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 "truthc.hpp"
#include <iostream>
constinit int val = theTruth.value ; // initialized after theTruth is initialized
int main()
{
std::cout << val << '\n'; // guaranteed to be 42
++val;
std::cout << val << '\n'; // guaranteed to be 43
}