error LNK2019: unresolved external symbol

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Dear Sir,
Follows are my codes:

XML

#pragma once

// Disable warnings about long names
#ifdef WIN32
  #pragma warning( disable : 4786)
#endif

#include <map>

using namespace std;

template <typename _Ty> class IMagicMap
{
public:
    _Ty m_BaseMap;

    virtual bool Add(_Ty& NewObject, LPCTSTR lpszKeyName = NULL) = 0;
    virtual bool Remove(LPCTSTR lpszKeyName) = 0;
    virtual bool Find(LPCTSTR lpszKeyName, _Ty& Found) = 0;

protected:
    virtual ~IMagicMap(){}
};

template <typename _Ty> class CMagicMap : public IMagicMap<_Ty>
{
public:
    CMagicMap();
    virtual ~CMagicMap();

    map<CString, _Ty> m_BaseMaps;
    typename map<CString, _Ty>::const_iterator m_itBaseMap;

    bool Add(_Ty& NewObject, LPCTSTR lpszKeyName = NULL);
    bool Remove(LPCTSTR lpszKeyName);
    bool Find(LPCTSTR lpszKeyName, _Ty& Found);
};

XML

#include "StdAfx.h"
#include "MagicMap.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

template <typename _Ty>
CMagicMap<_Ty>::CMagicMap()
{

};

template <typename _Ty>
CMagicMap<_Ty>::~CMagicMap()
{
    // Garbage collector
    for (m_itBaseMap = m_BaseMaps.begin(); m_itBaseMap != m_BaseMaps.end();)
    {
        m_BaseMaps.erase(m_itBaseMap++);
    }
}

template <typename _Ty>
bool CMagicMap<_Ty>::Add(_Ty& NewObject, LPCTSTR lpszKeyName/* = NULL*/)
{
    m_BaseMap = NewObject;
    CString strKeyName = _T("");

    if (NULL != lpszKeyName)
       strKeyName = lpszKeyName;
    else
       strKeyName = NewObj.GetChannelName();

    if ( strKeyName.IsEmpty() )
       return false;

    m_BaseMaps[strKeyName] = NewObject;

    return true;
}

template <typename _Ty>
bool CMagicMap<_Ty>::Remove(LPCTSTR lpszKeyName)
{
    if (NULL == lpszKeyName)
       return false;

    bool bRes;

    int nResult = m_BaseMaps.erase( lpszKeyName );

    if ( nResult != 0 )
       bRes = true;
    else
       bRes = false;

    return bRes;
}

template <typename _Ty>
bool CMagicMap<_Ty>::Find(LPCTSTR lpszKeyName, _Ty& Found)
{
    if ( (NULL == lpszKeyName) )
       return false;

    bool bRet;
    m_itBaseMap = m_BaseMaps.find(lpszKeyName);

    if ( m_itBaseMap != m_BaseMaps.end() )
    {
       Found = m_itBaseMap->second;
       bRet = true;
    }
    else
       bRet = false;

    return bRet;
}

XML

#pragma once

#include "MagicMap.h"
#include "Annotation.h"
#include "ColorBar.h"
#include "GridLine.h"
#include "Logo.h"
#include "MapInfo.h"

class CBaseMaps
{
public:
    CBaseMaps();
    CBaseMaps(const CBaseMaps& rhs);
    virtual ~CBaseMaps();

    const CMagicMap<CAnnotation>& Annotations() const;
    const CMagicMap<CColorBar>& ColorBars() const;
    const CMagicMap<CGridLine>& GridLines() const;
    const CMagicMap<CLogo>& Logos() const;
    const CMagicMap<CMapInfo>& MapInfos() const;

    void Annotations(CMagicMap<CAnnotation>& bmAnnotations);
    void ColorBars(CMagicMap<CColorBar>& bmColorBars);
    void GridLines(CMagicMap<CGridLine>& bmGridLines);
    void Logos(CMagicMap<CLogo>& bmLogos);
    void MapInfos(CMagicMap<CMapInfo>& bmMapInfos);

// Operators
    const CBaseMaps & operator = (const CBaseMaps& rhs);
    bool operator<( const CBaseMaps& BaseMaps ) const;

protected:
// Attributes
    CMagicMap<CAnnotation> m_bmAnnotations;
    CMagicMap<CColorBar>   m_bmColorBars;
    CMagicMap<CGridLine>   m_bmGridLines;
    CMagicMap<CLogo>       m_bmLogos;
    CMagicMap<CMapInfo>    m_bmMapInfos;
};

#include "StdAfx.h"
#include "BaseMaps.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CBaseMaps::CBaseMaps()
{

}

CBaseMaps::CBaseMaps( const CBaseMaps &rhs )
{
    this->m_bmAnnotations = rhs.m_bmAnnotations;
    this->m_bmColorBars   = rhs.m_bmColorBars;
    this->m_bmGridLines   = rhs.m_bmGridLines;
    this->m_bmLogos       = rhs.m_bmLogos;
    this->m_bmMapInfos    = rhs.m_bmMapInfos;
};

CBaseMaps::~CBaseMaps()
{

}

const CBaseMaps& CBaseMaps::operator = (const CBaseMaps& rhs)
{
    if (&rhs != this)
    {
       this->m_bmAnnotations = rhs.m_bmAnnotations;
       this->m_bmColorBars   = rhs.m_bmColorBars;
       this->m_bmGridLines   = rhs.m_bmGridLines;
       this->m_bmLogos       = rhs.m_bmLogos;
       this->m_bmMapInfos    = rhs.m_bmMapInfos;
    }

    return (*this);
}

bool CBaseMaps::operator<( const CBaseMaps& BaseMaps ) const
{
    return true;
};

const CMagicMap<CAnnotation>& CBaseMaps::Annotations() const
{
    return m_bmAnnotations;
}

const CMagicMap<CColorBar>& CBaseMaps::ColorBars() const
{
    return m_bmColorBars;
}

const CMagicMap<CGridLine>& CBaseMaps::GridLines() const
{
    return m_bmGridLines;
}

const CMagicMap<CLogo>& CBaseMaps::Logos() const
{
    return m_bmLogos;
}

const CMagicMap<CMapInfo>& CBaseMaps::MapInfos() const
{
    return m_bmMapInfos;
}

void CBaseMaps::Annotations(CMagicMap<CAnnotation>& bmAnnotations)
{
    m_bmAnnotations = bmAnnotations;
}

void CBaseMaps::ColorBars(CMagicMap<CColorBar>& bmColorBars)
{
    m_bmColorBars = bmColorBars;
}

void CBaseMaps::GridLines(CMagicMap<CGridLine>& bmGridLines)
{
    m_bmGridLines = bmGridLines;
}

void CBaseMaps::Logos(CMagicMap<CLogo>& bmLogos)
{
    m_bmLogos = bmLogos;
}

void CBaseMaps::MapInfos(CMagicMap<CMapInfo>& bmMapInfos)
{
    m_bmMapInfos = bmMapInfos;
}

When linking with VS2008, the linker throwed the following error to me:

Compiling...
1>BaseMaps.cpp
1>Linking...
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CMagicMap<class CLogo>::~CMagicMap<class CLogo>(void)" (??1?$CMagicMap@VCLogo@@@@UAE@XZ) referenced in function __unwindfunclet$??0CBaseMaps@@QAE@XZ$0
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CMagicMap<class CGridLine>::~CMagicMap<class CGridLine>(void)" (??1?$CMagicMap@VCGridLine@@@@UAE@XZ) referenced in function __unwindfunclet$??0CBaseMaps@@QAE@XZ$0
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CMagicMap<class CColorBar>::~CMagicMap<class CColorBar>(void)" (??1?$CMagicMap@VCColorBar@@@@UAE@XZ) referenced in function __unwindfunclet$??0CBaseMaps@@QAE@XZ$0
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CMagicMap<class CAnnotation>::~CMagicMap<class CAnnotation>(void)" (??1?$CMagicMap@VCAnnotation@@@@UAE@XZ) referenced in function __unwindfunclet$??0CBaseMaps@@QAE@XZ$0
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: __thiscall CMagicMap<class CMapInfo>::CMagicMap<class CMapInfo>(void)" (??0?$CMagicMap@VCMapInfo@@@@QAE@XZ) referenced in function "public: __thiscall CBaseMaps::CBaseMaps(void)" (??0CBaseMaps@@QAE@XZ)
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: __thiscall CMagicMap<class CLogo>::CMagicMap<class CLogo>(void)" (??0?$CMagicMap@VCLogo@@@@QAE@XZ) referenced in function "public: __thiscall CBaseMaps::CBaseMaps(void)" (??0CBaseMaps@@QAE@XZ)
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: __thiscall CMagicMap<class CGridLine>::CMagicMap<class CGridLine>(void)" (??0?$CMagicMap@VCGridLine@@@@QAE@XZ) referenced in function "public: __thiscall CBaseMaps::CBaseMaps(void)" (??0CBaseMaps@@QAE@XZ)
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: __thiscall CMagicMap<class CColorBar>::CMagicMap<class CColorBar>(void)" (??0?$CMagicMap@VCColorBar@@@@QAE@XZ) referenced in function "public: __thiscall CBaseMaps::CBaseMaps(void)" (??0CBaseMaps@@QAE@XZ)
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: __thiscall CMagicMap<class CAnnotation>::CMagicMap<class CAnnotation>(void)" (??0?$CMagicMap@VCAnnotation@@@@QAE@XZ) referenced in function "public: __thiscall CBaseMaps::CBaseMaps(void)" (??0CBaseMaps@@QAE@XZ)
1>BaseMaps.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CMagicMap<class CMapInfo>::~CMagicMap<class CMapInfo>(void)" (??1?$CMagicMap@VCMapInfo@@@@UAE@XZ) referenced in function __unwindfunclet$??0CBaseMaps@@QAE@ABV0@@Z$0
1>D:\SetTest\Debug\SetTest.exe : fatal error LNK1120: 10 unresolved externals
1>Build log was saved at "file://d:\SetTest\SetTest\Debug\BuildLog.htm"
1>SetTest - 11 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Could you help me to resolve these "unresolved externals" problems.

Thank you very much!

Golden Lee

Posted 21-Dec-10 15:12pm

Golden Lee

Updated 22-Dec-10 1:54am

Richard MacCutchan

v3

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Comments

ShilpiP 22-Dec-10 0:44am

Please specify which symbol is unresolved or update question with error message that you receive.

Richard MacCutchan 22-Dec-10 7:51am

Edited so the diagnostic information is visible; I do wish people would review their posted questions rather than just pressing submit and assuming it's readable!

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KingsGambit · Accepted Answer · 2010-12-21T18:15:00

Solution 1

Template declarations and definitions should be in the header file. We cannot split it between .h and .cpp files. You can check if that is the issue.

Posted 21-Dec-10 18:15pm

KingsGambit

Comments

Emilio Garavaglia 22-Dec-10 8:31am

Dear Rejeesh.T.S
I merge the template declarations and definitions into the header file. My program passed VS2008 linking. But VS 6.0 can link the splitted one with no errors. I don't why.

Thank you very much!

Golden Lee

(edited by ...)