINE_free]
= ENGINE_free
:mrdocs:

Release one structural reference to an ENGINE.

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ENGINE_free(xref:ENGINE.adoc[ENGINE]* e);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Description

The ENGINE is destroyed only when its last structural reference is released.

== Return Value

Always 1.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE to free, or NULL (no‐op).
|===


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