Overloaded operator "<<"

Code:

---

#include <fstream>
using std ofstream;
.
.
.
ofstream &operator<<(ofstream& stream, const Date& d){
        stream << d.getMonth() << '|'  //error found here
                    << d.getDay() << '|'
                    << d.getYear() << '|';

        return stream;
}

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The codes above gave me this error.

Quote:

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e:\jdocument\csci\231\no1\date.cpp(132) : error C2666: '<<' : 13 overloads have similar conversions

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What's weird is when I change all "ofstream" to "ostream" and change to appropriate "include" and "using", it compiles fine.
So, any idea..???

Which compiler do you use?
And how is defined the Date class?

Because, if I try to compile the code below:

Code:

---

#include <fstream>
using std::ofstream;

struct Date {
    int getMonth() const;
    int getDay() const;
    int getYear() const;
};

ofstream &operator <<(ofstream& stream, const Date& d)
{
        stream << d.getMonth() << '|'  //error found here
                    << d.getDay() << '|'
                    << d.getYear() << '|';

        return stream;
}

---

I don't get any error when compiling. But, if I try to use MSVC6, it displays many errors but there are in the STL headers so it's not your fault anyway...

I suspect that the error has got something to do with other parts of my codes, so I guess I have to figure this out myself. Thanks anyway