#include <iostream>

using namespace std ;

int factory(int i)
{
		return i * 10;
}


int main()
{
	int x1 = 100 ;
	//A new x1 is created in the lambda
	auto f1 = [ x1 = 5 ]
		{
			//Does not change the outer x1
			cout << "Inside the lambda " <<  " x1: " <<  x1 << endl ;
			return x1 ;
		}; // returns 20

    cout << "f1() " << f1() << " x1: " <<  x1 << endl ;

    // x1 is an internal variable local to the
    //lambda
	auto f2 = [ x1 = factory(2) ]
	{
		return x1 ;
	}; // returns 20

    cout << "f2() " << f2() << " x1: " <<  x1 << endl ;

	auto generator = [x2 = 0] () mutable {
	  // this would not compile without 'mutable' as we are modifying x on each call
	  return x2++ ;
	};
	auto a1 = generator(); // == 0
	auto b1 = generator(); // == 1
	auto c1 = generator(); // == 2


   cout << "a1: " << a1  << endl ;
   cout << "b1: " << b1  << endl ;
   cout << "c1: " << c1  << endl ;

}