Mega Code Archive
Use typedef to define a function type for function pointer
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#include <iostream>
using namespace std;
void Square (int&,int&);
void Cube (int&, int&);
void Swap (int&, int &);
void GetVals(int&, int&);
typedef void (*VPF) (int&, int&) ;
void PrintVals(VPF,int&, int&);
int main()
{
int valOne=1, valTwo=2;
VPF pFunc;
pFunc = GetVals;
pFunc = Square;
pFunc = Cube;
pFunc = Swap;
PrintVals ( pFunc, valOne, valTwo);
return 0;
}
void PrintVals( VPF 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;
}
x: 1 y: 2
x: 2 y: 1
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