Error: invalid use of member in static member function

I have two classes, and this is the header of one of them:

#ifndef WRAPPER_HPP
#define WRAPPER_HPP

#include <SDL/SDL.h>

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

I am calling Wrapper::set_screen(screen) from another file and I get this error:

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

I also get a similar error for the definition of every single function on Wrapper.cpp, for example:

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->pixels + y * screen->pitch + x * screen->format->BytesPerPixel;
  *p = color;
}

On compile:

/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

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?

Related Posts:

  1. Separating class code into a header and cpp file
  2. Error “C++ requires a type specifier for all declarations whilst defining methods”
  3. What are the differences between struct and class in C++?
  4. Expression must have class type
  5. When should you use a class vs a struct in C++?
  6. What is the difference between private and protected members of C++ classes?
  7. c++ “Incomplete type not allowed” error accessing class reference information (Circular dependency with forward declaration)
  8. Why is enum class preferred over plain enum?
  9. Reading from file in c++ ifstream
  10. Why am I getting this redefinition of class error?
  11. Single class has a Class Redefinition Error
  12. C++ Linked List Node with class
  13. (->) arrow operator and (.) dot operator , class pointer
  14. how to define -std=c++11 as default in g++
  15. Pointer to incomplete class type is not allowed
  16. Why am I getting this redefinition of class error?
  17. no default constructor exists for class
  18. Error at constructor : Expected an identifier?
  19. Getting error “a nonstatic member reference must be relative to a specific object” while both member are in the same class
  20. C++ BlackJack Stuck trying to program Ace
  21. error C2011: ” : ‘class’ type redefinition
  22. The compiler is complaining about my default parameters?
  23. Already defined in .obj – no double inclusions
  24. C++ Linked List Node with class
  25. Getting error: ISO C++ forbids declaration of with no type
  26. fatal error LNK1169: one or more multiply defined symbols found in game programming
  27. How to call a parent class function from derived class function?
  28. “used without template parameters”
  29. expected constructor, destructor, or type conversion before ‘(’ token
  30. C++ Class ‘undeclared identifier”
  31. c++ “Incomplete type not allowed” error accessing class reference information (Circular dependency with forward declaration)
  32. Base class undefined
  33. Warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11?
  34. What is the meaning of a C++ Wrapper Class?
  35. Does C++11 have C#-style properties?
  36. G++ undefined reference to class::function
  37. Creating an instance of class
  38. expected primary-expression before ‘]’ token
  39. When/why to make function private in class?
  40. error C2039: ‘string’ : is not a member of ‘std’, header file problem
  41. istream and ostream problem – C++
  42. Struct with template variables in C++
  43. error: no member function declared in class
  44. Here is some error with my .h file which show [Error] unterminated #ifndef when I include my class template in it
  45. C++ equivalent of java’s instanceof
  46. Is “delete this” allowed in C++?
  47. What is a segmentation fault?
  48. How many spaces for tab character(\t)?
  49. How to create a dynamic array of integers
  50. How to create a dynamic array of integers
  51. Linker Error C++ “undefined reference ” [duplicate]
  52. How do I build a graphical user interface in C++? [closed]
  53. C++ convert from 1 char to string?
  54. How do I build a graphical user interface in C++? [closed]
  55. convert a char* to std::string
  56. system(“pause”); – Why is it wrong?
  57. Pause Console in C++ program
  58. What is the purpose of the word ‘self’?
  59. system(“pause”); – Why is it wrong?
  60. Pause Console in C++ program
  61. How to implement 2D vector array?
  62. Why the switch statement cannot be applied on strings?
  63. What is the difference between g++ and gcc?
  64. How to use setprecision in C++
  65. How to dynamically allocate arrays in C++
  66. What does (~0L) mean?
  67. How to dynamically allocate arrays in C++
  68. What is the best way to use a HashMap in C++?
  69. Understanding Python super() with __init__() methods [duplicate]
  70. What is the best way to use a HashMap in C++?
  71. What are the differences between a pointer variable and a reference variable in C++?
  72. What is an undefined reference/unresolved external symbol error and how do I fix it?
  73. Sleep for milliseconds
  74. How to convert string to char array in C++?
  75. How can I convert a std::string to int?
  76. Easiest way to convert int to string in C++
  77. What is the difference between float and double?
  78. Why is “using namespace std;” considered bad practice?
  79. What is the easiest way to initialize a std::vector with hardcoded elements?
  80. outputting ascii table in C++
  81. What is a lambda expression in C++11?
  82. Vector of Vectors to create matrix
  83. How to throw a C++ exception
  84. std::string to char*
  85. How to generate a random number in C++?
  86. pinpointing “conditional jump or move depends on uninitialized value(s)” valgrind message
  87. What is an undefined reference/unresolved external symbol error and how do I fix it?
  88. How do I find the length of an array?
  89. Sleep for milliseconds
  90. How to convert string to char array in C++?
  91. C++ — expected primary-expression before ‘ ‘
  92. Using getline() with file input in C++
  93. What is the effect of extern “C” in C++?
  94. C++ Cout & Cin & System “Ambiguous” [closed]
  95. ld: symbol(s) not found for architecture x86_64 error
  96. C++ string to double conversion
  97. Why are #ifndef and #define used in C++ header files?
  98. g++ ld: symbol(s) not found for architecture x86_64
  99. What exactly is the difference between “pass by reference” in C and in C++?
  100. How to throw a C++ exception

Leave a Comment

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)