Managed C++/CLI

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      // Defines a key for storing the delegate for the Click event
      // in the Events list.
      private static readonly object ClickEvent = new object();
      
      // Defines the Click event using the event property syntax.
      // The Events property stores all the event delegates of
      // a control as name/value pairs. 
      public event EventHandler Click 
      {
         // When a user attaches an event handler to the Click event 
         // ( Click += myHandler; ), the Add method 
         // adds the handler to the 
         // delegate for the Click event (keyed by ClickEvent 
         // in the Events list).
         add 
         {
            Events.AddHandler(ClickEvent, value);
         }
         // When a user removes an event handler from the Click event 
         // ( Click -= myHandler; ), the Remove method 
         // removes the handler from the 
         // delegate for the Click event (keyed by ClickEvent 
         // in the Events list).
         remove 
         {
            Events.RemoveHandler(ClickEvent, value);
         }
      }
      
      // Invokes delegates registered with the Click event.
      //
      protected virtual void OnClick(EventArgs e) 
      {
         // Retrieves the event delegate for the Click event
         // from the Events property (which stores
         // the control's event delegates). You must
         // cast the retrieved delegate to the type of your 
         // event delegate.
         EventHandler clickEventDelegate = (EventHandler)Events[ClickEvent];
         if (clickEventDelegate != null) {
            clickEventDelegate(this, e);
         }  
      }
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#using <mscorlib.dll>

using namespace System;
using namespace System::Text;

void GetString(StringBuilder* pOut)
{
   pOut->set_Length(0);
   pOut->Append("Out--string");
}

int _tmain()
{
   StringBuilder* pOut = new StringBuilder("In--string");

   GetString(pOut);

   Console::WriteLine(pOut->ToString());

   return 0;
}