conditional_var_value.hpp

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#ifndef STAN_MATH_REV_META_CONDITIONAL_VAR_EIGEN_HPP
#define STAN_MATH_REV_META_CONDITIONAL_VAR_EIGEN_HPP
 
#include <stan/math/rev/core/var_value_fwd_declare.hpp>
#include <stan/math/rev/meta/plain_type.hpp>
#include <stan/math/prim/meta/promote_scalar_type.hpp>
 
namespace stan {
 
template <typename T_scalar, typename T_container, typename = void>
struct conditional_var_value {
  using type = std::conditional_t<is_var<scalar_type_t<T_scalar>>::value,
                                  math::var_value<math::promote_scalar_t<
                                      double, plain_type_t<T_container>>>,
                                  plain_type_t<T_container>>;
};
template <typename T_scalar, typename T_container>
struct conditional_var_value<T_scalar, T_container,
                             require_std_vector_t<T_container>> {
  using type = std::vector<typename conditional_var_value<
      T_scalar, value_type_t<T_container>>::type>;
};
 
template <typename T_scalar, typename T_container>
using conditional_var_value_t =
    typename conditional_var_value<T_scalar, T_container>::type;
 
}  // namespace stan
 
#endif