Returning value from C++ into Obj-C?

I'm banging my head for a while with how to return a value from some C++ into Obj-C. Here are my files:

XMLParsing.h

#include <iostream>
#include <libxml/xmlreader.h>
#include <string>
#include <stdlib.h>

using namespace std;

class XMLParsing {
    int i;

public:
    int outputAnArray();
};

XMLParsing.cpp

#include "XMLParsing.h"      

int outputAnArray() {

    return 1;
}

MyTest.mm

XMLParsing *parser = new XMLPar开发者_如何学Csing();
parser->outputAnArray();

This raises: Undefined symbols for architecture i386: ld: symbol(s) not found for architecture i386

Any hint would be greatly appreciated.

---

The XMLParsing.cpp should be like:

#include "XMLParsing.h"

int XMLParsing::outputAnArray() {

 return 1;
}

Sorry for the late answer.