将看到一个空白类。
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。
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？
Note that, as expected, the compressed_pair_imp is derived from the empty class.
请注意，正如您所预期的那样，compressed _pair _ imp派生自空类。
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。
Code Sample 2: Empty TriangleType class.
代码示例2：空的triangletype类。
Create an empty OMElement object using a factory class.
用一个工厂类来创建一个空的OMElement对象。
How can you tell whether a class is empty?
您如何知道一个类是否是空的？
If value equals 1, the class is empty; otherwise, you should see 0.
如果值等于1，则该类是空的，否则应该看到0。
In the train, we found an empty third-class carriage.
在列车里，我们找到了一个空的三等车厢。
In the train, we found an empty third-class carriage.
在列车里，我们找到了一个空的三等车厢。
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