#include <iostream>
#include <sstream>
#include <string>

using namespace std;

class Person
{
public:
  Person():
    name{}, age{}
  {}

  friend istream& operator>>(istream & lhs, Person & rhs)
  {
    cout << "Setting the Person objects datamembers using istream" << endl;
    string n;
    char trash;
    int a;

    lhs >> n >> trash >> a;
    rhs.name = n;

    if( a > 0 )
    {
      rhs.age = a;
    }
    else //input is wrong
    {
      lhs.setstate(ios_base::failbit);
      cerr << "Incorrect input, age needs to be >= 0" << endl;
      rhs.age = 0;
    }
        
    return lhs;
  }

private:
  string name;
  int age;
};

int main()
{
  // Utan problem
  Person p1{};
  istringstream iss1{"Pontus , 30"};
  iss1 >> p1;
  cout << "Failbit is set: ";
  if( iss1.fail() )
  {
    cout << "True" << endl;
  }
  else
  {
    cout << "False" << endl;
  }

  cout << '\n';

  // Med problem (fel format på inmatning)
  Person p2{};
  istringstream iss2{"Janos , -25"};
  iss2 >> p2;
  cout << "Failbit is set: ";
  if( iss2.fail() )
  {
    cout << "True" << endl;
  }
  else
  {
    cout << "False" << endl;
  }
}