passing a reference to xtor

From: JE (loomis53_at_cox.net)
Date: 09/30/04 

Date: Thu, 30 Sep 2004 09:02:48 -0700

in the code below, I get the error:

In constructor `s::s(std::ifstream&)':
`good' undeclared (first use this function)

I have a feeling this is because I'm passing a reference to a
constructor, but don't understand why. Is it possible to this or
something similar to get the same effect (passing an opened file stream
to a class's constructor)?

#include <iostream>
#include <stdlib.h>

using namespace std;
class s {

public:
     s(ifstream& ifs);

};

s::s(ifstream& ifs) {
     ifs.good();
}

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