module pind.samples.ja.interface.interface_2;

import std.stdio;

struct Point {
    size_t id;    // オブジェクトID
    int line;
    int column;

    // 次のオブジェクトに使用するID
    static size_t nextId;

    this(int line, int column) {
        this.line = line;
        this.column = column;
        this.id = makeNewId();
    }

    static size_t makeNewId() {
        immutable newId = nextId;
        ++nextId;
        return newId;
    }
}

void main() {
    auto top = Point(7, 0);
    auto middle = Point(8, 0);
    auto bottom =  Point(9, 0);

    writeln(top.id);
    writeln(middle.id);
    writeln(bottom.id);
}