rev_matrix_type.hpp

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#ifndef STAN_MATH_REV_META_REV_MATRIX_TYPE_HPP
#define STAN_MATH_REV_META_REV_MATRIX_TYPE_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/meta.hpp>
#include <stan/math/rev/meta/is_var.hpp>
 
namespace stan {
 
template <int Rows, int Cols, typename... Inputs>
struct rev_matrix_type {
  using type = std::conditional_t<
      math::disjunction<math::conjunction<
          is_var<Inputs>, is_eigen<value_type_t<Inputs>>>...>::value,
      math::var_value<Eigen::Matrix<double, Rows, Cols>>,
      Eigen::Matrix<return_type_t<Inputs...>, Rows, Cols>>;
};
 
template <int Rows, int Cols, typename... Inputs>
using rev_matrix_t = typename rev_matrix_type<Rows, Cols, Inputs...>::type;
 
}  // namespace stan
 
#endif