RotationEnumerator.h

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#ifndef INCLUDE_MOLASSEMBLER_STEREOPERMUTATIONS_ROTATION_ENUMERATOR_H
#define INCLUDE_MOLASSEMBLER_STEREOPERMUTATIONS_ROTATION_ENUMERATOR_H

#include "Molassembler/Stereopermutation/Stereopermutation.h"

#include <unordered_set>

namespace Scine {
namespace Molassembler {
namespace Stereopermutations {

class MASM_EXPORT RotationEnumerator {
public:
  using RotationSetType = std::vector<Stereopermutation>;

  RotationEnumerator(Stereopermutation initial, Shapes::Shape s);

  boost::optional<const Stereopermutation&> next();

  const RotationSetType& all();

private:
  bool incrementable() const;
  void increment();

  struct Link {
    unsigned rotationIndex;
    Stereopermutation permutation;

    Link(unsigned i, Stereopermutation s);
  };

  Shapes::Shape shape;
  unsigned linkLimit;
  std::vector<Link> chain;
  RotationSetType rotations;
};

} // namespace Stereopermutations
} // namespace Molassembler
} // namespace Scine

#endif