E2457 Delphi style classes must be caught by reference (C++)

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You can only catch a Delphi style object by pointer. Delphi style classes derive directly or indirectly from System::TObject.

Example:

void foo(TObject *p)
{
     try
     {
          throw(p);
     }
     catch    (TObject o)    // Error
     {
     }
     catch  (TObject *op)    // OK
     {
     }
}