基类的第三个元素用于选择要使用哪种具体的模板特殊化。
The third element of the base class is used to choose which specific template specialization to use. The value for the third element is provided by
最后，模板特殊化的版本如 清单 21 中所示。
Finally, the template specialized version is shown in Listing 21.
事实证明，模板局部特殊化方面的知识特别有价值。
In particular, knowledge of template partial specialization prove invaluable.
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