Cpp - Arrays of Pointers to Member Functions

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Introduction

Pointers to member functions can be stored in an array.

The array can be initialized with the addresses of various member functions, and those can be invoked by offsets into the array.

Demo

#include <iostream> 
 
class Dog //from   w w w .  j a  v  a 2 s  . c  o  m
{ 
public: 
    void speak() const { std::cout << "Woof!\n"; } 
    void move() const { std::cout << "Walking to heel ...\n"; } 
    void eat() const { std::cout << "Gobbling food ...\n"; } 
    void growl() const { std::cout << "Grrrrr\n"; } 
    void whimper() const { std::cout << "Whining noises ...\n"; } 
    void rollOver() const { std::cout << "Rolling over ...\n"; } 
    void playDead() const 
           { std::cout << "Is this the end of Little Caesar?\n"; } 
}; 
 
typedef void (Dog::*PDF)() const; 
 
int main() 
{ 
    const int maxFuncs = 7; 
    PDF dogFunctions[maxFuncs] = 
           {   &Dog::speak, 
               &Dog::move, 
               &Dog::eat, 
               &Dog::growl, 
               &Dog::whimper, 
               &Dog::rollOver, 
               &Dog::playDead 
        }; 
 
    Dog* pDog =0; 
    int method; 
    bool fQuit = false; 
 
    while (!fQuit) 
    { 
          std::cout << "(0) Quit (1) Speak (2) Move (3) Eat (4) Growl\n"; 
          std::cout << "(5) Whimper (6) Roll Over (7) Play Dead: "; 
          std::cin >> method; 
          if (method == 0) 
           { 
               fQuit = true; 
               break; 
           } 
          else 
           { 
               pDog = new Dog; 
               (pDog->*dogFunctions[method - 1])(); 
               delete pDog; 
           } 
          std::cout << std::endl; 
    } 
    return 0; 
}

Result

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