How C++14 and C++17 help to write faster (and better) code. Real world examples

Writing high performance code is always a difficult task. Pure algorithms are not always a good fit for real-world architectures. Once having begun to speed up all these pure algorithms, we quickly find that some implementation is pretty fast on one architecture, but terribly slow on another while the second implementation outperforms the first one in some contexts losing speed in all the rest. Numerous big and small optimizations for each of the supported architectures can quickly bloat our code and waste our time.