The following code example is taken from the book
C++20 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2021
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
#include "truth.hpp"
#include <iostream>
int val = theTruth.value; // may be initialized before theTruth is initialized
int main()
{
std::cout << val << '\n'; // OOPS: may be 0 or 42
++val;
std::cout << val << '\n'; // OOPS: may be 1 or 43
}