Quaternion.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/tensors/PrimitiveTensor.h"
 
namespace neml2
{
class R2;
class Scalar;
class Quaternion : public PrimitiveTensor<Quaternion, 4>
{
public:
  using PrimitiveTensor<Quaternion, 4>::PrimitiveTensor;
 
  static Quaternion fill(const Scalar & s, const Scalar & q1, const Scalar & q2, const Scalar & q3);
 
  static Quaternion fill(const Real & s,
                         const Real & q1,
                         const Real & q2,
                         const Real & q3,
                         const torch::TensorOptions & options = default_tensor_options());
 
  Scalar operator()(Size i) const;
 
  R2 to_R2() const;
};
} // namespace neml2