Member pointer

Question

How to Use pointers to members to refer to nonstatic members of class objects?

Solution

// MemberFunc.cpp : Defines the entry point for the console application.

//

#include <iostream>

using namespace std;

class Fred {

public:

int f(int x, int y){ return x + y;}

int g(int x, int y){ return x - y;}

int h(int x, int y){ return x * y;}

int i(int x, int y){ return x / y;}

int val;

};

typedef int (Fred::*FredMemFn)(int x, int y);

typedef int Fred::*FredMemPtr;

int main()

{

Fred fred;

FredMemFn p[] = {

&Fred::f,

&Fred::g,

&Fred::h,

&Fred::I

};

for(int i = 0; i < sizeof(p) / sizeof(p[0]); ++i){

cout << (fred.*p[i])(10, 12) << endl;

}

FredMemPtr v = &Fred::val;

fred.*v = 10;

cout << fred.val << endl;

return 0;

}

Output

22

-2

120

0

10

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