void wait(unique_lock<mutex>& lock, Predicate pred)中的Predicate pred是什么

& lock) {
// Release the lock and wait until notified
lock.unlock();
m_cv.wait(lock);
// Reacquire the lock
lock.lock();
}

This function releases the lock held by the unique_lock object and waits until it is notified by another thread. The unique_lock object is passed by reference to the function. The function first releases the lock by calling the unlock() method of the unique_lock object. It then waits on the condition variable m_cv by calling its wait() method, passing the unique_lock object as an argument. This will cause the thread to wait until it is notified by another thread that calls notify_one() or notify_all() on the same condition variable.

Once the thread is notified, it will wake up and reacquire the lock by calling the lock() method of the unique_lock object. This ensures that the thread has exclusive access to the shared data before it proceeds with its task.