The root class of an inheritance hierarchy should define a virtual destructor even if the destructor has no work to do.
继承层次关系的根类应该定义虚函数性质的析构函数,即使这个析构函数不做任何的事情。
The root class of an inheritance hierarchy should define a virtual destructor even if the destructor has no work to do.
继承层次关系的根类应该定义虚函数性质的析构函数,即使这个析构函数不做任何的事情。
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