SFML Book Project - Can't find the mistake

[Soziapath]

Hello SFML-dev community,

I'm currently programming the project from the SFML Game Developüment book.
Due to the fact that the shown code and their explanation don't match, i sometimes got errors, which i can normally fix without much effort. But this time i just can't fix it...

I finished the SceneNode tutorial and my Entity Class should be able to inherit SceneNode, but there are link-errors. If i delet the inheritation from the Entity Class there is no error...

Here's a link to the download of my project
http://www.file-upload.net/download-9677731/SFML-Book.7z.html
And Antivirus-Scan if you don't trust me^^
https://www.virustotal.com/de/file/42d757e041a40521a9a2f061aacad1c07ffba5d8e47f069adaf9ac0e117d8e18/analysis/1413200850/

Or if the Code of Entity and SceneNode is enaugh..

SceneNode.h

(click to show/hide)

#ifndef SCENENODE_H
#define SCENENODE_H

#include <memory>
#include <vector>
#include <algorithm>
#include <cassert>


#include <SFML\Graphics.hpp>

class SceneNode : public sf::Transformable, public sf::Drawable, private sf::NonCopyable
{
public:
        typedef std::unique_ptr<SceneNode> Ptr;

public:

                                                SceneNode();

        void                            attachChild(Ptr child);
        Ptr                                     detachChild(const SceneNode& node);

private:
        virtual void            draw(sf::RenderTarget& target, sf::RenderStates states) const;
        virtual void            drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const;
       

private:
        std::vector<Ptr>        mChildren;
        SceneNode*                      mParent;
};

#endif

Entity.h

(click to show/hide)

#ifndef ENTITY_H
#define ENTITY_H

#include <iostream>
#include <cassert>

#include "SFML\Graphics.hpp"
#include "SceneNode.h"

class Entity : SceneNode
{
public:
        void                    setVelocity(sf::Vector2f);
        void                    setVelocity(float, float);

        sf::Vector2f    getVelocity() const;
private:

private:

        sf::Vector2f    mVelocity;

};


#endif

if you use the Project, my sfml-files are in D:\SFML-2.1x86

Hope you can help me...
Soziapath

[eXpl0it3r]

You need to provide the errors as well. We can't really work with "something is broken, here's the code, figure it out please".
And yeah nobody is really going to download the full project. Instead you should further isolate the issue.

The book intentionally doesn't show all the code used in the end, as such it's required to look at the full code. However the archive from Packt itself is outdated. The error free code can be found here.

[Soziapath]

Sorry, are now attachted to this reply...

[Nexus]

As eXpl0it3r said, you should get the code from GitHub, as it is correct and up-to-date.

If you really want to write it on your own -- which is rather pointless if you do it 1:1 -- you have to consider the usual things to avoid linker errors: make sure the function definition is available to the compiler (i.e. in a .cpp file that will be compiled), and that its signature matches the function declaration exactly.