//******************************************************** // The following code example is taken from the book // C++20 - The Complete Guide // by Nicolai M. Josuttis (www.josuttis.com) // http://www.cppstd20.com // // The code is licensed under a // Creative Commons Attribution 4.0 International License // http://creativecommons.org/licenses/by/4.0/ //******************************************************** #ifndef TRUTH_HPP #define TRUTH_HPP struct Truth { int value; constexpr Truth() : value{42} { // enable compile-time initialization } }; constexpr Truth theTruth; // force compile-time initialization #endif // TRUTH_HPP