从基类中调用派生类的隐藏(非虚拟)方法 [英] Call hidden (non virtual) method of derived class from base

问题描述

是否有一种方法(模板，宏，其他任何方法)可以替代在 编译时从 common 方法对 hidden_​​in_derived 的调用，因此Derived实例会调用它自己的 hidden_​​in_derived ( 无 使Base中的 hidden_​​in_derived 虚拟) ?

Is there a way (templates, macros anything else) to substitute a call to hidden_in_derived from common method at compile time, so that instance of Derived calls it's own hidden_in_derived (without making hidden_in_derived virtual in Base) ?

#include <iostream>

class Base {
public:
    void common() {
        // some calls to other methods
        hidden_in_derived();
        // yet some calls to other methods
    }

    void hidden_in_derived() {
        std::cout << "A" << std::endl;
    }
};

class Derived : public Base {
public:
    void hidden_in_derived() {
        std::cout << "B" << std::endl;
    }
};


int main() {
    Derived d;
    d.common(); // want hidden_in_derived (prints "B") here somehow ?

}

推荐答案

将其设为虚拟，您甚至可以使用基类ptr:

Make it virtual, then you can even use Base class ptr: https://wandbox.org/permlink/tF5Cb4fE5jEhG5Ru

或者就像您对一个对象所做的那样: https://wandbox.org/permlink/W2EJGXwioXjqd1Zx

Or just like you did with an object: https://wandbox.org/permlink/W2EJGXwioXjqd1Zx

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