error C2678 error with structure, not object?

Reckoner <>
Mon, 8 Jun 2009 10:01:48 -0700 (PDT)

when I try to compile with MSVC Version 8, I get the following error:

1>C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include
\afxtempl.h(161) : error C2678: binary '==' : no operator found which
takes a left-hand operand of type 'const Taboo' (or there is no
acceptable conversion)
1> C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK
\include\guiddef.h(192): could be 'int operator ==(const GUID &,const
GUID &)'
1> while trying to match the argument list '(const Taboo, const
1> C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include
\afxtempl.h(1170) : see reference to function template instantiation
'BOOL CompareElements<TYPE,Taboo>(const TYPE *,const ARG_TYPE *)'
being compiled
1> with
1> [
1> TYPE=Taboo,
1> ARG_TYPE=Taboo
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include
\afxtempl.h(1155) : while compiling class template member function
1> with
1> [
1> TYPE=Taboo,
1> ARG_TYPE=Taboo &
1> ]
1> h:\letmetype-1.80\AutoType.h(37) : see reference to class
template instantiation 'CList<TYPE,ARG_TYPE>' being compiled
1> with
1> [
1> TYPE=Taboo,
1> ARG_TYPE=Taboo &
1> ]

What's confusing about this is that Taboo is a structure, not an
object. I don't see why it's complaining that it can't find a '=='
operator when Taboo is not even an object.

The source code follows below:
// AutoType.h : main header file for LetMeType
// $Id: AutoType.h,v 1.2 2002/06/04 19:55:26 cc Exp $

#ifndef __AUTOTYPE_H__
#define __AUTOTYPE_H__

#ifndef __AFXWIN_H__
    #error include 'stdafx.h' before including this file for PCH

#include "resource.h" // main symbols
#include <fstream.h>
#include "hook.h"

typedef DWORD (WINAPI *GetModuleFileNameExProc)(HANDLE, HMODULE,

const short MAX_WORD_LEN = 40;
const short DB_MAXSIZE_UNREG = 100;
const short DB_MAXSIZE = 20000;
const short DB_MAXAGE_UNREG = 14;
const short DB_MAXAGE = 720;

class CSuggestionsDlg;

struct Taboo
    WORD hash;
    CString description;
BOOL AFXAPI CompareElements(const Taboo* p1, const Taboo* p2);

#include <afxtempl.h>

class CTabooList : public CList<Taboo, Taboo&>
    void operator=(const CTabooList&);
    POSITION Find(UINT searchValue, POSITION startAfter = NULL) const;

// CAutoTypeApp

class CAutoTypeApp : public CWinApp

// Overrides
    // ClassWizard generated virtual function overrides
    virtual BOOL InitApplication();
    virtual BOOL InitInstance();
    virtual int ExitInstance();

// Implementation

    afx_msg void OnAppAbout();
    afx_msg void OnOptionsSuggest();
    afx_msg void OnFileSettings();
    afx_msg void OnOptionsPasswords();
    afx_msg void OnFileChars();
    afx_msg void OnHelpHelp();
    afx_msg void OnOptionsCountkeys();
    afx_msg void OnOptionsBackColor();
    afx_msg void OnOptionsFont();
    afx_msg void OnOptionsClipboard();
    afx_msg void OnOptionsLearn();
    afx_msg void OnOptionsApplications();


    bool FirstInstance();
    void SaveWndPlace();
    void EmptyMsgBuffer();
    bool GetNextMessage(MsgData &msg);
    virtual BOOL OnIdle(LONG lCount);
    void IncrTypedSelf();
    void IncrTypedAuto(short delta);
    int GetWindowModuleFileName(HWND hwnd, LPTSTR lpszFileName, UINT

    CSuggestionsDlg* m_dlgSuggestions;

    PMappedMsgFile msgFile;
    HANDLE hMutexObject;
    char namePrefix[20];

    DWORD wmCharCount; // total count of received WM_CHAR messages
    DWORD autoTypeCount; // count of suggested and transmitted chars
    CTabooList taboos; // words to be ignored by AutoType

    HINSTANCE hmodHook; // handle of HOOK dll
    HANDLE hMapObject;
    bool m_bSuggest, m_bLearn;
    bool m_bCountKeys;
    CString language;
    short typingDelay;
    bool m_bModalDlg;

    COLORREF foreColor, backColor; // colors for suggestion window
    CString fontName;
    int fontSize;

    bool m_bMonitorClipboard, ignoreClipboard;
    HWND nextClipboardViewer;

    OSVERSIONINFO m_osVersion;
    GetModuleFileNameExProc pGetModuleFileNameEx;

    // Applications to which suggestions should be limited.
    bool m_bPositiveApplications;
    bool m_bNegativeApplications;
    CStringArray m_positiveApplications;
    CStringArray m_negativeApplications;

extern CAutoTypeApp theApp;


any help appreciated.

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