Passing a reference of an handle in C++/CLI

Question

Hello all,

I want to delete a 2 level derived class with a function and putting its handle to null. A piece of code will be helpfull:

ref class bob
{
};

ref class bill : public bob
{
};

ref class jack : public bill
{
};

void DeleteX( bob ^% x )
{
  if( x != nullptr )
  {
    delete x;
    x = nullptr;
  }
}

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
  bill^ one = gcnew jack();
  DeleteX(one);
  System::Diagnostics::Trace::Assert(one == nullptr); //Failed
  return 0;
}

If I use the same type for my declaration and for my function argument, it works. But I want to use the middle type for my declaration and the upper type for the function argument. How can I do this please ?

This is the solution I finally use:

template<class T>
void DeleteX( T ^% x )
{
  if( x != nullptr )
  {
    delete x;
    x = nullptr;
  }
}

Answer 1

It just works for me...

ref class bob
{
};

ref class bill : public bob
{
};

void DeleteX( bob ^% x )
{
  if( x != nullptr )
  {
    delete x;
    x = nullptr;
  }
}

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
    bob^ one = gcnew bill();
    DeleteX(one);
    System::Diagnostics::Trace::Assert(one == nullptr); //did not trigger