Question

Possible Duplicate:
What is an undefined reference/unresolved external symbol error and how do I fix it?

I somehow get this error. This is my code:

#ifndef BASESTATION_H_
#define BASESTATION_H_

#include <list>
#include "Song.h"
#include <string>

using mtm::Song;
using std::list;
namespace stations {

class baseStation {
public:
    explicit baseStation(double frequency) : frequency(frequency) {}
    double getFrequency() const;
    bool getIsFullVersion() const;
    bool isInPlaylist(const string& author, const string& name) const;
    virtual void addSong(const Song& song);
    virtual const Song& getCurrentSong() const;
    virtual const SongPart& getCurrentlyPlayedPart(unsigned int time) const;
    virtual ~baseStation();

private:
    //keep it protected or not??
    double frequency;
    list<Song> playlist;
    list<Song>::iterator currentSong;
    bool isFullVersion;
};

and the error I get is: undefined reference to `vtable for stations::baseStation’ on the “explicit” line.

Thanks a lot.`

Answer 1

The code you’ve posted here is fine. I can compile it without issues by defining my own Song and SongPart classes (I have to since they are defined in Song.h).

I’m assuming your “Song.h” is doing something unusual.