value_of_rec.hpp

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#ifndef STAN_MATH_PRIM_FUN_VALUE_OF_REC_HPP
#define STAN_MATH_PRIM_FUN_VALUE_OF_REC_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <complex>
#include <cstddef>
#include <vector>
 
namespace stan {
namespace math {
 
template <typename T, typename = require_stan_scalar_t<T>>
inline double value_of_rec(const T x) {
  return static_cast<double>(x);
}
 
inline double value_of_rec(double x) { return x; }
 
template <typename T>
inline std::complex<double> value_of_rec(const std::complex<T>& x) {
  return {value_of_rec(x.real()), value_of_rec(x.imag())};
}
 
template <typename T, require_not_same_t<double, T>* = nullptr>
inline std::vector<double> value_of_rec(const std::vector<T>& x) {
  size_t x_size = x.size();
  std::vector<double> result(x_size);
  for (size_t i = 0; i < x_size; i++) {
    result[i] = value_of_rec(x[i]);
  }
  return result;
}
 
template <typename T, require_std_vector_t<T>* = nullptr,
          require_vt_same<double, T>* = nullptr>
inline T value_of_rec(T&& x) {
  return std::forward<T>(x);
}
 
template <typename T, typename = require_not_st_same<T, double>,
          typename = require_eigen_t<T>>
inline auto value_of_rec(T&& M) {
  return make_holder(
      [](auto& m) {
        return m.unaryExpr([](auto x) { return value_of_rec(x); });
      },
      std::forward<T>(M));
}
 
template <typename T, typename = require_st_same<T, double>,
          typename = require_eigen_t<T>>
inline T value_of_rec(T&& x) {
  return std::forward<T>(x);
}
}  // namespace math
}  // namespace stan
 
#endif