Function sqlite3_sys::sqlite3_create_function

pub unsafe extern fn sqlite3_create_function(p: *mut sqlite3,
                                             p: *const c_char,
                                             n: c_int,
                                             n: c_int,
                                             p: *mut c_void,
                                             f: Option<sqlite3_create_function_callback1>,
                                             f: Option<sqlite3_create_function_callback1>,
                                             f: Option<sqlite3_create_function_callback2>)
                                             -> c_int