digamma.hpp

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#ifndef STAN_MATH_PRIM_FUN_DIGAMMA_HPP
#define STAN_MATH_PRIM_FUN_DIGAMMA_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/boost_policy.hpp>
#include <stan/math/prim/functor/apply_scalar_unary.hpp>
#include <boost/math/special_functions/digamma.hpp>
 
namespace stan {
namespace math {
 
template <typename T, require_arithmetic_t<T>* = nullptr>
inline double digamma(T&& x) {
  return boost::math::digamma(x, boost_policy_t<>());
}
 
struct digamma_fun {
  template <typename T>
  static inline auto fun(T&& x) {
    return digamma(std::forward<T>(x));
  }
};
 
template <typename T,
          require_not_nonscalar_prim_or_rev_kernel_expression_t<T>* = nullptr,
          require_container_t<T>* = nullptr,
          require_not_var_matrix_t<T>* = nullptr>
inline auto digamma(T&& x) {
  return apply_scalar_unary<digamma_fun, T>::apply(std::forward<T>(x));
}
 
}  // namespace math
}  // namespace stan
 
#endif