module pind.samples.ja.foreach__opapply.foreach_opapply_1;

import std.stdio;

enum Color { blue, green, red }

struct Point {
    int x;
    int y;
}

struct Polygon {
    Color color;
    Point[] points;

    int opApply(int delegate(ref const(Point)) dg) const {
        int result = 0;

        foreach (point; points) {
            result = dg(point);

            if (result) {
                break;
            }
        }

        return result;
    }
}

void main() {
    auto polygon = Polygon(Color.blue,
                           [ Point(0, 0), Point(1, 1) ] );

    foreach (point; polygon) {
        writeln(point);
    }
}