void reset(
   _element_type ^ _new_ptr
);
void reset();

// msl_auto_handle_reset.cpp
// compile with: /clr
#include <msclr\auto_handle.h>

using namespace System;
using namespace msclr;

ref class ClassA {
   String^ m_s;
public:
   ClassA( String^ s ) : m_s( s ) {
      Console::WriteLine( "ClassA constructor: " + m_s );
   }
   ~ClassA() {
      Console::WriteLine( "ClassA destructor: " + m_s );
   }

   void PrintHello() {
      Console::WriteLine( "Hello from {0} A!", m_s );
   }
};

int main()
{
   auto_handle<ClassA> agc1 = gcnew ClassA( "first" );
   agc1->PrintHello();

   ClassA^ ha = gcnew ClassA( "second" );
   agc1.reset( ha ); // release first object, reference second
   agc1->PrintHello();

   agc1.reset(); // release second object, set to nullptr

   Console::WriteLine( "done" );
}

ClassA constructor: first
Hello from first A!
ClassA constructor: second
ClassA destructor: first
Hello from second A!
ClassA destructor: second
done