domino.h

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#ifndef DMN_DOMINO_H
#define DMN_DOMINO_H 1


namespace dmn
{
  const int invalid_half = -1;

  class HalfDomino
  {
  private:
    int half_;

  public:
    HalfDomino();

    HalfDomino(const int half);

    int half() const;

    bool is_valid() const;

    operator int() const;

    friend bool operator==(const HalfDomino& halfdomino1,
         const HalfDomino& halfdomino2);

    friend bool operator!=(const HalfDomino& halfdomino1,
         const HalfDomino& halfdomino2);
  };

  class Domino
  {
  private:
    HalfDomino half1_;
    HalfDomino half2_;

  public:
    Domino();

    Domino(const HalfDomino& half1, const HalfDomino& half2);

    HalfDomino half1() const;

    HalfDomino half2() const;

    bool is_double() const;

    bool has_half(const HalfDomino& half) const;

    void reverse();

    friend bool operator==(const Domino& domino1, const Domino& domino2);

    friend bool operator!=(const Domino& domino1, const Domino& domino2);
  };

  // Invalid values
  const HalfDomino HALFDOMINO_NULL(invalid_half);
  const Domino DOMINO_NULL(HALFDOMINO_NULL, HALFDOMINO_NULL);
};


#endif // DMN_DOMINO_H

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