std::lock_guard::lock_guard

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(). The behavior is undefined if m is not a recursive mutex and the current thread already owns m.

2) Acquires ownership of the mutex m without attempting to lock it. The behavior is undefined if the current thread does not own 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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