assignment 5

[Haotian-Shi-cyber]

void LinkedListPatientQueue::upgradePatient(string name, int newPriority) {
    if (front == nullptr) { //error case
        throw("Invalid Operation: The queue of patients is empty.");
    } else {
        PatientNode* current = front;
        while (current->next != nullptr && current->next->name != name) {
            current = current->next;
        }
        if (current->next == nullptr) { //error case
            throw("Invalid Operation: There is no patient with the given name.");
        } else {
            PatientNode* toModify = current->next;
            if (toModify->priority < newPriority) { //error case
                throw("Invalid Operation: The priority of the patient is already greater than the"
                " new priority.");
            } else {
                current->next = toModify->next;
                newPatient(toModify->name, newPriority);
                delete toModify; //preventing memory leak.
            }
        }
    }
}

in linked list implementation cpp file, function upgradepatient, this code doesn't consider when you want to change the priority of frontname, an error would generate.