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在 final 类中不应声明虚函数

6.8.13 ID_virtualInFinal
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final 类不再产生派生类,其中的虚函数也不会再被重写,故不应声明虚函数。

示例:

class A final {
public:
    virtual int foo();  // Non-compliant, a new virtual function in a final class
};

class B {
public:
    virtual int bar();
};

class C final: public B {
public:
    virtual int bar();  // Non-compliant, use keyword ‘override’ or ‘final’
};

依据

ISO/IEC 14882:2011 9(3) ISO/IEC 14882:2017 12(3)
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