has no out-of-line virtual method definitions； its vtable will be emitted in every translation unit

'BaseXml'  has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit 定義了一個基類，出現了上面的警告，具體的類定義如下： 經過搜索發現原因如下： If a class is defined in a header file and has a v

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