Undefined reference to static variable c++

by

I don’t want a static foo() function

Well, foo() is not static in your class, and you do not need to make it static in order to access static variables of your class.

What you need to do is simply to provide a definition for your static member variable:

class Helloworld {
  public:
     static int x;
     void foo();
};

int Helloworld::x = 0; // Or whatever is the most appropriate value
                       // for initializing x. Notice, that the
                       // initializer is not required: if absent,
                       // x will be zero-initialized.

void Helloworld::foo() {
     Helloworld::x = 10;
};

More Related Contents:

  1. C++ cannot initialize static data member [duplicate]
  2. Unresolved external symbol on static class members
  3. Static array vs. dynamic array in C++
  4. Initialize static variables in C++ class?
  5. Superiority of unnamed namespace over static?
  6. Deprecation of the static keyword… no more?
  7. Can’t set value of static object field (error LNK2001: unresolved external symbol)
  8. Destruction order of static objects in C++
  9. How do you create a static class in C++?
  10. C++ Overload Static Function with Non-Static Function
  11. static and extern global variables in C and C++
  12. Does static constexpr variable inside a function make sense?
  13. Are static variables in a base class shared by all derived classes?
  14. C++ singleton vs. global static object
  15. C++ static template member, one instance for each template type?
  16. Is there any way to building static Qt with static OpenSSL?
  17. What is the difference between a static and const variable?
  18. Using boost thread and a non-static class function
  19. How is static variable initialization implemented by the compiler?
  20. C++ – Why static member function can’t be created with ‘const’ qualifier
  21. Overriding static variables when subclassing
  22. Why static variable needs to be explicitly defined?
  23. Difference between initialization of static variables in C and C++
  24. Do static members of a class occupy memory if no object of that class is created?
  25. Undefined reference to a static member of the class
  26. Member function with static linkage
  27. How to execute a piece of code only once?
  28. Why is a C++ bool var true by default?
  29. How to ignore false positive memory leaks from _CrtDumpMemoryLeaks?
  30. On local and global static variables in C++

Leave a Comment