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)

Merge sorted containers

The std::merge() algorithm takes two sorted sequences and creates a third merged and sorted sequence. This technique is often used as part of a merge sort, allowing very large amounts of data to be broken down into chunks, sorted separately, and merged into one sorted target.

How to do it…

For this recipe, we'll take two sorted vector containers and merge them into a third vector using std::merge().

  • We'll start with a simple function to print the contents of a container:
    void printc(const auto& c, string_view s = "") {
        if(s.size()) cout << format("{}: ", s);
        for(auto e : c) cout << format("{} ", e);
        cout << '\n';

We'll use this to print the source and destination sequences.

  • In the main() function, we'll declare our source vectors, along with the destination vector, and print...