Inheritance and CINT

ROOT
1

I have a class called TZMdiFrame that inherits TGMdiFrame.

[code]class TZMdiFrame : public TGMdiFrame {
private:

public:
TZMdiFrame (const TGMdiMainFrame *mainFrame, Int_t w, Int_t h, UInt_t options = 0) {
TGMdiFrame(mainFrame, w,h,options);

} [/code]

The code below that uses the original TGMdiFrame class works fine::

TGMdiFrame *mdiFrame; mdiFrame = new TGMdiFrame(this->fMain, 900, 600, kHorizontalFrame); mdiFrame->SetWindowName("New Window");

The code below that uses the inherited class does not work:

TZMdiFrame *mdiFrame; mdiFrame = new TZMdiFrame(this->fMain, 900, 600, kHorizontalFrame); mdiframe->SetWindowName("New Window");

I am running this in CINT. The error message that I get is:

It points to the third line in the above code .

Please let me know if I should be doing anything in the code to make my inherited class work.

Thanks.

2

Hi,

First of all, please correct you constructor:[code]
class TZMdiFrame : public TGMdiFrame {
private:

public:
TZMdiFrame (const TGMdiMainFrame *mainFrame, Int_t w, Int_t h, UInt_t options = 0) : TGMdiFrame(mainFrame, w, h, options) {}
};[/code]
Then, to verify your code, please use ACLiC: .x yourmacro.C+Note the + after the name of your macro.
Then, if it still doesn’t work, please post a running macro showing the problem.

Cheers,
Bertrand.

3

Hi,

Due the way C++ implements inheritance (virtual table), you must compile any class that inherits from a compiled class. Is TZMdiFrame compiled or interpreted?

Cheers,
Philippe.

4

TZMdiFrame was an interpreted class. In order for inheritance to work, I tried to compile the entire code using ACLiC. The compilation and linking worked with no errors. But, I got the following messages that is unrelated to the original problem:

Both CloseWindow() and HandleMenu(int) methods do exist in the code and they work fine when run in interpretive mode.

Any help will be very much appreciated.

5

Hi,

In order to use signals/slots, you have to generate dictionary for your class. e.g.:[code]class TZMdiFrame : public TGMdiFrame {
…
public:
…
ClassDef(TZMdiFrame, 0)
};

// generate dictionary for TZMdiFrame
#ifdef MAKECINT
#pragma link C++ class TZMdiFrame+;
#endif[/code]
Cheers, Bertrand.

6

Thanks for pointing me in the right direction. I added the ClassDef and pragma statements and tried to compile. Here is the error message I am getting:

I am attaching a tar file containing all the program modules.

As again, any help will be much appreciated.
CAS.tar.gz (4.18 KB)

7

Hi,

You must inherit publicly:class TZMdiFrame : public TGMdiFrame{

Cheers,
Philippe.

8

I changed it to “public” and the compilation works. I am now back to the original problem as seen in this message :

Thanks in advance for your help.

9

Hi,

  1. in TZMainFrame.cpp, please keep:

#ifdef __MAKECINT__ #pragma link C++ class TZMdiFrame+; #endif
2) in TZMdiFrame.h, move these methods to public, as shown below:

public: void HandleTreeDoubleClicked(TGListTreeItem* entry, Int_t btn, Int_t x, Int_t y); void HandleTreeClicked(TGListTreeItem* entry, Int_t btn, Int_t x, Int_t y);
3) in TZMainFrame.h, move these methods to public, as shown below:

public: void CloseWindow(); void AddNewMdiFrame(); void CreateMenuFile(); void CreateMenuEdit(); void CreateMenuView(); void CreateMenuTools(); void CreateMenuWindow(); void CreateMenuHelp(); void EnableDisableMenus(); void NewMenuItemActionPerformed(); void OpenMenuItemActionPerformed(); void CloseMenuItemActionPerformed(); void SaveMenuItemActionPerformed(); void SaveAsMenuItemActionPerformed(); void PrintMenuItemActionPerformed(); void PrintSetupMenuItemActionPerformed(); void ExitMenuItemActionPerformed(); void HandleMenu(Int_t id);
The slot methods have to be public.

Cheers,
Bertrand.

10

Dear Bertrand, Philippe,
Thanks a lot for all your help. Everything works perfectly after I made all your suggested changes. :smiley:

Cheers