Effects: Constructs an object of type unique_lock.
Postconditions: pm == 0 and owns == false.
explicit unique_lock(mutex_type& m);
Requires: If mutex_type is not a recursive mutex the calling thread does not own the mutex.
Effects: Constructs an object of type unique_lock and calls m.lock().
Postconditions: pm == &m and owns == true.
unique_lock(mutex_type& m, defer_lock_t) noexcept;
Effects: Constructs an object of type unique_lock.
Postconditions: pm == &m and owns == false.
unique_lock(mutex_type& m, try_to_lock_t);
Requires: The supplied Mutex type shall meet the Lockable requirements ([thread.req.lockable.req]). If mutex_type is not a recursive mutex the calling thread does not own the mutex.
Effects: Constructs an object of type unique_lock and calls m.try_lock().
Postconditions: pm == &m and owns == res, where res is the value returned by the call to m.try_lock().
unique_lock(mutex_type& m, adopt_lock_t);
Requires: The calling thread own the mutex.
Effects: Constructs an object of type unique_lock.
Postconditions: pm == &m and owns == true.
Throws: Nothing.
template <class Clock, class Duration>
unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
Requires: If mutex_type is not a recursive mutex the calling thread does not own the mutex. The supplied Mutex type shall meet the TimedLockable requirements ([thread.req.lockable.timed]).
Effects: Constructs an object of type unique_lock and calls m.try_lock_until(abs_time).
Postconditions: pm == &m and owns == res, where res is the value returned by the call to m.try_lock_until(abs_time).
template <class Rep, class Period>
unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
Requires: If mutex_type is not a recursive mutex the calling thread does not own the mutex. The supplied Mutex type shall meet the TimedLockable requirements ([thread.req.lockable.timed]).
Effects: Constructs an object of type unique_lock and calls m.try_lock_for(rel_time).
Postconditions: pm == &m and owns == res, where res is the value returned by the call to m.try_lock_for(rel_time).
unique_lock(unique_lock&& u) noexcept;
Postconditions: pm == u_p.pm and owns == u_p.owns (where u_p is the state of u just prior to this construction), u.pm == 0 and u.owns == false.
unique_lock& operator=(unique_lock&& u) noexcept;
Effects: If owns calls pm->unlock().
Postconditions: pm == u_p.pm and owns == u_p.owns (where u_p is the state of u just prior to this construction), u.pm == 0 and u.owns == false.
[ Note: With a recursive mutex it is possible for both *this and u to own the same mutex before the assignment. In this case, *this will own the mutex after the assignment and u will not. — end note ]
Effects: If owns calls pm->unlock().