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)

Make your iterators compatible with STL iterator traits

Many STL algorithms require iterators to conform to certain traits. Unfortunately, these requirements are inconsistent across compilers, systems, and C++ versions.

For our purposes, we'll use the class from the Create an iterable range recipe to illustrate the issue. You may find this makes more sense if you read that recipe before continuing.

In main(), if I add a call to the minmax_element() algorithm:

Seq<int> r{ 100, 110 };
auto [min_it, max_it] = minmax_element(r.begin(), r.end());
cout << format("{} - {}\n", *min_it, *max_it);

It does not compile. The error messages are vague, cryptic, and cascading, but if you look closely, you'll see that our iterator does not meet the requirements to be compatible with this algorithm.

Okay, let's fix that.

How to do it…

We need to make a few simple additions to our iterator to make it compatible with the algorithm. Our iterator...