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)

Format text with C++20's format library

C++20 introduces the new format() function, which returns a formatted representation of its arguments in a string. format() uses a Python-style formatting string, with concise syntax, type safety, and excellent performance.

The format() function takes a format string and a template, parameter pack, for its arguments:

template< class... Args >
string format(const string_view fmt, Args&&... args );

The format string uses curly braces {} as a placeholder for the formatted arguments:

const int a{47};
format("a is {}\n", a);


a is 47

It also uses the braces for format specifiers, for example:

format("Hex: {:x} Octal: {:o} Decimal {:d} \n", a, a, a);


Hex: 2f Octal: 57 Decimal 47

This recipe will show you how to use the format() function for some common string formatting solutions.


This chapter was developed using a preview release of the Microsoft Visual...