Как передать в качестве параметра конструктора ПОТОК,

#include <iostream>
#include <stdio.h>
#include "notebook.h"
using namespace std;
 
int main (int argc, char* argv[])
{
  ifstream input("in.txt");
  
  Notebook book(input);
 
  book.print();
 
  return 0;
}

//notebook
#ifndef _NOTEBOOK_H_
 
#include <fstream>
#include "List.h"
#include "name.h"
 
using namespace std;
 
// Notebook  ========================================================================
class Notebook
{
private:
  List records; 
public:
  
  Notebook ();
  Notebook (ifstream input);
  ~Notebook ();
 
  void add (sName *newName); // adds an element in alphabet order with "Insert" method
  void print ();
  //void find (char*, char*, char*); // prints all the names corresponding the initials
};
//====================================================================================
 
#define _NOTEBOOK_H_
#endif

#include "notebook.h"
 
Notebook::Notebook () : records (){};
Notebook::~Notebook (){}
 
//returns first word? separated with spaces
string getWord (int& start, string line) {
  int i = start;  // iterator
  int n = 0;      //shows how many characters are in the word
  int len = line.length ();
  
  //skip spaces before
  for (; i < len; i++) {
    if (!isspace (line[i])) break;
  }
 
  while(!isspace (line[i + n]) && (i + n) != len) {
    n++;
  }
 
  return line.substr(i, n);
}
 
Notebook::Notebook (ifstream input) {
  string line, first, second, father;
  int i;
 
  while (!input.eof ()) {
    getline (input, line, '\n');
 
    first   = getWord (i, line);
    second  = getWord (i, line);
    father  = getWord (i, line);
 
    i = 0;
  }
}
 
 
void Notebook::add (sName *newName){
  Elem* cur = records.getFirst ();
  Elem* priv = cur; 
  if (cur == NULL){ //the list is empty
    records.add (newName);
    return;
  }
 
  while ( (*newName) <  *records.getData (cur)) {
    priv = cur;
    cur = records.getNext (cur);
    if (cur == NULL) { // reached the end of the list
      records.insert (newName, cur);
      return;
    }
  }
 
  records.insert (newName, priv);
}
 
 
void Notebook::print () {
  Elem* cur = records.getFirst ();
 
  while (cur != NULL) {
    sName name = *records.getData (cur);
    name.print ();
  }
}