Re: Member Functions

From: Vince Morgan (vinharUNSPAM_at_optusnetUNSPAM.com.au)
Date: 03/28/05 

Date: Mon, 28 Mar 2005 16:44:57 +1000

Hi All,
            It is at grave risk to my dignity that I ask the following,
so please be kind : )
 I know that classes\struct have their data members
grouped together in memory, however my question relates
to their member functions.
If I create code as follows I know that I can have a number
of instances of struct S and that each instance of this struct
will have a pointer to a single function.
If I were to implement this as a class with a member function
instead of the function pointer, would that member function
exist in a similar fashion, or would the function code be
replicated in every instance of the class?

#include <iostream>
#include <ostream>

int Func(int i)
{
 return i + 42;
}

struct S
{
 int a;
 int (*pFunc) (int);
 S(): pFunc(&Func), a(0) {}
};

int main()
{
 S s[10];
 s[0].a = 3;
 int b = s[0].pFunc(s[0].a);
 cout << b << endl;

 return 0;
}

TIA
Vince Morgan

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