Book Image

C++20 STL Cookbook

By : Bill Weinman
Book Image

C++20 STL Cookbook

By: Bill Weinman

Overview of this book

Fast, efficient, and flexible, the C++ programming language has come a long way and is used in every area of the industry to solve many problems. The latest version C++20 will see programmers change the way they code as it brings a whole array of features enabling the quick deployment of applications. This book will get you up and running with using the STL in the best way possible. Beginning with new language features in C++20, this book will help you understand the language's mechanics and library features and offer insights into how they work. Unlike other books, the C++20 STL Cookbook takes an implementation-specific, problem-solution approach that will help you overcome hurdles quickly. You'll learn core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on real-world recipes. This book is a reference guide for using the C++ STL with its latest capabilities and exploring the cutting-edge features in functional programming and lambda expressions. By the end of the book C++20 book, you'll be able to leverage the latest C++ features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (13 chapters)

Customize a string class with char_traits

The string class is an alias of the basic_string class, with the signature:

class basic_string<char, std::char_traits<char>>;

The first template parameter provides the type of character. The second template parameter provides a character traits class, which provides basic character and string operations for the specified character type. We normally use the default char_traits<char> class.

We can modify the behavior of a string by providing our own custom character traits class.

How to do it…

In this recipe, we will create a character traits class for use with basic_string that will ignore casing for comparison purposes:

  • First, we'll need a function to convert characters to a common case. We'll use lowercase here, but it's an arbitrary choice. Uppercase would work just as well:
    constexpr char char_lower(const char& c) {
        if(c >= 'A' &amp...