[#std-shared_lock-0b-mutex]
= xref:std.adoc[std]::xref:std/shared_lock-0b.adoc[shared_lock<folly::SharedMutexImpl<ReaderPriority, Tag_, Atom, Policy>>]::mutex
:relfileprefix: ../../
:mrdocs:

Returns the managed mutex without releasing ownership.

== Synopsis

Declared in `<folly/SharedMutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
xref:std/shared_lock-0b/mutex_type.adoc[mutex_type]*
mutex() const noexcept;
----

== Return Value

The managed mutex, or `nullptr` if none.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====

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