pow.hpp

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#ifndef STAN_MATH_PRIM_FUN_POW_HPP
#define STAN_MATH_PRIM_FUN_POW_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <stan/math/prim/fun/square.hpp>
#include <stan/math/prim/functor/apply_scalar_binary.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
namespace internal {
 
template <typename U, typename V>
inline complex_return_t<U, V> complex_pow(const U& x, const V& y) {
  return exp(y * log(x));
}
}  // namespace internal
 
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
inline auto pow(const std::complex<T1>& a, const std::complex<T2>& b) {
  return std::pow(a, b);
}
 
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
inline auto pow(const T1& a, const std::complex<T2>& b) {
  return std::pow(a, b);
}
 
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
inline auto pow(const std::complex<T1>& a, const T2& b) {
  return std::pow(a, b);
}
 
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
inline auto pow(const T1& a, const T2& b) {
  return std::pow(a, b);
}
template <typename T1, typename T2, require_any_container_t<T1, T2>* = nullptr,
          require_all_not_matrix_st<is_var, T1, T2>* = nullptr,
          require_all_arithmetic_t<base_type_t<T1>, base_type_t<T2>>* = nullptr>
inline auto pow(const T1& a, const T2& b) {
  return apply_scalar_binary(
      // Qualified pow since only Arithmetic types are accepted here
      a, b, [](const auto& c, const auto& d) { return stan::math::pow(c, d); });
}
}  // namespace math
}  // namespace stan
#endif