这些函式解决两个最棘手的记忆体配置问题：覆写配置之缓冲区的尾端和记忆体遗漏 （无法成功释放不再需要的配置）。

These functions solve two of the most difficult memory allocation problems: overwriting the end of an allocated buffer and memory leaks (failing to free allocations after they are no longer needed).

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衍生类别中的函式试图覆写基底类别中的虚拟函式，但衍生类别函式没有与基底类别函式相同的传回型别。

A function in a derived class attempted to override a virtual function in a base class, but the derived class function did not have the same return type as the base class function.

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这可防止其他类别藉著覆写重要函式来变更类别的行为。

This prevents other classes from changing the behavior of the class by overriding important functions.

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