Comparisons.hh

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#ifndef CASM_Comparisons
#define CASM_Comparisons

namespace CASM {

  template<typename Derived>
  struct Comparisons {

    bool operator>(const Derived &B) const {
      return B < derived();
    };

    bool operator<=(const Derived &B) const {
      return !(B < derived());
    };

    bool operator>=(const Derived &B) const {
      return !(derived() < B);
    };

    bool operator==(const Derived &B) const {
      return derived()._eq(B);
    };

    bool operator!=(const Derived &B) const {
      return derived()._ne(B);
    };


  protected:

    const Derived &derived() const {
      return *static_cast<const Derived *>(this);
    }

    bool _eq(const Derived &B) const {
      return (!(derived() < B) && !(B < derived()));
    };

    bool _ne(const Derived &B) const {
      return !derived()._eq(B);
    };

  };

}

#endif