为什么这给了我"对构造函数和析构函数的未定义引用"？

Question

我有以下几段代码:

Leomedia.h

#include "MusicMetaDatter.h"

#ifndef LEOMEDIA_H
#define LEOMEDIA_H

namespace Leomedia
{
    typedef enum
    {
        read,
        write
    } FileMode;
}

#endif // LEOMEDIA_H

MusicMetaDatter.h

#ifndef MUSICMETADATTER_H
#define MUSICMETADATTER_H

#include "Leomedia.h"
#include <string>

/**
* METADATTER
* @Version 1.0.0a
* @Author: Sergio Andrés Ibañez (Leonnears)
* @Twitter: Leonnears
* @Package: Leomedia
*/

    namespace Leomedia
    {
        typedef enum
        {
            mp3,
            m4a,
            flac,
            ape,
            wavPack,
            aiff,
            wav,
            ogg,
            tta
        } AudioFileType;

        class MusicMetaDatter
        {
            public:
                MusicMetaDatter(std::string fileName, AudioFileType type, FileMode mode);
                virtual ~MusicMetaDatter();

            private:
                std::string md_fileName;
                AudioFileType md_fileType;
                FileMode md_fileMode;
        };
    }

    #endif // MUSICMETADATTER_H

MusicMetaDatter.cpp

#include "MusicMetaDatter.h"
#include <string>

Leomedia::MusicMetaDatter::MusicMetaDatter(std::string fileName, AudioFileType type, FileMode mode)
{
    this -> md_fileName = fileName;
    this -> md_fileType = type;
    this -> md_fileMode = mode;
}

Leomedia::MusicMetaDatter::~MusicMetaDatter()
{
    //dtor
}

MetaDatterTest.cpp

#include <iostream>
#include "Leomedia.h"
#include <string>
using namespace std;

int main()
{
    Leomedia::MusicMetaDatter meta("troll", Leomedia::mp3, Leomedia::read);
    return 0;
}

当我编译MetaDatterTest时,我收到以下错误:

未定义引用Leomedia :: MusicMetaDatter :: MusicMetaDatter(std :: string,Leomedia :: AudioFileType,Leomedia :: FileMode)'未定义引用Leomedia :: MusicMetaDatter :: ~MusicMetaDatter()'未定义引用Leomedia :: MusicMetaDatter :: 〜MusicMetaDatter()"

所有文件都在同一目录中.我正在使用mingw 4.4.1

有人可以帮我弄这个吗？它使我无法理解.

Answer 1

你没有给出你的编译命令,但我怀疑它没有MusicMetaDatter.cpp.

应该是这样的

g++ -o MetaDatterTest MetaDatterTest.cpp MusicMetaDatter.cpp