forward declaration and enums

[Barry]

I have the following class which won't compile in VS2008.

#include "Image.h"

class b : public std::map<const b_e, const Image>
{
public:

enum b_e {ONE,TWO};
};

How would you fix this problem? The only solution I have come up with
is this -

#include "Image.h"

class b
{
public:

enum b_e {ONE,TWO};
std::map<const b_e, const Image> i;
};

but is there a better way of doing it?

Thanks,

Barry.