Function PyDecimal_Check

python/pyarrow/src/arrow/python/decimal.cc:206–217

}

bool PyDecimal_Check(PyObject* obj) {
  static OwnedRef decimal_type;
  if (!decimal_type.obj()) {
    ARROW_CHECK_OK(ImportDecimalType(&decimal_type));
    ARROW_DCHECK(PyType_Check(decimal_type.obj()));
  }
  // PyObject_IsInstance() is slower as it has to check for virtual subclasses
  const int result =
      PyType_IsSubtype(Py_TYPE(obj), reinterpret_cast<PyTypeObject*>(decimal_type.obj()));
  ARROW_CHECK_NE(result, -1) << " error during PyType_IsSubtype check";
  return result == 1;
}

bool PyDecimal_ISNAN(PyObject* obj) {
  ARROW_DCHECK(PyDecimal_Check(obj)) << "obj is not an instance of decimal.Decimal";