Function xgboost_sys::XGBoosterGetAttr

pub unsafe extern "C" fn XGBoosterGetAttr(
    handle: BoosterHandle,
    key: *const c_char,
    out: *mut *const c_char,
    success: *mut c_int
) -> c_int

\brief Get string attribute from Booster. \param handle handle \param key The key of the attribute. \param out The result attribute, can be NULL if the attribute do not exist. \param success Whether the result is contained in out. \return 0 when success, -1 when failure happens