4elist1511.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

//Listing 15.11 Array of pointers to member functions

#include <iostream>
using std::cout;

class Dog
{
public:
	void Speak()const { cout << "Woof!\n"; }
	void Move() const { cout << "Walking to heel...\n"; }
	void Eat() const { cout << "Gobbling food...\n"; }
	void Growl() const { cout << "Grrrrr\n"; }
	void Whimper() const { cout << "Whining noises...\n"; }
	void RollOver() const { cout << "Rolling over...\n"; }
	void PlayDead() const { cout << "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)
	{
		cout << "(0)Quit (1)Speak (2)Move (3)Eat (4)Growl";
		cout << " (5)Whimper (6)Roll Over (7)Play Dead: ";
		std::cin >> Method;
		if (Method == 0)
		{
			fQuit = true;
		}
		else
		{
			pDog = new Dog;
			(pDog->*DogFunctions[Method-1])();
			delete pDog;
		}
	}
	return 0;
}