#pragma once

#include <string>
#include <iostream>

class Rail
{

public:

    Rail () = default;

    virtual ~Rail () = default;
    
    virtual void travel (std::istream & is);
    virtual void visit ();
    void connect (Rail * rail);
    
protected:

    void travel_to (std::istream & is, Rail * target);
    
    bool visited { false };
    Rail * to { nullptr };
    
};

class Junction : public Rail
{
public:

    Junction () = default;

    void travel (std::istream & is) override;
    void visit () override;
    void connect (Rail * forward, Rail * other);

private:

    char ans;
    Rail * right { nullptr };
    
};

class Destination : public Rail
{

public:

    Destination (std::string const & name);
    void travel (std::istream & is) override;

private:

    std::string name { };
    
};