#ifndef VEC2_HPP
#define VEC2_HPP

#include <cmath>

// Inline constant – visible to every translation unit.
inline constexpr double pi = 3.14159265358979323846;

struct Vec2 {
    double x{};
    double y{};

    // Defaulted constructors.
    Vec2() = default;
    Vec2(double x_, double y_);

    // Returns the squared length – useful for comparisons.
    double length_sq() const;

    // Returns the Euclidean length.
    double length() const;

    // Adds another vector to this one.
    void add(const Vec2& other);
};

#endif // VEC2_HPP