Effects: Constructs an object of type shared_lock.
Postconditions: pm == nullptr and owns == false.
explicit shared_lock(mutex_type& m);
Requires: The calling thread does not own the mutex for any ownership mode.
Effects: Constructs an object of type shared_lock and calls m.lock_shared().
Postconditions: pm == addressof(m) and owns == true.
shared_lock(mutex_type& m, defer_lock_t) noexcept;
Effects: Constructs an object of type shared_lock.
Postconditions: pm == addressof(m) and owns == false.
shared_lock(mutex_type& m, try_to_lock_t);
Requires: The calling thread does not own the mutex for any ownership mode.
Effects: Constructs an object of type shared_lock and calls m.try_lock_shared().
Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_lock_shared().
shared_lock(mutex_type& m, adopt_lock_t);
Requires: The calling thread has shared ownership of the mutex.
Effects: Constructs an object of type shared_lock.
Postconditions: pm == addressof(m) and owns == true.
template <class Clock, class Duration>
shared_lock(mutex_type& m,
const chrono::time_point<Clock, Duration>& abs_time);
Requires: The calling thread does not own the mutex for any ownership mode.
Effects: Constructs an object of type shared_lock and calls m.try_lock_shared_until(abs_time).
Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_lock_shared_until(abs_time).
template <class Rep, class Period>
shared_lock(mutex_type& m,
const chrono::duration<Rep, Period>& rel_time);
Requires: The calling thread does not own the mutex for any ownership mode.
Effects: Constructs an object of type shared_lock and calls m.try_lock_shared_for(rel_time).
Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_lock_shared_for(rel_time).
Effects: If owns calls pm->unlock_shared().
shared_lock(shared_lock&& sl) noexcept;
Postconditions: pm == sl_p.pm and owns == sl_p.owns (where sl_p is the state of sl just prior to this construction), sl.pm == nullptr and sl.owns == false.
shared_lock& operator=(shared_lock&& sl) noexcept;
Effects: If owns calls pm->unlock_shared().
Postconditions: pm == sl_p.pm and owns == sl_p.owns (where sl_p is the state of sl just prior to this assignment), sl.pm == nullptr and sl.owns == false.