Question

I would like to know how to write unmanaged exceptions in Visual C++?

#include <string>
#include <exception>

using namespace std;
using namespace System;

class GraphException : public Exception
{
public:
    GraphException() { }
//  GraphException(string message) : Exception (message)
//  { }
//  GraphException(string message, Exception inner) : Exception (message, inner)
//  { }
};

this does not work i get the following error,

Error 1 error C3625: ‘GraphException’: an unmanaged type cannot derive
from a managed type
‘System::Exception’ c:\breadthfirst\graph\graphexception.h 10 1 breadthFirst

Can someone please help me?

Answer 1

Derive from std::exception instead of Exception.

Better yet derive from one of the more specialized exceptions in stdexcept.