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Manipulating Functions in Functional Programming

In the previous chapter, we talked about modern C++ in depth, especially about the new feature in C++11--the Lambda expression. As we discussed earlier, the Lambda expression is useful in simplifying function notation. Thus, in this chapter, we will apply the power of the Lambda expression again, which will be used in functional code, especially when we talk about currying--the technique to split and reduce the current function.

In this chapter, we will discuss the following topics:

Applying the first-class function and higher-order function so that our functions can not only be invoked as a function, but also be assigned to any variable, pass a function, and return a function
Pure function, to avoid side effect in our function since it no longer contacts an outside state
Currying, as mentioned at the beginning of this chapter...

Key benefits

Modularize your applications and make them highly reusable and testable

Get familiar with complex concepts such as metaprogramming, concurrency, and immutability

A highly practical guide to building functional code in C++ filled with lots of examples and real-world use cases

Description

Functional programming allows developers to divide programs into smaller, reusable components that ease the creation, testing, and maintenance of software as a whole. Combined with the power of C++, you can develop robust and scalable applications that fulfill modern day software requirements. This book will help you discover all the C++ 17 features that can be applied to build software in a functional way. The book is divided into three modules—the first introduces the fundamentals of functional programming and how it is supported by modern C++. The second module explains how to efficiently implement C++ features such as pure functions and immutable states to build robust applications. The last module describes how to achieve concurrency and apply design patterns to enhance your application’s performance. Here, you will also learn to optimize code using metaprogramming in a functional way. By the end of the book, you will be familiar with the functional approach of programming and will be able to use these techniques on a daily basis.

What you will learn

• Get to know the difference between imperative and functional approaches

• See the use of first-class functions and pure functions in a functional style

• Discover various techniques to apply immutable state to avoid side effects

• Design a recursive algorithm effectively

• Create faster programs using lazy evaluation

• Structure code using design patterns to make the design process easier

• Use concurrency techniques to develop responsive software

• Learn how to use the C++ Standard Template Library and metaprogramming in a functional way to improve code optimization

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

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Christian Albaret Feb 16, 2024

I bought 5 books at once and could only give a fast glance at this one in order to write he review. It seems I have to write the reviews in order. I have been developping a lot in C++, and also used modern features of C++11 and above. The book discusses and shows examples on how to use these modern features. The advanced features are difficult to grasp: short examples don;t show enough, long examples are hard to read. The example in the book are fairly long, but they are given with detailed explanations.

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John Carter Sep 21, 2018

Very difficult to get to get to grips with initially but gets easier as you go.

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Hangzhou Tang May 31, 2018

It's not as perfect as I assume before. I found an error even in the beginning of the book. For example in page 11, the book shows "auto main ->int" which should be "auto main() -> int".

Mr. Moo May 09, 2018

I have quite a few Packt Publishing titles in my library and normally they are well written, concise and informative, but this is certainly not the case for this book, and to be honest the quality and content is shocking. As has been said in other reviews the grammar is terrible and the repetition of the example code a complete waste of space. But the book's does not live up to it's hype!From the back of the book “This book will help you discover all the C++17 features that can be applied to build software in a functional way.”, I read this and based my purchase decision on it, all very well you might think. But inside the book on page 40 there is the following paragraph:“The C++17 language plans to introduce two new features for the Lambda expression—they are capturing *this, which allows the expression to capture the enclosing object by copy, and the constexpr Lambda expressions, which allows us to use the result of the Lambda expressions and generate constexpr objects at compile time. However, since C++17 has not been released yet, we cannot try it for now.”Considering the quote above the book’s obviously been rushed to print and written prior to the availability of a C++ 17 compiler, so why Packt used the blurb they did I do not understand when they and the author clearly couldn’t produce what the back cover was offering.If I were you I’d keep your money and buy something else and if you want to know more about Functional programming with C++ there are plenty of articles available for free on the internet.

Jonathan Apr 22, 2018

Grammar is terrible. Code snippets are duplicated over and over again - concepts that can be shown in one or two lines are surrounded by 20 lines of boilerplate.Coming from functional programming languages, I was excited for what might be possible in c++ but was disappointed by the lack of depth in the book. I don't know enough about c++ to say that's the author's fault or the language's.

Learning C++ Functional Programming: Explore functional C++ with concepts like currying, metaprogramming and more

What do you get with Print?

Learning C++ Functional Programming

Manipulating Functions in Functional Programming

Applying the first-class function in all functions

Passing a function as another function's parameter

Getting acquainted with three functional techniques in the higher-order function

Avoiding the side effect with pure function

Reducing a multiple arguments function with currying

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Learning C++ Functional Programming: Explore functional C++ with concepts like currying, metaprogramming and more

What do you get with Print?

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What you will learn

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