std::unique_lock<Mutex>::~unique_lock
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std::unique_lock 
 
 Member functions
unique_lock::~unique_lock
 Locking
 Modifiers
 Observers
 Non-member functions
~unique_lock();
 
 (since C++11) 
Destroys the lock. If *this has an associated mutex and has acquired ownership of it, the mutex is unlocked.