Question

i have 2 classes in different namespaces and both of them needs to include same Image.h class but when i include at the same time i get an error. Here my classes:

FilterManager.h:

#ifndef FILTERMANAGER_H_
#define FILTERMANAGER_H_

#include "../Images/Image.h"
namespace Filter {

class FilterManager {
public:
    Image* applyFilter(int filterType, PGMImage *pgmImage);

};

} /* namespace Filter */
#endif /* FILTERMANAGER_H_ */

Main Application class : This includes Images/Image.h and Filter/FilterManager.h at the same time and i get an error.

#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <stdio.h>
#include "Images/Image.h"
#include "Filter/FilterManager.h"


using namespace std;

int main() {

    //new typename ImageIO::ImageIO;

    Images::Image *Image = NULL;

    Filter::FilterManager::getInstance();

    pgmImage = imageIO->readPGM("Resources/house.256.pgm");

    return 0;
}

And Image.h class

#ifndef IMAGE_H_
#define IMAGE_H_

#include "Image.h"



namespace Images {

class Image {
public:
    Image();
    virtual ~Image();


private:
    int** imatrix(int nrl,int nrh,int ncl,int nch);
};

} /* namespace Image */
#endif /* IMAGE_H_ */

Thanks for any help

Answer 1

class FilterManager {
public:
   Images::Image* applyFilter(int filterType, PGMImage *pgmImage);
};

You forgot the namespace.

I don’t see any #include “PGMImage.h”
Where is it? And what is PGMImage?

Why in Image.h there is an include to Image.h?