[#ENGINE_free]
= ENGINE&lowbar;free
:mrdocs:

Release one structural reference to an ENGINE&period;

== Synopsis

Declared in `&lt;openssl&sol;engine&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
int
ENGINE&lowbar;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&period;

== Return Value

Always 1&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE to free, or NULL (no&hyphen;op)&period;
|===


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