to_complex.hpp

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#ifndef STAN_MATH_PRIM_FUN_TO_COMPLEX_HPP
#define STAN_MATH_PRIM_FUN_TO_COMPLEX_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/meta/return_type.hpp>
#include <complex>
 
namespace stan {
namespace math {
 
template <typename T = double, typename S = double,
          require_all_not_container_t<T, S>* = nullptr>
constexpr inline std::complex<stan::real_return_t<T, S>> to_complex(
    const T& re = 0, const S& im = 0) {
  return std::complex<stan::real_return_t<T, S>>(re, im);
}
 
template <typename T1, typename T2, require_any_container_t<T1, T2>* = nullptr,
          require_all_st_stan_scalar<T1, T2>* = nullptr>
inline auto to_complex(T1&& re, T2&& im) {
  return apply_scalar_binary(
      [](auto&& c, auto&& d) {
        return stan::math::to_complex(std::forward<decltype(c)>(c),
                                      std::forward<decltype(d)>(d));
      },
      std::forward<T1>(re), std::forward<T2>(im));
}
 
}  // namespace math
}  // namespace stan
 
#endif