// Listing 14.8 passing pointers to functions as function arguments

// using typedef to avoid messy syntax

#include <iostream>
using namespace std;

typedef void (*MATT) (int&, int&);

void square(int &, int &);
void cube(int &, int &);
void swap(int &, int &);
void getVals(int &, int &);
//void printVals(void (*)(int &, int &), int &, int &);			// a little messy
void printVals(MATT, int&, int&);

int main()
{
	int valOne = 1;
	int valTwo = 2;
	int choice = 0;
	bool fQuit = false;

	//void (*pFunc)(int &, int &);
	MATT pFunc;

	while (!fQuit)
	{
		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(pFunc, valOne, valTwo);
	}

	return 0;
}

//void printVals( void (*pFunc)(int &, int &),int &x, int &y)
void printVals(MATT pFunc, int &x, int &y)
{
	cout << "x: " << x << " y: " << y << endl;
	pFunc(x,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;
}