#include <iostream>
#include <thread>
#include <vector>
#include <cmath>

using namespace std;

struct Point { double x,y; };
vector<Point> points;
typedef vector<Point>::const_iterator Vci;

class Circle {
    private:
        double r;
        Point p0;

        bool in(const Point &p) {
            return (pow(p.x-p0.x,2)+pow(p.y-p0.y,2) <= pow(r,2));
        }

    public:
        Circle(const Point& t, const double r_) : p0(t), r(r_) { }
        void operator()(const vector<Point> p, vector<bool>& belong);
};

void Circle::operator()(const vector<Point> p, vector<bool>& belong) {
    for (int i=0; i<p.size(); i++)
        belong[i] = in(p[i]);

}


int main() {
    Circle k({0,0}, 3);
    vector<Point> p={{1,3}, {3,3}, {0,0}, {1,1}};
    vector<bool> b(p.size());

    thread t(k, p, ref(b));
    t.join();

    for (int i=0; i<b.size(); i++) {
        cout << "Tacka " << i << " {" << p[i].x << ", " << p[i].y << "}";
        if (b[i])
            cout << " je u krugu" << endl;
        else
            cout << " nije u krugu" << endl;
    }
    return 0;
}