tgamma.hpp

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#ifndef STAN_MATH_PRIM_FUN_TGAMMA_HPP
#define STAN_MATH_PRIM_FUN_TGAMMA_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/is_nonpositive_integer.hpp>
#include <stan/math/prim/functor/apply_scalar_unary.hpp>
#include <cmath>
 
namespace stan {
namespace math {
 
inline double tgamma(double x) {
  if (x == 0.0 || is_nonpositive_integer(x)) {
    throw_domain_error("tgamma", "x", x, "x == 0 or negative integer");
  }
  return std::tgamma(x);
}
 
struct tgamma_fun {
  template <typename T>
  static inline auto fun(const T& x) {
    return tgamma(x);
  }
};
 
template <
    typename T,
    require_all_not_nonscalar_prim_or_rev_kernel_expression_t<T>* = nullptr,
    require_not_var_matrix_t<T>* = nullptr>
inline auto tgamma(const T& x) {
  return apply_scalar_unary<tgamma_fun, T>::apply(x);
}
 
}  // namespace math
}  // namespace stan
 
#endif