This returns a new empty class to which I can add attributes.

它返回一个新的空类，我能向此空类添加属性。

youdao

The compiler still has to allocate space for the empty class, right?

编译器仍然必须为空类分配空间，对吧？

youdao

Note that when the first element is an empty class, compressed_pair_imp returns *this.

请注意，当第一个元素为空类时，compressed_pair_imp返回 *this。

youdao

Note that when the first element is an empty class, compressed_pair_imp returns *this.

请注意，当第一个元素为空类时，compressed_pair_imp返回 *this。

youdao