c++ - 本地抽象类的纯虚拟析构函数

Question

考虑以下代码:

struct  A {
    virtual void foo() {}
    virtual ~A() = 0;
};
struct B :public A
{
    virtual void foo() {};
};
A::~A() {}; 
int main()
{
    A * a = new B();
    a->foo();
}

它工作得很好。但现在考虑第二个代码，我们需要在一个函数内本地声明我们的类:

void foo()
{
    struct  A {
        virtual void foo() {}
        virtual ~A() = 0;
    };
    struct B :public A
    {
        virtual void foo() {};
    };
    A::~A() {}; //error C2352 : 'A::~A' : illegal call of non - static member function

    A * a = new B();
    a->foo();
}
int main()
{
    foo();  
}

代码无法编译!任何的想法？有什么方法可以重新定义在本地声明的基类的纯虚拟析构函数？

Answer 1

cppreference说

A class declaration can appear (...) and inside the body of a function, in which case it defines a local class

...

Member functions of a local class have to be defined entirely inside the class body