Book Image

C++17 STL Cookbook

By : Jacek Galowicz
Book Image

C++17 STL Cookbook

By: Jacek Galowicz

Overview of this book

C++ has come a long way and is in use in every area of the industry. Fast, efficient, and flexible, it is used to solve many problems. The upcoming version of C++ will see programmers change the way they code. If you want to grasp the practical usefulness of the C++17 STL in order to write smarter, fully portable code, then this book is for you. Beginning with new language features, this book will help you understand the language’s mechanics and library features, and offers insight into how they work. Unlike other books, ours takes an implementation-specific, problem-solution approach that will help you quickly overcome hurdles. You will learn the core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on practical real-world recipes. These recipes will help you get the most from the STL and show you how to program in a better way. By the end of the book, you will be up to date with the latest C++17 features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (18 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Converting between different time units using std::ratio


Since C++11, the STL contains some new types and functions for taking, measuring, and displaying time. This part of the library exists in the std::chrono namespace and has some sophisticated details.

In this recipe, we will concentrate on measuring time spans and how to convert the result of the measurement between units, such as seconds, milliseconds, and microseconds. The STL provides facilities, which enable us to define our own time units and convert between them seamlessly.

How to do it...

In this section, we will write a little game that prompts the user to enter a specific word. The time that the user needs to type this word into the keyboard is measured and displayed in multiple time units:

  1. At first, we need to include all the necessary headers. For reasons of comfort, we declare that we use the std namespace by default:
      #include <iostream>
      #include <chrono>
      #include <ratio>
      #include &lt...