"Attempting to reference a deleted function." when returning a sf::RenderWindow

[Enyss]

Hello,

 I have a strange error when I try to return a RenderWindow reference from a singleton class:

 Error C2280 'sf::RenderWindow::RenderWindow(const sf::RenderWindow &)': attempting to reference a deleted function.

Minimal code :

#include <SFML\Graphics.hpp>

class RenderManager
{
public:
        RenderManager();
        static RenderManager & rm();

        sf::RenderWindow & getWindow();
private:
        sf::RenderWindow window;
};

RenderManager::RenderManager()
{
        window.create(sf::VideoMode(800, 600), "Realms of Dream");
        tileSet.loadFromFile("gfx/tileset.png");
}

RenderManager & RenderManager::rm()
{
        static RenderManager rm;
        return rm;
}

sf::RenderWindow & RenderManager::getWindow()
{
        return window;
}

Thanks.

[Hiura]

That's what happen when you try to copy something that ain't copyable.

[Enyss]

In fact, I return a reference (I made a copy mistake in the code I pasted here), so it should works no?

[Nexus]

Can you provide a minimal complete example?
Also tell us where the error occurs.

The idea of it is also to have 1:1 copyable code, so that such mistakes can't happen

[Enyss]

This is a minimal code that show the error:

#include <SFML\Graphics.hpp>

class RenderManager
{
public:
        RenderManager();
        static RenderManager & rm();

        sf::RenderWindow & getWindow();
private:
        sf::RenderWindow window;
};

RenderManager::RenderManager()
{
        window.create(sf::VideoMode(800, 600), "Realms of Dream");
}

RenderManager & RenderManager::rm()
{
        static RenderManager rm;
        return rm;
}

sf::RenderWindow & RenderManager::getWindow()
{
        return window;
}

int main()
{
        sf::RenderWindow window = RenderManager::rm().getWindow();
        return 0;
}
 

[Hapax]

sf::RenderWindow window = RenderManager::rm().getWindow();

This is copying the RenderWindow from rm to the newly constructed window.

EDIT: If you are storing the windows in the manager and accessing them, don't copy them, reference them by creating a reference instead.
i.e.

sf::RenderWindow& window = RenderManager::rm().getWindow();

[Enyss]

Oh thanks... I missed this -_-'