HException::err

HException::err是一个HException类的成员变量，用于存储错误的编号。\[2\]当发生运行错误时，HException的实例将会被创建，并且err成员变量会被赋予相应的错误编号。这个错误编号可以用于识别和处理不同类型的错误。
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