//

// Created by zing on 6/29/2020.

//

#include <vector>

#include <algorithm>

#include <iostream>

using namespace std;

auto main() -> int {

cout << "[lambda_capturing_by_reference.cpp]" << endl;

// Initializing a vector containing integer element

vector<int> vect;

vect.reserve(10);

for (int i = 0; i < 10; ++i)

vect.push_back(i);

// Displaying the elements of vect

cout << "Original Data:" << endl;

for_each(

begin(vect),

end(vect),

[](int n) {

cout << n << " ";

});

cout << endl;

// Initializing two variables

int a = 1;

int b = 1;

// Capturing value from the two variables

// and mutate them

for_each(

begin(vect),

end(vect),

[&a, &b](int &x) {

const int old = x;

x *= 2;

a = b;

b = old;

});

// Displaying the elements of vect

cout << "Squared Data:" << endl;

for_each(

begin(vect),

end(vect),

[](int n) {

cout << n << " ";

});

cout << endl << endl;

// Displaying value of variable a and b

cout << "a = " << a << endl;

cout << "b = " << b << endl;

[]() {

cout << "=========" << endl;

}();

return 0;

}