explicit lock_guard( mutex_type& m );
(1) (since C++11)
lock_guard( mutex_type& m, std::adopt_lock_t t );
(2) (since C++11)
lock_guard( const lock_guard& ) = delete;
(3) (since C++11)

Acquires ownership of the given mutex m.

1) Effectively calls m.lock().
2) Acquires ownership of the mutex m without attempting to lock it. The behavior is undefined if the current thread does not hold a non-shared lock (i.e., a lock acquired by lock, try_lock, try_lock_for, or try_lock_until) on m.
3) Copy constructor is deleted.

The behavior is undefined if m is destroyed before the lock_guard object is.


m - mutex to acquire ownership of.
t - tag parameter used to select non-locking version of the constructor.


1) Throws any exceptions thrown by m.lock().
2) Throws nothing.

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