template<typename _other_type>  
operator auto_handle<_other_type>();  

// msl_auto_handle_op_auto_handle.cpp  
// compile with: /clr  
#include <msclr\auto_handle.h>  
  
using namespace System;  
using namespace msclr;  
  
ref class ClassA {  
protected:     
   String^ m_s;  
public:  
   ClassA( String^ s ) : m_s( s ) {}  
  
   virtual void PrintHello() {  
      Console::WriteLine( "Hello from {0} A!", m_s );  
   }  
};  
  
ref class ClassB : ClassA {  
public:  
   ClassB( String ^ s) : ClassA( s ) {}  
   virtual void PrintHello() new {  
      Console::WriteLine( "Hello from {0} B!", m_s );  
   }  
};  
  
int main() {  
   auto_handle<ClassB> b = gcnew ClassB("first");  
   b->PrintHello();  
   auto_handle<ClassA> a = (auto_handle<ClassA>)b;  
   a->PrintHello();  
}  

Hello from first B!  
Hello from first A!