Usage for hash tag: C++2019

...write portable code. These are just a few of the new features and enhancements that are available in C++ 2019. For more information, please see the [C++ 2019 language reference](https://en.cppreference.com/w/cpp/20). **Hashtags:** * #C++ * #C++2019 * #NewFeatures * #enhancements * #Programming