Book Image

Learning C++ Functional Programming

By : Wisnu Anggoro
5 (1)
Book Image

Learning C++ Functional Programming

5 (1)
By: Wisnu Anggoro

Overview of this book

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.
Table of Contents (15 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Executing the code in compile-time


As we discussed earlier, template metaprogramming will run the code in compile-time by creating a new code. Now, let's see how we can get the compile-time constant and generate a compile-time class in this section.

Getting a compile-time constant

To retrieve a compile-time constant, let's create a code that has the template for a Fibonacci algorithm in it. We will consume the template so the compiler will provide the value in compile time. The code should be as follows:

    /* fibonaccimeta.cpp */
    #include <iostream>

    using namespace std;

    // Defining Fibonacci template
    // to calculate the Fibonacci sequence
    template <int number>
    struct Fibonacci
    {
      enum
      {
        value =
            Fibonacci<number - 1>::value +
            Fibonacci<number - 2>::value
      };
    };

    // Defining template for
    // specific input value
    // 'number' = 1
    template <>
    struct Fibonacci<1...