Archived

This topic is now archived and is closed to further replies.

Zeblar Nagrim

vector list problem

Recommended Posts

Zeblar Nagrim    150
Hello, I have problems with the std::vector class:
  
CreateWnd()
{

...

CGUIWnd wnd = CGUIWnd(idwnd,x,y,w,h);
m_aWnds.push_back(wnd);

CGUIButton button = CGUIButton(idbutton,m_aWnds.back(),x,y,w,h);
m_aButtons.push_back( button );

...
}
  
What happens? I create a window and than a button. The window are registered as the parent for the button. CGUIButton is derived from CGUIWnd. In the CGUIButton class I have a pointer to a CGUIWnd (that is the parent of the button). This works fine first time the function is called but when the second window is created the first button (the button on the window) get crap values! Something happens when the vector object m_aButtons inserts a new element to the list. I think it is because of the CGUIWnd pointer in the CGUIButton class. When a new element is inserted in m_aWnds the pointer in CGUIButton class isn´t valid anymore. Please help! Zeblar Nagrim, Lord of Chaos

Share this post


Link to post
Share on other sites
Stoffel    250
With the limitted code you''ve put here, it appears that your problem is in the definition of your vector. It looks like you''re defining a vector of objects, not pointers, and pushing-in derived class objects. This will not work. In order to use polymorphism in STL containers you have to use pointers (or smart pointers), not objects.

Share this post


Link to post
Share on other sites
Zeblar Nagrim    150
Thanks for your advise!

You want me to change from,
   std::vector<CGUIButton> m_aButtons;   
to
   std::vector<CGUIButton*> m_aButtons;   
?

Edited by - Zeblar Nagrim on January 30, 2002 5:39:21 PM

Share this post


Link to post
Share on other sites