[#std-lock_guard-02]
= xref:std.adoc[std]::lock_guard<Mutex>
:relfileprefix: ../
:mrdocs:

Deduces `std::lock_guard` when adopting existing lock state.

== Synopsis

Declared in `<folly/synchronization/Lock.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Mutex,
    typename S>
lock_guard<Mutex>(
    Mutex&,
    xref:folly/adopt_lock_state_t.adoc[folly::adopt_lock_state_t],
    S) -> lock_guard<Mutex>;
----


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