基类的析构函数声明为虚函数

基类的析构函数声明为虚函数是必要的。当基类指针指向派生类的对象时，如果删除该指针，只有将基类的析构函数声明为虚函数，才能保证同时调用派生类的析构函数和基类的析构函数，从而正确释放整个派生类对象。如果基类的析构函数不声明为虚函数，则在删除基类指针时，只会调用基类的析构函数而不调用派生类的析构函数，导致派生类对象析构不完全，从而可能造成内存泄漏。因此，为了实现多态性并防止内存泄漏，将基类的析构函数声明为虚函数是十分必要的。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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