Operator Overloading

Give operators like +, == and << meaning for your own types.

Intermediate

struct Complex {
    double re, im;
    Complex operator+(const Complex &o) const { return {re + o.re, im + o.im}; }
    bool operator==(const Complex &o) const = default;   // C++20
};

std::ostream &operator<<(std::ostream &os, const Complex &c) {
    return os << c.re << " + " << c.im << "j";
}

Overload operators only when the meaning is obvious (maths types, comparisons, streaming). Don't make + do something surprising.

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