Static initialization with File and Singleton and framework support.

File和Singleton以及框架支持的静态初始化。

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See the Static Initialization section in the Rationale appendix for more information.

更多信息请见基本原理附录中的静态初始化一节。

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This method should only be called within the static initialization of classes that are adding class handling.

此方法只应当从正在添加类处理的类的静态初始化内部调用。

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