lang/inlinethreadlocal.hpp

The following code example is taken from the book
C++17 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2017
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <string>
#include <iostream>

struct MyData {
  inline static std::string gName = "global";            // unique in program
  inline static thread_local std::string tName = "tls";  // unique per thread
  std::string lName = "local";                           // for each object
  //...
  void print(const std::string& msg) const {
    std::cout << msg << '\n';
    std::cout << "- gName: " << gName << '\n';
    std::cout << "- tName: " << tName << '\n';
    std::cout << "- lName: " << lName << '\n';
  }
};

inline thread_local MyData myThreadData;  // one object per thread