std::map of member function pointers?

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 4  2023

悲&欢浪女 2020-12-03 01:14

I need to implement an std::map with pairs. The function pointers are pointers to methods of the same class that owns t

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南方客 (楼主)

2020-12-03 01:48

This is about the simplest I can come up with. Note no error checking, and the map could probably usefully be made static.

#include 
#include 
#include 
using namespace std;

struct A {
    typedef int (A::*MFP)(int);
    std::map  fmap;

    int f( int x ) { return x + 1; }
    int g( int x ) { return x + 2; }


    A() {
        fmap.insert( std::make_pair( "f", &A::f ));
        fmap.insert( std::make_pair( "g", &A::g ));
    }

    int Call( const string & s, int x ) {
        MFP fp = fmap[s];
        return (this->*fp)(x);
    }
};

int main() {
    A a;
    cout << a.Call( "f", 0 ) << endl;
    cout << a.Call( "g", 0 ) << endl;
}

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