# Xyz.h
class Xyz
{
public:
    Xyz(int iVal);

    Xyz operator+(Xyz other);
protected:
    int i_val;
};

# Xyz.cpp
Xyz::Xyz(int iVal)
{
    this->i_val = iVal;
}

Xyz Xyz::operator+(Xyz other)
{
    return Xyz(this->i_val + other.i_val);
}

# Main.cpp
Xyz *x;
Xyz *y;
Xyz *z;

x = new Xyz(10);
y = new Xyz(20);

z = x + y;