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)

Use fold expressions for variadic tuples

The std::tuple class is essentially a more complex, and less convenient, struct. The interface for tuple is cumbersome, although class template argument deduction and structured binding have made it somewhat easier.

I tend to use struct before tuple for most applications, with one significant exception: the one real advantage of tuple is that it can be used with fold expressions in a variadic context.

Fold expressions

Designed to make it easier to expand a variadic parameter pack, fold expressions are a new feature with C++17. Prior to fold expressions, expanding a parameter pack required a recursive function:

template<typename T>
void f(T final) {
    cout << final << '\n';
template<typename T, typename... Args>
void f(T first, Args... args) {
    cout << first;
int main() {