AtomPairOverlap.h

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#ifndef SPARROW_ATOMPAIROVERLAP_H
#define SPARROW_ATOMPAIROVERLAP_H

#include "GTOOverlapMatrixBlock.h"
#include <Utils/Math/DerivOrderEnum.h>
#include <Eigen/Core>

namespace Scine {

namespace Utils {
class AtomicGtos;
}

namespace Sparrow {

namespace nddo {

template<Utils::DerivativeOrder O>
class AtomPairOverlap {
 public:
  using Value3D = Utils::AutomaticDifferentiation::Value3DType<O>;

  Eigen::Matrix<Value3D, Eigen::Dynamic, Eigen::Dynamic>
  getMatrixBlock(const Utils::AtomicGtos& pA, const Utils::AtomicGtos& pB, Eigen::Vector3d Rab) const;

 private:
  Eigen::Matrix<Value3D, Eigen::Dynamic, Eigen::Dynamic> getInitialBlock(const Utils::AtomicGtos& pA,
                                                                         const Utils::AtomicGtos& pB) const;
};

} // namespace nddo

} // namespace Sparrow
} // namespace Scine
#endif // SPARROW_ATOMPAIROVERLAP_H