Unresolved external symbol on static class members

by

If you are using C++ 17 you can just use the inline specifier (see https://stackoverflow.com/a/11711082/55721)

If using older versions of the C++ standard, you must add the definitions to match your declarations of X and Y

unsigned char test::X;
unsigned char test::Y;

somewhere. You might want to also initialize a static member

unsigned char test::X = 4;

and again, you do that in the definition (usually in a CXX file) not in the declaration (which is often in a .H file)

More Related Contents:

  1. Static constant string (class member)
  2. How do you create a static class in C++?
  3. Accessing static class variables in C++?
  4. Do static members of a class occupy memory if no object of that class is created?
  5. C++ cannot initialize static data member [duplicate]
  6. Is it possible to pass a class as an argument of a function in C++
  7. Pointer to class data member “::*”
  8. Forward declaration of nested types/classes in C++
  9. Undefined reference to static variable c++
  10. Superiority of unnamed namespace over static?
  11. Destruction order of static objects in C++
  12. Type of ‘this’ pointer
  13. C++ Overload Static Function with Non-Static Function
  14. Does static constexpr variable inside a function make sense?
  15. How can I get the class name from a C++ object?
  16. C++ class header files organization
  17. How to add constructors/destructors to an unnamed class?
  18. How to use WndProc as a class function [duplicate]
  19. Class template with template class friend, what’s really going on here?
  20. Overriding static variables when subclassing
  21. Why static variable needs to be explicitly defined?
  22. What does “operator = must be a non-static member” mean?
  23. C++ class forward declaration
  24. How to create a template function within a class? (C++)
  25. No matching function for call to Class Constructor
  26. passing object by reference in C++
  27. Can you start a class name with a numeric digit?
  28. On local and global static variables in C++
  29. Forward Declaration of variables/classes in std namespace
  30. Scope resolution operator being used twice

Leave a Comment