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Showing content from https://timsong-cpp.github.io/cppwp/n4659/thread.lock.unique.cons below:

[thread.lock.unique.cons]

unique_lock() noexcept;

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 == addressof(m) and owns == true.

unique_lock(mutex_type& m, defer_lock_t) noexcept;

Effects: Constructs an object of type unique_­lock.

Postconditions: pm == addressof(m) and owns == false.

unique_lock(mutex_type& m, try_to_lock_t);

Requires: The supplied Mutex type shall meet the Lockable requirements. 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 == addressof(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 owns the mutex.

Effects: Constructs an object of type unique_­lock.

Postconditions: pm == addressof(m) and owns == true.

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.

Effects: Constructs an object of type unique_­lock and calls m.try_­lock_­until(abs_­time).

Postconditions: pm == addressof(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.

Effects: Constructs an object of type unique_­lock and calls m.try_­lock_­for(rel_­time).

Postconditions: pm == addressof(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);

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 ]

~unique_lock();

Effects: If owns calls pm->unlock().

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