Pointer on templated class

[mosfet]

Hi,

I have qome questions about templated class and pointer.
Let's says I have some graphical classes defined like this(WTL framework) :

// represent a view
class CFooView : public CStdDialogImpl< CFooView>
{
public:
enum { IDD = IDD_FOO_FORM };

....
};

// represent a welcome view
class CWelcomeView : public CStdDialogImpl< CWelcomeView>
{
public:
....

};

class CMainFrame :
public CFrameWindowImp l<CMainFrame>,
public CUpdateUI<CMain Frame>,
public CAppWindow<CMai nFrame>,
public CFullScreenFram e<CMainFrame>,
public CMessageFilter,
public CIdleHandler,
public CMDIBase<CMainF rame>
{
public:
virtual BOOL PreTranslateMes sage(MSG* pMsg)
{
if(CFrameWindow Impl<CMainFrame >::PreTranslate Message(pMsg))
return TRUE;

return m_mainView.IsWi ndow() ? m_mainView.PreT ranslateMessage (pMsg) :
FALSE;
}
// our views
CVoxsyncBackupV iew m_mainView;
CWelcomeView m_welcomeView;
???????????? m_curView;
....
};

As you can see in CMainFrame class I have some views defined in it and I
am supposed to be able to switch between them.
The problem comes from the PreTranslateMes sage method, because it is
supposed to point to the current view.

So how could I declare a kind of pointer on the current templated class ?
Until now I was using only one view so PreTranslateMes sage is using
m_mainView but what if I want to use another view ?

[Salt_Peter]

On May 2, 7:46 am, mosfet <john....@anony mous.orgwrote:

Hi,

I have qome questions about templated class and pointer.
Let's says I have some graphical classes defined like this(WTL framework) :

// represent a view
class CFooView : public CStdDialogImpl< CFooView>
{
public:
enum { IDD = IDD_FOO_FORM };

...

};

// represent a welcome view
class CWelcomeView : public CStdDialogImpl< CWelcomeView>
{
public:
...

};

class CMainFrame :
public CFrameWindowImp l<CMainFrame>,
public CUpdateUI<CMain Frame>,
public CAppWindow<CMai nFrame>,
public CFullScreenFram e<CMainFrame>,
public CMessageFilter,
public CIdleHandler,
public CMDIBase<CMainF rame>
{
public:

virtual BOOL PreTranslateMes sage(MSG* pMsg)
{
if(CFrameWindow Impl<CMainFrame >::PreTranslate Message(pMsg))
return TRUE;

return m_mainView.IsWi ndow() ? m_mainView.PreT ranslateMessage (pMsg) :
FALSE;

}

// our views
CVoxsyncBackupV iew m_mainView;
CWelcomeView m_welcomeView;
???????????? m_curView;

...

};

As you can see in CMainFrame class I have some views defined in it and I
am supposed to be able to switch between them.
The problem comes from the PreTranslateMes sage method, because it is
supposed to point to the current view.

So how could I declare a kind of pointer on the current templated class ?
Until now I was using only one view so PreTranslateMes sage is using
m_mainView but what if I want to use another view ?

probably:
CWnd * pView;

However, this has nothing to do with C++. Why not try in a relevant
newsgroup?

[Noah Roberts]

mosfet wrote:

As you can see in CMainFrame class I have some views defined in it and I
am supposed to be able to switch between them.

You can't.

The problem comes from the PreTranslateMes sage method, because it is
supposed to point to the current view.

So how could I declare a kind of pointer on the current templated class ?
Until now I was using only one view so PreTranslateMes sage is using
m_mainView but what if I want to use another view ?

Two ways.

I ran into this issue myself and switched to runtime based dialog
detection. Instead of IDD being an enum it becomes a variable and the
base class a non-template. So there is way number one.

Number two involves studying boost::any and realizing that kind of idiom
can be used to virtualify any interface.

There are probably others but that's my ideas.