base_type.hpp

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#ifndef STAN_MATH_PRIM_META_BASE_TYPE_HPP
#define STAN_MATH_PRIM_META_BASE_TYPE_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/meta/is_complex.hpp>
#include <stan/math/prim/meta/is_eigen.hpp>
#include <stan/math/prim/meta/value_type.hpp>
#include <stan/math/prim/meta/is_vector.hpp>
#include <type_traits>
#include <vector>
 
namespace stan {
 
template <typename T, typename = void>
struct base_type {
  using type = std::decay_t<T>;
};
 
template <typename T>
using base_type_t = typename base_type<T>::type;
 
template <typename T>
struct base_type<T, std::enable_if_t<is_std_vector<T>::value>> {
  using type = base_type_t<typename std::decay_t<T>::value_type>;
};
 
template <typename T>
struct base_type<T, std::enable_if_t<is_eigen<T>::value>> {
  using type = base_type_t<typename std::decay_t<T>::Scalar>;
};
 
template <typename T>
struct base_type<T, std::enable_if_t<is_complex<T>::value>> {
  using type = base_type_t<typename std::decay_t<T>::value_type>;
};
 
}  // namespace stan
#endif