append_return_type.hpp

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#ifndef STAN_MATH_PRIM_META_APPEND_RETURN_TYPE_HPP
#define STAN_MATH_PRIM_META_APPEND_RETURN_TYPE_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/meta/return_type.hpp>
#include <vector>
 
namespace stan {
namespace math {
template <typename T1, typename T2>
struct append_return_type {
  using type = return_type_t<T1, T2>;
};
 
template <>
struct append_return_type<int, int> {
  using type = int;
};
 
template <typename T1, typename T2, int R, int C>
struct append_return_type<Eigen::Matrix<T1, R, C>, Eigen::Matrix<T2, R, C> > {
  using type = typename Eigen::Matrix<return_type_t<T1, T2>, R, C>;
};
 
template <typename T1, typename T2>
struct append_return_type<std::vector<T1>, std::vector<T2> > {
  using type = typename std::vector<typename append_return_type<T1, T2>::type>;
};
}  // namespace math
}  // namespace stan
#endif