Book Image

Modern C++ Programming Cookbook - Second Edition

By : Marius Bancila
5 (1)
Book Image

Modern C++ Programming Cookbook - Second Edition

5 (1)
By: Marius Bancila

Overview of this book

C++ has come a long way to be one of the most widely used general-purpose languages that is fast, efficient, and high-performance at its core. The updated second edition of Modern C++ Programming Cookbook addresses the latest features of C++20, such as modules, concepts, coroutines, and the many additions to the standard library, including ranges and text formatting. The book is organized in the form of practical recipes covering a wide range of problems faced by modern developers. The book also delves into the details of all the core concepts in modern C++ programming, such as functions and classes, iterators and algorithms, streams and the file system, threading and concurrency, smart pointers and move semantics, and many others. It goes into the performance aspects of programming in depth, teaching developers how to write fast and lean code with the help of best practices. Furthermore, the book explores useful patterns and delves into the implementation of many idioms, including pimpl, named parameter, and attorney-client, teaching techniques such as avoiding repetition with the factory pattern. There is also a chapter dedicated to unit testing, where you are introduced to three of the most widely used libraries for C++: Boost.Test, Google Test, and Catch2. By the end of the book, you will be able to effectively leverage the features and techniques of C++11/14/17/20 programming to enhance the performance, scalability, and efficiency of your applications.
Table of Contents (16 chapters)
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Implementing the higher-order functions map and fold

Throughout the preceding recipes in this book, we have used the general-purpose algorithms std::transform() and std::accumulate() in several examples, such as for implementing string utilities to create uppercase or lowercase copies of a string or for summing the values of a range. These are basically implementations of higher-order functions, map and fold. A higher-order function is a function that takes one or more other functions as arguments and applies them to a range (a list, vector, map, tree, and so on), thus producing either a new range or a value. In this recipe, we will learn how to implement the map and fold functions so that they work with C++ standard containers.

Getting ready

Map is a higher-order function that applies a function to the elements of a range and returns a new range in the same order.

Fold is a higher-order function that applies a combining function to the elements of the range...