CEGUI::Singleton inheritence

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CEGUI::Singleton inheritence

Postby Sotai » Sun May 21, 2006 09:44

Hi, I'm part in a team that's developing a game the uses CEGUI. And I noticed that the class CEGUI::Singleton class existed and I thought it would be neat if i could use that. But is it possible to inherit this class from the libraries and not the sourcec version of CEGUI, because I get some odd linker errors. Here my class definition code:

Code: Select all

class gGUIManager : public CEGUI::Singleton<gGUIManager>
   static gGUIManager guiMgr;

   CEGUI::OpenGLRenderer *renderer;
   CEGUI::Window *rootWnd;
   CEGUI::WindowManager *wndMgr;
   bool initialized;

   gGUIManager(int w, int h);

Heres the contructor code:

Code: Select all

gGUIManager::gGUIManager(int w, int h)
   static_cast<gGUIManager*>(this->ms_Singleton)->renderer =
      new CEGUI::OpenGLRenderer(0, w, h);
   new CEGUI::System(static_cast<gGUIManager*>(this->ms_Singleton)->renderer);

   static_cast<gGUIManager*>(this->ms_Singleton)->wndMgr = CEGUI::WindowManager::getSingletonPtr();

Heres the errors:

Code: Select all

Error   1   error LNK2001: unresolved external symbol "__declspec(dllimport) protected: static class gGUIManager * CEGUI::Singleton<class gGUIManager>::ms_Singleton" (__imp_?ms_Singleton@?$Singleton@VgGUIManager@@@CEGUI@@1PAVgGUIManager@@A)   release.obj   

Error   2   error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall CEGUI::Singleton<class gGUIManager>::~Singleton<class gGUIManager>(void)" (__imp_??1?$Singleton@VgGUIManager@@@CEGUI@@QAE@XZ)   release.obj   

Error   3   error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall CEGUI::Singleton<class gGUIManager>::Singleton<class gGUIManager>(void)" (__imp_??0?$Singleton@VgGUIManager@@@CEGUI@@QAE@XZ)   release.obj   

Error   4   fatal error LNK1120: 3 unresolved externals   C:\Documents and Settings\jimsag01\Mina dokument\c++\VS Projects\gEngine\\bin\release\gEngine.exe   

Are there some methods I need to override maybe?

Anyone have a clue?

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Postby lindquist » Sun May 21, 2006 16:28

A singleton template is really simple to write. I would suggest you do that instead.

But you're not using it correctly either. Take a look at the CEGUI sources and see what they do.

It's mostly involving the ms_Singleton member.


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