Initialize static variables in C++ class?

by

They can’t be initialised inside the class, but they can be initialised outside the class, in a source file:

// inside the class
class Thing {
    static string RE_ANY;
    static string RE_ANY_RELUCTANT;
};

// in the source file
string Thing::RE_ANY = "([^\\n]*)";
string Thing::RE_ANY_RELUCTANT = "([^\\n]*?)";

Update

I’ve just noticed the first line of your question – you don’t want to make those functions static, you want to make them const. Making them static means that they are no longer associated with an object (so they can’t access any non-static members), and making the data static means it will be shared with all objects of this type. This may well not be what you want. Making them const simply means that they can’t modify any members, but can still access them.

More Related Contents:

  1. C++ cannot initialize static data member [duplicate]
  2. When are static C++ class members initialized?
  3. When are static and global variables initialized?
  4. Are function static variables thread-safe in GCC?
  5. C++ where to initialize static const
  6. How is static variable initialization implemented by the compiler?
  7. static member initialization for specialized template class
  8. What do the following phrases mean in C++: zero-, default- and value-initialization?
  9. Stack, Static, and Heap in C++
  10. Static array vs. dynamic array in C++
  11. Static variables initialisation order
  12. What are the signs of crosses initialization?
  13. Is reading an indeterminate value undefined behavior?
  14. C++ singleton vs. global static object
  15. Easy way find uninitialized member variables
  16. When should I write the keyword ‘static’ before a non-member function?
  17. What Is a Curly-Brace Enclosed List If Not an intializer_list?
  18. C++ Structure Initialization [duplicate]
  19. Is this self initialization valid?
  20. Is it safe to use the “this” pointer in an initialization list?
  21. How to create std::array with initialization list without providing size directly [duplicate]
  22. Adding static libcurl to Code::Blocks IDE
  23. What’s the difference between Radio r = Radio(“PSR”, 100.8) and Radio(“PSR”, 100.8)?
  24. Member function with static linkage
  25. How to initialize a struct to 0 in C++
  26. Is there a way to statically-initialize a dynamically-allocated array in C++?
  27. Why is a C++ bool var true by default?
  28. How to ignore false positive memory leaks from _CrtDumpMemoryLeaks?
  29. Why should I prefer to use member initializer lists?
  30. C++ Member Initializer List

Leave a Comment