reference

e.g.1

#include <iostream>

void func(int& x)
{
    x+=5;
}
int main(void)
{
    int v=3;
    func(v);
    std::cout << v << std::endl;
    return 0;
}

e.g.2

#include <iostream>

class Thing
{
    int data;
public:
    int & AccessData(){ return data; }
};

int main(void)
{
    Thing one;
    one.AccessData()=1;
    std::cout << one.AccessData() << std::endl;
    return 0;
}

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