A. メンバー関数の定義にstaticを付ける

staticにすればよいが...

[リスト10-2] :

class MYCLASS {
public:
    static LRESULT CALLBACK WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam );
    static VOID CALLBACK TimerProc( HWND hwnd, UINT message, UINT id, DWORD dwTime );
    static BOOL CALLBACK DialogProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam );
    ~~~~~~←ここにstaticを付けるだけでいい
};

MYCLASS     myclass;

void Func( void ) {
    WNDCLASS    wc;
    wc.style        = CS_HREDRAW | CS_VREDRAW ;
    wc.lpfnWndProc  = (WNDPROC)myclass.WndProc ;
        :
        :
    RegisterClass ( &wc );
    
}


LRESULT CALLBACK MYCLASS::WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
        case WM_CREATE:
            SetTimer( hwnd, 100, 1000,
                (TIMERPROC)myclass.TimerProc );
                           ~~~~~~~←同じクラス内でもオブジェクト名を書かなくてはいけない
            break;
        case WM_LBUTTONDOWN:
            DialogBox( (HINSTANCE)GetWindowLong( hwnd, GWL_HINSTANCE ),
                    MAKEINTRESOURCE(IDD_DIALOG1), hwnd, (DLGPROC)myclass.DialogProc );
            return 0;                                            ~~~~~~~
              :
              :
}

VOID CALLBACK MYCLASS::TimerProc( HWND hwnd, UINT message, UINT id, DWORD dwTime ) {
    :
    :
}

BOOL CALLBACK MYCLASS::DialogProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    :
    :
}

なぜ変数に代入する場合は静的メンバーでなければいけないのか

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