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Modify element in node of linked list with value assignment

azad90 (16)
Hei guys, hope that you could lend a hand to solve this problem

I tried to modify staff name with an assignment value of other string but couldn't work it out. I managed to modify it by key in cin >>.

The purpose is that I want to assign string value from other different class to Staff class. An
error : no match for 'operator=' in '* updateName = newStaffName'
and
note: no known conversion for argument 1 from 'std::string {aka std::basic_string<char>}' to 'const Staff&'
occurred.

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#include <iostream>

using namespace std;

class Staff {

    friend ostream& operator << (ostream& os, Staff& m) {
    os << "[" << m.ID << ", " << m.fName << "]";
    return os;
  }
  private :
  int ID = 0;
  string fName;
  public:
  Staff() {}
  Staff (int ID, string fName) : ID(ID), fName(fName){}
//  Staff (string fName) : fName(fName){}

  int getID(){return ID;}
  string getFName() { return fName; }
  void setFName(string fName) {this -> fName = fName;}

  friend istream& operator >> (istream& is, Staff& m) {
    is >> m.fName;
    return is;
  }
};


template <typename T>
struct Node {
  T info;
  Node<T> *next;
};

template <typename T>
class LinkedList {
  Node<T> *start;
public:
  LinkedList() { start = NULL; }
  ~LinkedList() {
      while (start != NULL){
        Node <T> *ptr =start;
        start = start -> next;
        delete ptr;
        }
    }

  void insertFront (T& newElement) {
    Node<T>* newNode = new Node<T>;
    newNode->info = newElement;
    newNode->next = start;
    start = newNode;
  }

    bool retrieve (int targetindex, T*& retrievedName) {

    if (targetindex < 0 || start == NULL)
      return false;
    Node<T>* ptr = start;
    int i = 1;
    while (ptr != NULL && i <= targetindex) {
      if (i == targetindex) {
        retrievedName = &(ptr -> info);
        return true;
      }
      else {
        ptr = ptr->next;
       ++i;
      }
    }
    return false;
  }

    friend ostream& operator<< (ostream& os, LinkedList<T>& list) {
    os << "Staff : \n";
    Node<T> *ptr = list.start;
    int i = 1;
    while (ptr != NULL) {
      os << i++ << ". " << ptr->info << endl;
      ptr = ptr->next;
    }
    return os;
  }

};

int main() {
  LinkedList<Staff> s;
  Staff newStaff, *updateName;
  int targetIndex;
  bool found;
  string newStaffName = "Sara";

  newStaff = Staff(111, "Elene");
  s.insertFront(newStaff);
  newStaff = Staff(222, "Mary");
  s.insertFront(newStaff);
  newStaff = Staff(333, "Jane");
  s.insertFront(newStaff);
  newStaff = Staff(444, "Eddy");
  s.insertFront(newStaff);
  newStaff = Staff(555, "Jack");
  s.insertFront(newStaff);

  cout << s << endl;
  cout << "Enter index of staff to be modified : ";
  cin >> targetIndex;
  found = s.retrieve (targetIndex, updateName);
    if (!found)
        cout << "No such index\n";
    else {
  cout << *updateName << " going to be changed\n\n";
  *updateName = newStaffName;
//    cout << "Enter new name : ";
//    cin >> *updateName;
    }

    cout << s << endl;

}
keskiverto (10363)
Your updateName is a pointer to a Staff object.

If you had a simpler program without a list, what this code would do?
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Staff newStaff;
newStaff = Staff(111, "Elene");
Staff * newName;

newStaff = "Mary";
newStaff.setFName( "Jack" );

newName = &newStaff;
*newName = "Jane";
newName->setFName( "Eddy" );
Last edited on
azad90 (16)
First, thanks for the reply keskiverto

If you had a simpler program without a list, what this code would do?


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Staff newStaff;
newStaff = Staff(111, "Elene");
Staff * newName;

newStaff = "Mary";
newStaff.setFName( "Jack" );

newName = &newStaff;
*newName = "Jane";
newName->setFName( "Eddy" );


I don't really get it when it comes to linked list. Can you explain it a little bit?
azad90 (16)
Never mind.. Now, I understand. Thanks a lot keskiverto
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