partials_return_type.hpp

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#ifndef STAN_MATH_PRIM_META_PARTIALS_RETURN_TYPE_HPP
#define STAN_MATH_PRIM_META_PARTIALS_RETURN_TYPE_HPP
 
#include <stan/math/prim/meta/partials_type.hpp>
#include <stan/math/prim/meta/promote_args.hpp>
#include <stan/math/prim/meta/scalar_type.hpp>
#include <type_traits>
 
namespace stan {
 
template <typename T, typename... T_pack>
struct partials_return_type {
  using type = promote_args_t<double, partials_type_t<scalar_type_t<T>>,
                              typename partials_return_type<T_pack...>::type>;
};
 
template <typename T>
struct partials_return_type<T> {
  using type = promote_args_t<double, partials_type_t<scalar_type_t<T>>>;
};
 
template <typename... Args>
using partials_return_t = typename partials_return_type<Args...>::type;
 
}  // namespace stan
#endif