How is std :: unique_lock different from std :: lock_guard? In what situations is it better to use one class and in what other?
Answer 1, authority 100%
lock_guard and unique_lock are pretty much the same. The difference is that you can lock and unlock std :: unique_lock . std :: lock_guard will lock only once on build and unlock on destruction.
- lock_guard : when an object is created, it tries to acquire a mutex
(by callinglock ()) and when the object is destroyed it is automatically
frees the mutex (by callingunlock ()). - unique_lock : also supports deferred locking, temporary locking, recursive locking, and using conditional variables.