The first item in each tuple is a callable object (in this case a method pointer) and the second is a HTTP request type that the method should be called for.

每个元组的第一项是可调用对象（在这里是一个方法指针），第二项是 HTTP 请求类型，这种请求类型可以调用该方法。

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To add an item to the tree, simply call AddItem and give it a pointer to the type of object being stored.

要向这棵树添加一个子项，可以简单的调用AddItem并传一个指针给它，用来存放添加后的对象。

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These events identify the type of the change and contain a pointer to the object that was changed.

这些事件标识了更改的类型，并包含指向所更改对象的指针。

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