[#std-shared_lock-0b-2constructor-0a]
= xref:std.adoc[std]::xref:std/shared_lock-0b.adoc[shared_lock<folly::SharedMutexImpl<ReaderPriority, Tag_, Atom, Policy>>]::shared_lock
:relfileprefix: ../../
:mrdocs:

Constructs a lock that manages a mutex without acquiring it.

== Synopsis

Declared in `<folly/SharedMutex.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *mutex*
| Mutex to associate with this lock.
| *unused*
| Tag selecting deferred locking.
|===


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