void代码的作用

[xueyoo]

int yang_thread_join(yang_thread_t thread, void** value_ptr) {
(void)value_ptr;
return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
CloseHandle(thread) == 0);
}

(void)value_ptr; //这句代码是否没有起什么作用？