Problem w/ porting and static...

I've run into a problem trying to port a program of mine from C to C++, I am using MSVC++.

Code:

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Controller.obj : error LNK2001: unresolved external symbol "private: static struct Color (*  PixelBuffer::myPixelBuffer)[512]" (?myPixelBuffer@PixelBuffer@@0PAY0CAA@UColor@@A)

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Code:

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#ifndef PixelBuffer_h
#define PixelBuffer_h

#include "Types.h"

class PixelBuffer {
private:
        PixelBuffer () {}; // Can't create one.
        static Color myPixelBuffer[512][512]; // <-- Error here

public:
        static void put (int x, int y, Color color) {PixelBuffer::myPixelBuffer[x][y] = color;}
        static void display (
                void (*initialize) (int width, int depth),
                void (*process) (int x, int y, Color color),
                void (*finalize) (void))
        {
               
                int i, j;
                initialize (512, 512);
                for (i = 0; i < 512; i++) {
                        for (j = 0; j < 512; j++) {
                                process (i, j, myPixelBuffer[i][j]);
                        }
                }

                finalize();

                return;
        }
}; // End class PixelBuffer

#endif

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Code:

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/*
typedef struct {
        int red;
        int green;
        int blue;
} Color;
*/

struct Color {
        int red, green, blue;
};

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Now, I'm a little stuck. I don't suppose anyone knows the remedy to this problem?

Could it be that your typedef struct Color has been commented out?

It doesn't matter whether I use the typedef, or the C++ style struct.

Also, maybe I should have mentioned this, that last code block is a snippet from Types.h

If you're using

static Color myPixelBuffer[512][512];

you'll probably have to define it (something like) -

Color PixelBuffer::myPixelBuffer[512][512];

outside the class

What you've got is just the declaration when it's a static member (because you don't need to create an instance of the class for the variable to exist). If this doesn't help post more of the code and the reason you've made the constructor private.

Thanks Sorensen. Creating a PixelBuffer.cpp with this made it work:

Code:

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#include "Types.h"
#include "PixelBuffer.hpp"

Color PixelBuffer::myPixelBuffer[512][512];

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