Same file used to build DLL in two projects under one solution

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C++

DLL

I've got this one particular class that I wish to share between two DLL projects under the same solution.

Currently, I copied the file into the two project folders and included both a #pragma once and #ifndef guard.

I was wondering if there is a better solution for it.
The only difference in the both codes is that they both use different #define for the

_declspec(dllexport)

.

Just to give you a rough idea what both looks like:

#pragma once
#ifndef ITEM_H

class CItem
{
public:
DLL1_API CItem(void);
DLL1_API ~CItem(void);

DLL1_API int getValue(void) const;
DLL1_API void setValue(int value);

/*
Remaining methods with the similar signatures.
*/
}

#pragma once
#ifndef ITEM_H
class CItem
{
public:
DLL2_API CItem(void);
DLL2_API ~CItem(void);
DLL2_API int getValue(void) const;
DLL2_API void setValue(int value);
/*
Remaining methods with the similar signatures.
*/
}

Both DLL1_API and DLL2_API are current set to

_declspec(dllexport)