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E2457: Delphi style classes must be caught by reference (C++)
Example
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You can only catch a Delphi style object by pointer. 

 

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