example of using std::map to store string keys and values that are bound member functions with 1 parameters

classWithMapFunctions.cpp

#ifndef human_hpp
#define human_hpp

#include <stdio.h>
#include <iostream>
#include <string>
#include <random>
#include <functional>
#include <map>
using namespace std::placeholders;

class human {
    
public:
    human(const std::string& _state, int _id) : id(_id), state(_state) {
        std::cout << "human: " << id << " state: " << state << " being born at " << this << "\n";
        memberFuns["S"] = std::bind(&human::S,this,_1);
        memberFuns["I"] = std::bind(&human::I,this,_1);
        memberFuns["R"] = std::bind(&human::R,this,_1);
        rng.seed(std::random_device()());
    };
    ~human(){
        std::cout << "human: " << id << " state: " << state << " being killed at " << this << "\n";
    };
    void oneStep(){
        /* sample a state */
        std::uniform_int_distribution<int> rint(0,2);
        int sample = rint(rng);
        std::cout << "sample : " << sample << "\n";
        if(sample==0){state = "S";}
        if(sample==1){state = "I";}
        if(sample==2){state = "R";}
        /* dispatch via function pointers */
        memberFuns.at(state)(sample);
    };

private:
    int id;
    std::string state;
    std::map<std::string,std::function<void(int)> > memberFuns;
    std::mt19937_64 rng;
    
    void S(int num){
        std::cout << "human: " << id << " state: " << state << " calling S!\n";
    };
    void I(int num){
        std::cout << "human: " << id << " state: " << state << " calling I!\n";
    };
    void R(int num){
        std::cout << "human: " << id << " state: " << state << " calling R!\n";
    };
};

#endif /* human_hpp */

/* main */
#include "human.hpp"

int main(){
    std::cout << "staring tests ... \n";
    
    human* person = new human("S",1);
    for(size_t i=0; i<10; i++){
        person->oneStep();
    }
    delete person;
};