小编Mat*_*rie的帖子

我想在C++上创建一个很好的接口,每个实现都需要在其上定义添加.

我想做这样的事情:

    class A{
        ...
        virtual A& operator+(const A& other) =0;
        ...
    }
    // this is my interface or abstract class.


    class B : A{
        ...
        B& operator+(const B& other);
        ...
    }
    // this is the kind of implementation i would like. a B element can be added by another B element only ! At least this the constraint I am aiming at.

因为c ++不接受逆变,我的功能B& operator+(const B& other)没有实现virtual A& operator+(const A& other).有没有什么棘手的(但有点干净......)方法呢？