// Ceres Solver - A fast non-linear least squares minimizer
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// http://ceres-solver.org/
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// Author: sameeragarwal@google.com (Sameer Agarwal)

#ifndef CERES_INTERNAL_EIGEN_VECTOR_OPS_H_
#define CERES_INTERNAL_EIGEN_VECTOR_OPS_H_

#include "ceres/internal/eigen.h"

namespace ceres::internal {

// Blas1 operations on Eigen vectors. These functions are needed as an
// abstraction layer so that we can use different versions of a vector style
// object in the conjugate gradients linear solver.
inline double Norm(const Vector& x) { return x.norm(); }
inline void SetZero(Vector& x) { x.setZero(); }
inline void Axpby(
    double a, const Vector& x, double b, const Vector& y, Vector& z) {
  z = a * x + b * y;
}
inline double Dot(const Vector& x, const Vector& y) { return x.dot(y); }
inline void Copy(const Vector& from, Vector& to) { to = from; }

}  // namespace ceres::internal

#endif  // CERES_INTERNAL_EIGEN_VECTOR_OPS_H_