to_vector.hpp

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#ifndef STAN_MATH_REV_FUN_TO_VECTOR_HPP
#define STAN_MATH_REV_FUN_TO_VECTOR_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
 
namespace stan {
namespace math {
 
template <typename EigMat, require_eigen_t<EigMat>* = nullptr>
inline auto to_vector(const var_value<EigMat>& x) {
  using view_type = Eigen::Map<Eigen::Matrix<double, Eigen::Dynamic, 1>>;
  return var_value<view_type>(new vari_view<view_type>(
      view_type(x.vi_->val_.data(), x.rows() * x.cols()),
      view_type(x.vi_->adj_.data(), x.rows() * x.cols())));
}
 
}  // namespace math
}  // namespace stan
#endif