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)

Iterate objects of unknown length with a sentinel

Some objects don't have a specific length. To know their length, you need to iterate through all their elements. For example, elsewhere in this chapter we've seen a generator that doesn't have a specific length. A more common example would be a C-string.

A C-string is a primitive C-array of characters, terminated with a null '\0' value.

Figure 4.5 – A C-string with its null terminator

We use C-strings all the time, even if we don't realize it. Any literal string in C/C++ is a C-string:

std::string s = "string";

Here, the STL string s is initialized with a literal string. The literal string is a C-string. If we look at the individual characters in hexadecimal, we'll see the null terminator:

for (char c : "string") {
    std::cout << format("{:02x} ", c);

The word "string" has six letters...