C / C++ / MFC

//singleton.h
class singleton
{
  public:
    static singleton * get_instance();
  private:
    singleton(); // private ctor, ensures the only way to get a singleton
                 // is thru get_instance.
    singleton * instance;
};
//singleton.cpp
singleton * singleton::instance=0;
 
singleton * singleton::get_instance()
{
  if(!singleton){ // first time initialization
    singleton = new singleton();
  }
  return singleton;
}
 
singleton::singleton()
{
  // initialization stuff.
}

class CMyApp : public CWinApp
{
....

  public:
    CObArray    MyObArray;
}

((CMyApp *) AfxGetApp())->MyObArray

CComPtr<IMessenger>pIM;
CComPtr<IDispatch>pdispWindow;
 
  pIM.CoCreateInstance ( CLSID_Messenger, NULL, CLSCTX_LOCAL_SERVER );
  pIM->InstantMessage ( CComVariant("contactname@hotmail.com"), &pdispWindow );