C++ map of “events” and member function pointers

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礼貌的吻别 2021-01-26 07:03

I\'ve managed to write a template class to work like a callback, learned from the accepted answer of this question How to define a general member function pointer.

I wis

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臣服心动 (楼主)

2021-01-26 07:15

There's no need for inheritance here. Just use std::function to store the member function pointers and std::bind to bind together the member function pointer and the object instance.

#include 
#include 
#include 
#include 

struct Apple {
    void Red () {
        std::cout << "aa\n";
    }
};

struct Orange {
    void Blue () {
        std::cout << "bb\n";
    }
};

int main()
{
    std::map> m;
    Apple a;
    Orange o;

    m["apple"] = std::bind(&Apple::Red, a);
    m["orange"] = std::bind(&Orange::Blue, o);

    m["apple"]();
    m["orange"]();
}

Output:

aa
bb

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