C++ - LNK2001 error altough I have done everything correctly

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I wanted to try myself on a little C++ application, but I all the time get the LNK2001 error and I have no idea what I am doing wrong.

Can someone please help me out?

  #ifndef CONTENTMANAGER_H
    #define CONTENTMANAGER_H

    #include "SFML\Graphics.hpp"
    #include <map>
    #include <sstream>

    using namespace sf;
    using namespace std;


    static class CONTENTMANAGER
    {
    public:
            static Texture getTexture(string textureName)
            {
                    if(textureMap.find(textureName) == textureMap.end())
                    {

                                    Texture texture;
                                    stringstream ss;
                                    ss<<"Texture"<<textureName<<".png";
                                    texture.loadFromFile(ss.str());
                                    textureMap.emplace(textureName, texture);
                                    return textureMap[textureName];

                    }
                    else
                    {
                            return textureMap[textureName];
                    }
            }

    private:
            static map<string,Texture> textureMap;
    };




    #endif

asked 1 min ago

Stefan Caks

1

C++ - LNK2001 error altough I have done everything correctly