[C++] 함수포인터(간단한 예제)

// Listing 15.5 Using function pointers

#include <iostream>
using namespace std;

void Square (int&,int&);
void Cube (int&, int&);
void Swap (int&, int &);
void GetVals(int&, int&);
void PrintVals(int, int);

int main()
{
        void (* pFunc) (int &, int &);
        bool fQuit = false;

        int valOne=1, valTwo=2;
        int choice;
        while (fQuit == false)
        {
                cout << "(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: ";
                cin >> choice;
                switch (choice)
                {
                case 1: pFunc = GetVals; break;
                case 2: pFunc = Square; break;
                case 3: pFunc = Cube; break;
                case 4: pFunc = Swap; break;
                default : fQuit = true; break;
                }

                if (fQuit)
                        break;

                PrintVals(valOne, valTwo);
                pFunc(valOne, valTwo);
                PrintVals(valOne, valTwo);
        }
        return 0;
}

void PrintVals(int x, int y)
{
        cout << "x: " << x << " y: " << y << endl;
}

void Square (int & rX, int & rY)
{
        rX *= rX;
        rY *= rY;
}

void Cube (int & rX, int & rY)
{
        int tmp;

        tmp = rX;
        rX *= rX;
        rX = rX * tmp;

        tmp = rY;
        rY *= rY;
        rY = rY * tmp;
}

void Swap(int & rX, int & rY)
{
        int temp;
        temp = rX;
        rX = rY;
        rY = temp;
}

void GetVals (int & rValOne, int & rValTwo)
{
        cout << "New value for ValOne: ";
        cin >> rValOne;
        cout << "New value for ValTwo: ";
        cin >> rValTwo;
}



(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 1
x: 1 y: 2
New value for ValOne: 2
New value for ValTwo: 3
x: 2 y: 3
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 3
x: 2 y: 3
x: 8 y: 27
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 2
x: 8 y: 27
x: 64 y: 729
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 4
x: 64 y: 729
x: 729 y: 64
(0)Quit (1)Change Values (2)Square (3)Cube (4)Swap: 0