empty.hpp

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#ifndef KAGOME_EMPTY
#define KAGOME_EMPTY

namespace kagome {

  struct Empty {
    bool operator==(const Empty &) const {
      return true;
    }
  };

  template <class Stream>
  Stream &operator<<(Stream &s, const Empty &) {
    return s;
  }

  template <class Stream>
  Stream &operator>>(Stream &s, Empty &) {
    return s;
  }

}  // namespace kagome

#endif  // KAGOME_EMPTY