C++11 Mutex Unique_lock and Lock_guard differences

There is an area lock Lock_guard in the c++11, and a second zone lock Unique_lock.

The area lock Lock_guard is simple to use and is valid throughout the region except for the constructor function, which has no other member function.

In addition to the Lock_guard function, the area lock Unique_guard provides more member_function and is relatively flexible.

The most useful set of functions for Unique_guard are:

Lock	Locks the associated mutex (Public member function)
Try_lock	Tries to lock the associated mutex, returns if the mutex isn't available (Public member function)
Try_lock_for	Attempts to lock the associated timedlockable mutex, returns if the mutex has been for the unavailable time specified tion (Public member function)
Try_lock_until	Tries to lock the associated timedlockable mutex, returns if the mutex has been unavailable until specified time point has Been reached (Public member function)
Unlock	Unlocks the associated mutex

Through the above function, the lock/unlock can be more flexible control of the range of locks, reduce the size of the lock.

By Try_lock_for/try_lock_until, you can control the wait time for locking, which is an optimistic lock.

The above is a superficial understanding, there are new ideas in addition.