SFML threading error

Question

A friend and I are making a simple multiplayer game to practice our coding. Unfortunately we have encountered a problem. The SFML threading system (Not using std::thread because my compiler doesn't support it yet) is giving me an error.

||=== Build: Debug in Clear Void (compiler: GNU GCC Compiler) ===| C:\Users\Name\Documents\Coding\SFML work\Clear_Void\src\GameScreen.cpp||In constructor 'GameScreen::GameScreen()':|

C:\Users\Name\Documents\Coding\SFML work\Clear_Void\src\GameScreen.cpp|9|error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function. Say '&GameScreen::startThread' [-fpermissive]|

C:\SFML-TDM471x32\include\SFML\System\Thread.inl||In instantiation of 'void sf::priv::ThreadFunctor::run() [with T = void (GameScreen::*)()]':|

C:\Users\Name\Documents\Coding\SFML work\Clear_Void\src\GameScreen.cpp|53|required from here|

C:\SFML-TDM471x32\include\SFML\System\Thread.inl|39|error: must use '.' or '->' to call pointer-to-member function in '((sf::priv::ThreadFunctor)this)->sf::priv::ThreadFunctor::m_functor (...)', e.g. '(... -> ((sf::priv::ThreadFunctor*)this)->sf::priv::ThreadFunctor::m_functor) (...)'|

||=== Build failed: 2 error(s), 2 warning(s) (0 minute(s), 4 second(s)) ===|

Here is my code: GameScreen.h

class GameScreen : public Screen
{
public:
    GameScreen();

    void handleInput(sf::RenderWindow&) override;
    void update(sf::RenderWindow&, sf::View&) override;
    void render(sf::RenderWindow&) override;

    void startThread();


private:
    sf::Vector2f moveVal;
    Network network;
    Events eventManager;

    Map m_map;

    sf::Thread networkThread;
};

GameScreen.cpp (Relevant Section)

GameScreen::GameScreen()
: networkThread(&startThread)
{
    network.Connect();
}

I checked the SFML threading tutorials and according to them, that should work. Please help.

Answer 1

startThread should be static. In general, thread functions can't call non-static member functions.