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POError: invalid use of member in static member function
 

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  1. POError: invalid use of member in static member function
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    <p>I have two classes, and this is the header of one of them:</p> <pre><code>#ifndef WRAPPER_HPP #define WRAPPER_HPP #include &lt;SDL/SDL.h&gt; using namespace std; class Wrapper { private: //SDL_Surface *screen; public: static SDL_Surface *screen; static void set_screen(SDL_Surface *_screen); static void set_pixel(int x, int y, Uint8 color); static void clear_screen(int r, int g, int b); static SDL_Surface* load_image(char path[500]); static void draw_image(SDL_Surface *img, int x, int y, int width, int height); static void draw_line(int x1, int y1, int x2, int y2, Uint8 color); }; #endif </code></pre> <p>I am calling Wrapper::set_screen(screen) from another file and I get this error:</p> <pre><code>In file included from /home/david/src/aships/src/Wrapper.cpp:6:0: /home/david/src/aships/src/Wrapper.hpp: In static member function ‘static void Wrapper::set_screen(SDL_Surface*)’: /home/david/src/aships/src/Wrapper.hpp:11:18: error: invalid use of member ‘Wrapper::screen’ in static member function /home/david/src/aships/src/Wrapper.cpp:10:3: error: from this location </code></pre> <p>I also get a similar error for the definition of every single function on Wrapper.cpp, for example:</p> <pre><code>void Wrapper::set_pixel(int x, int y, Uint8 color) { /* Draws a pixel on the screen at (x, y) with color 'color' */ Uint8 *p; p = (Uint8 *) screen-&gt;pixels + y * screen-&gt;pitch + x * screen-&gt;format-&gt;BytesPerPixel; *p = color; } </code></pre> <p>On compile:</p> <pre><code>/home/david/src/aships/src/Wrapper.hpp: In static member function ‘static void Wrapper::set_pixel(int, int, Uint8)’: /home/david/src/aships/src/Wrapper.hpp:11:18: error: invalid use of member ‘Wrapper::screen’ in static member function /home/david/src/aships/src/Wrapper.cpp:17:17: error: from this location </code></pre> <p>I know it's related to the class being static and thus the variable Wrapper.screen is not accessible or something, but I'm not sure of how to fix it. Any ideas?</p>
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    1. USDavid Gomes
    1. USDavid Gomes
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      1. POError: invalid use of member in static member function
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      1. VTUpMod
    1. COIt should work... Could you post a minimal complete example?
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      1. POError: invalid use of member in static member function
      1. USBeta
    2. COIt seems You are trying to access a non static member screen inside a static function. You cannot do that because static member functions are not implicitly passed with the this pointer. So unless you make the class instance available to the static function in some way, You cannot access the non static member as you do in non static member functions.
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      1. USAlok Save
    3. COJust noticed that you changed the member to a pointer. Make sure you recompile the source code.
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      1. USAlok Save
 

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