#include <algorithm>
#include <array>
#include <string>
#include <functional>
#include <iostream>

using namespace std ;



int main()
{
  //using the mutable keyword
  //we can change the value in the lambda function
  //but that change is not refected in the code calling
  //the lambda function

  int a1 = 1;
  int b1 = 1;

  cout << "In main():" << endl;
  cout << "a1 = " << a1 << ", ";
  cout << "b1 = " << b1 << endl;
  cout << endl;

  auto add_one = [a1, &b1] () mutable {
			// modify both a1 & b1
			a1++;
			b1++;
			cout << "In add_one():" << endl;
			cout << "a1 = " << a1 << ", ";
			cout << "b1 = " << b1 << endl;
		  };

  add_one();
  add_one();

  cout << endl;
  cout << "In main() After calling the lambda function:" << endl;
  cout << "a1 = " << a1 << ", ";
  cout << "b1 = " << b1 << endl;



}