c – 自动调用原始指针的自定义转换器A * < - > B *

简而言之,我希望程序使用我的自定义函数将A *转换为B *,反之亦然.
我希望它能自动完成,以方便我.

class Manager{
    void fb(B* b){ /** something complex       */ }
    void fa(A* a){ /** different thing complex */ }
    void testCase(){
        A* a=   ... ;  
        fa(a);  
        fb(a);  //automatic convert to B* using "converter2" (wish)
        B* b=   ... ;
        fa(b);  //automatic convert to A* using "converter1" (wish)
        fb(b);
    }
    template<class T> T* converter1(B* b){  //hardcoded,non-static.
        return this->getId<T>(b);   
        //^^^ just an example to show how custom it is,//    currently T=A
    }
    B* converter2(A* a){  //hardcoded
        return a->getB();   
        //^^^ just an example to show how custom it is.
    }
}

真实情况有很多A – A1,A2,A3等.
A和B不是相互派生的.

我希望有办法.我想到指针的构造函数.