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1.基类2.constthrow()stackoverflow：constmeansthatthisfunction(whichisamemberfunction)willnotchangetheobservablestateoftheobjectitiscalledon.Thecompilerenforcesthisbyn...
1. 基类 2.const throw() stackoverflow： const means that this function (which is a member function) will not change the observable state of the object it is called on. The compiler enforces this by n