#include <iostream>
#include <string>
using namespace std;

int main()
{
    string whatever = "kinda nice";

    // capture variables (by value) in the same scope
    auto havd = [=]()
    {
        cout << "Have a " << whatever <<" day\n";
    };
    havd();

    // capture variables (by reference) in the same scope
    auto hard = [&]()
    {
        whatever = "really nice";
        cout << "Have a " << whatever <<" day\n";
    };
    hard();

    cout << whatever << endl;

    // pass a value to the lambda expression
    auto argue = [](string arg)
    {
        cout << "Have a " << arg << " day\n";
    };

    argue(whatever);
    argue("fun");
}