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)

Store different types with std::variant

Introduced with C++17, the std::variant class may hold different values, one at a time, where each value must fit in the same allocated memory space. It's useful for holding alternative types for use in a single context.

Differences from the primitive union structure

The variant class is a tagged union. It differs from the primitive union structure in that only one type may be in effect at a time.

The primitive union type, inherited from C, is a structure where the same datum may be accessed as different types. For example:

union ipv4 {
    struct {
        uint8_t a; uint8_t b; uint8_t c; uint8_t d;
    } quad;
    uint32_t int32;
} addr;
addr.int32 = 0x2A05A8C0;
cout << format("ip addr dotted quad: {}.{}.{}.{}\n", 
    addr.quad.a, addr.quad.b, addr.quad.c, addr.quad.d);
cout << format...