I have tried so many things and I am stumped. I keep getting a redefinition error and cannot for the life of me understand what the problem is.

This is making me lose my mind so some help would be greatly appreciated 🙂

The compilation commands I am using:

g++ -o TESTFM.o -c FileManagement/filemanager.h
g++ -o TESTEX.o main.cpp TESTFM.o

main.cpp

#include "FileManagement/filemanager.h"

#include <iostream>

using namespace std;

int main () {
        Config::loadFromFile ("test.config");

        cout << Config::regionFile << endl;
        cout << Config::maxTime << endl;
        cout << Config::refreshRt << endl;

        RegionLayout::loadFromFile ();

        cout << RegionLayout::getCell (2, 2) << endl;
        cout << RegionLayout::x << " x " << RegionLayout::y << endl;

        return 0;
}

FileManagement/filemanager.h

#ifndef FILEMANAGER_H
#define FILEMANAGER_H
#pragma once

#include <vector>
#include <string>

class City;

namespace Config {
        std::string regionFile; // relative path to file containing region layout
        int maxTime; // maximum number of time steps
        int refreshRt; // refresh rate (i.e. output every n time steps)
        void loadFromFile (std::string path); // loads config from the given path
};

namespace RegionLayout {
        int x, y; // stores size of initial region layout
        char layout[16][16]; // stores double array of initial layout
        char getCell (int x, int y); // get initial layout cell at position (x, y)
        void loadFromFile (); // loads layout from file at path Config.regionFile
        City generateCity (); // returns a City generated from initial layout (raises error if data not loaded from file)
};

namespace OutputManager {
        std::vector<std::string> outputLines; // stores all output lines
        void commitLine (std::string line); // adds line to outputLines
        void commitToFile (std::string path); // writes to file at path
};

#endif

FileManagement/filemanager.cpp

#ifndef FILEMANAGER_CPP
#define FILEMANAGER_CPP

#include "filemanager.h"

#include <vector>
#include <string>

#include <iostream>
#include <fstream>
#include <sstream>

using namespace std;

void Config::loadFromFile (string path) {
        ifstream file;
        file.open (path);

        string tmp;

        getline (file, Config::regionFile);

        getline (file, tmp);
        Config::maxTime = stoi (tmp);

        getline (file, tmp);
        Config::refreshRt = stoi (tmp);

        file.close ();
}

char RegionLayout::getCell (int x, int y) {
        return RegionLayout::layout[x][y];
}

void RegionLayout::loadFromFile () {
        int x = 0;
        int y = 0;

        int width = 0;

        ifstream file;
        file.open (Config::regionFile);

        string tmp, tmp2;

        while (getline (file, tmp)) {
//              cout << "Line " << tmp << endl;
                x = 0;

                istringstream iss (tmp);
                while (getline (iss, tmp2, ',')) {
//                      cout << "Char '" << tmp2 << "'" << endl;
                        RegionLayout::layout[x][y] = tmp2[0];
                        x++;
                }

                if (x > width) width = x;

                y++;
        }

        RegionLayout::x = width;
        RegionLayout::y = y;
}

#endif