module pind.samples.ja.pointers.pointers_9;

import std.stdio;
import std.conv;
import std.string;

struct Node {
    int element;
    Node * next;

    string toString() const {
        string result = to!string(element);

        if (next) {
            result ~= " -> " ~ to!string(*next);
        }

        return result;
    }
}

struct List {
    Node * head;

    void insertAtHead(int element) {
        head = new Node(element, head);
    }

    string toString() const {
        return format("(%s)", head ? to!string(*head) : "");
    }
}

void main() {
    List numbers;

    writeln("before: ", numbers);

    foreach (number; 0 .. 10) {
        numbers.insertAtHead(number);
    }

    writeln("after : ", numbers);
}