#pragma once
#include <array>

class Particle {
public:
    static const int dim = 2;  // we are in two dimensions
    std::array<double, dim> pos{};

    // constructor, with a specified initial pos
    explicit Particle(std::array<double, dim> pos) {
        this->pos[0] = pos[0];
        this->pos[1] = pos[1];
    }
};