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Modern C++ Programming Cookbook
Modern C++ Programming Cookbook

Modern C++ Programming Cookbook: Master C++ core language and standard library features, with over 100 recipes, updated to C++20 , Second Edition

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Modern C++ Programming Cookbook

Working with Numbers and Strings

Numbers and strings are the fundamental types of any programming language; all other types are based on or composed of these ones. Developers are confronted all the time with tasks such as converting between numbers and strings, parsing and formatting strings, and generating random numbers. This chapter is focused on providing useful recipes for these common tasks using modern C++ language and library features.

The recipes included in this chapter are as follows:

  • Converting between numeric and string types
  • Limits and other properties of numeric types
  • Generating pseudo-random numbers
  • Initializing all the bits of the internal state of a pseudo-random number generator
  • Creating cooked user-defined literals
  • Creating raw, user-defined literals
  • Using raw string literals to avoid escaping characters
  • Creating a library of string helpers
  • Verifying the format of a string using regular...

Converting between numeric and string types

Converting between number and string types is a ubiquitous operation. Prior to C++11, there was little support for converting numbers to strings and back, so developers had to resort mostly to type-unsafe functions, and they usually wrote their own utility functions in order to avoid writing the same code over and over again. With C++11, the standard library provides utility functions for converting between numbers and strings. In this recipe, you will learn how to convert between numbers and strings and the other way around using modern C++ standard functions.

Getting ready

All the utility functions mentioned in this recipe are available in the <string> header.

How to do it...

Use the following standard conversion functions when you need to convert between numbers and strings:

  • To convert from an integer or floating-point type to a string type, use std::to_string() or std::to_wstring(), as shown in the...

Limits and other properties of numeric types

Sometimes, it is necessary to know and use the minimum and maximum values that can be represented with a numeric type, such as char, int, or double. Many developers use standard C macros for this, such as CHAR_MIN/CHAR_MAX, INT_MIN/INT_MAX, and DBL_MIN/DBL_MAX. C++ provides a class template called numeric_limits with specializations for every numeric type that enables you to query the minimum and maximum value of a type. However, numeric_limits is not limited to that functionality, and offers additional constants for type property querying, such as whether a type is signed or not, how many bits it needs for representing its values, whether it can represent infinity for floating-point types, and many others. Prior to C++11, the use of numeric_limits<T> was limited because it could not be used in places where constants were needed (examples include the size of arrays and switch cases). Due to that, developers preferred to...

Generating pseudo-random numbers

Generating random numbers is necessary for a large variety of applications, from games to cryptography, from sampling to forecasting. However, the term random numbers is not actually correct, as the generation of numbers through mathematical formulas is deterministic and does not produce true random numbers, but numbers that look random and are called pseudo-random. True randomness can only be achieved through hardware devices, based on physical processes, and even that can be challenged as we may consider even the universe to be actually deterministic. Modern C++ provides support for generating pseudo-random numbers through a pseudo-random number library containing number generators and distributions. Theoretically, it can also produce true random numbers, but in practice, those could actually be only pseudo-random.

Getting ready

In this recipe, we'll discuss the standard support for generating pseudo-random numbers. Understanding...

Initializing all bits of internal state of a pseudo-random number generator

In the previous recipe, we looked at the pseudo-random number library, along with its components, and how it can be used to produce numbers in different statistical distributions. One important factor that was overlooked in that recipe is the proper initialization of the pseudo-random number generators.

With careful analysis (that is beyond the purpose of this recipe or this book), it can be shown that the Mersenne twister engine has a bias toward producing some values repeatedly and omitting others, thus generating numbers not in a uniform distribution, but rather in a binomial or Poisson distribution. In this recipe, you will learn how to initialize a generator in order to produce pseudo-random numbers with a true uniform distribution.

Getting ready

You should read the previous recipe, Generating pseudo-random numbers, to get an overview of what the pseudo-random number library offers...

Creating cooked user-defined literals

Literals are constants of built-in types (numerical, Boolean, character, character string, and pointer) that cannot be altered in a program. The language defines a series of prefixes and suffixes to specify literals (and the prefix/suffix is actually part of the literal). C++11 allows us to create user-defined literals by defining functions called literal operators, which introduce suffixes for specifying literals. These work only with numerical character and character string types.

This opens the possibility of defining both standard literals in future versions and allows developers to create their own literals. In this recipe, we will learn how to create our own cooked literals.

Getting ready

User-defined literals can have two forms: raw and cooked. Raw literals are not processed by the compiler, whereas cooked literals are values processed by the compiler (examples can include handling escape sequences in a character string or...

Creating raw user-defined literals

In the previous recipe, we looked at the way C++11 allows library implementers and developers to create user-defined literals and the user-defined literals available in the C++14 standard. However, user-defined literals have two forms: a cooked form, where the literal value is processed by the compiler before being supplied to the literal operator, and a raw form, in which the literal is not processed by the compiler before being supplied to the literal operator. The latter is only available for integral and floating-point types. Raw literals are useful for altering the compiler's normal behavior. For instance, a sequence such as 3.1415926 is interpreted by the compiler as a floating-point value, but with the use of a raw user-defined literal, it could be interpreted as a user-defined decimal value. In this recipe, we will look at creating raw user-defined literals.

Getting ready

Before continuing with this recipe, it is strongly recommended...

Using raw string literals to avoid escaping characters

Strings may contain special characters, such as non-printable characters (newline, horizontal and vertical tab, and so on), string and character delimiters (double and single quotes), or arbitrary octal, hexadecimal, or Unicode values. These special characters are introduced with an escape sequence that starts with a backslash, followed by either the character (examples include ' and "), its designated letter (examples include n for a new line, t for a horizontal tab), or its value (examples include octal 050, hexadecimal XF7, or Unicode U16F0). As a result, the backslash character itself has to be escaped with another backslash character. This leads to more complicated literal strings that can be hard to read.

To avoid escaping characters, C++11 introduced raw string literals that do not process escape sequences. In this recipe, you will learn how to use the various forms of raw string literals.

Getting...

Creating a library of string helpers

The string types from the standard library are a general-purpose implementation that lacks many helpful methods, such as changing the case, trimming, splitting, and others that may address different developer needs. Third-party libraries that provide rich sets of string functionalities exist. However, in this recipe, we will look at implementing several simple, yet helpful, methods you may often need in practice. The purpose is rather to see how string methods and standard general algorithms can be used for manipulating strings, but also to have a reference to reusable code that can be used in your applications.

In this recipe, we will implement a small library of string utilities that will provide functions for the following:

  • Changing a string into lowercase or uppercase
  • Reversing a string
  • Trimming white spaces from the beginning and/or the end of the string
  • Trimming a specific set of characters from the beginning...

Verifying the format of a string using regular expressions

Regular expressions are a language intended for performing pattern matching and replacements in texts. C++11 provides support for regular expressions within the standard library through a set of classes, algorithms, and iterators available in the header <regex>. In this recipe, we will learn how regular expressions can be used to verify that a string matches a pattern (examples can include verifying an email or IP address formats).

Getting ready

Throughout this recipe, we will explain, whenever necessary, the details of the regular expressions that we use. However, you should have at least some basic knowledge of regular expressions in order to use the C++ standard library for regular expressions. A description of regular expressions syntax and standards is beyond the purpose of this book; if you are not familiar with regular expressions, it is recommended that you read more about them before continuing...

Parsing the content of a string using regular expressions

In the previous recipe, we looked at how to use std::regex_match() to verify that the content of a string matches a particular format. The library provides another algorithm called std::regex_search() that matches a regular expression against any part of a string, and not only the entire string, as regex_match() does. This function, however, does not allow us to search through all the occurrences of a regular expression in an input string. For this purpose, we need to use one of the iterator classes available in the library.

In this recipe, you will learn how to parse the content of a string using regular expressions. For this purpose, we will consider the problem of parsing a text file containing name-value pairs. Each such pair is defined on a different line and has the format name = value, but lines starting with a # represent comments and must be ignored. The following is an example:

#remove # to uncomment...

Replacing the content of a string using regular expressions

In the previous two recipes, we looked at how to match a regular expression on a string or a part of a string and iterate through matches and submatches. The regular expression library also supports text replacement based on regular expressions. In this recipe, we will learn how to use std::regex_replace() to perform such text transformations.

Getting ready

For general information about regular expressions support in C++11, refer to the Verifying the format of a string using regular expressions recipe, earlier in this chapter.

How to do it...

In order to perform text transformations using regular expressions, you should perform the following:

  • Include <regex> and <string> and the namespace std::string_literals for C++14 standard user-defined literals for strings:
    #include <regex>
    #include <string>
    using namespace std::string_literals;
    
  • Use the std...

Using string_view instead of constant string references

When working with strings, temporary objects are created all the time, even if you might not be really aware of it. Many times, these temporary objects are irrelevant and only serve the purpose of copying data from one place to another (for example, from a function to its caller). This represents a performance issue because they require memory allocation and data copying, which should be avoided. For this purpose, the C++17 standard provides a new string class template called std::basic_string_view that represents a non-owning constant reference to a string (that is, a sequence of characters). In this recipe, you will learn when and how you should use this class.

Getting ready

The string_view class is available in the namespace std in the string_view header.

How to do it...

You should use std::string_view to pass a parameter to a function (or return a value from a function), instead of std::string const...

Formatting text with std::format

The C++ language has two ways of formatting text: the printf family of functions and the I/O streams library. The printf functions are inherited from C and provide a separation of the formatting text and the arguments. The streams library provides safety and extensibility and is usually recommended over printf functions, but is, in general, slower. The C++20 standard proposes a new formatting library alternative for output formatting, which is similar in form to printf but safe and extensible and is intended to complement the existing streams library. In this recipe, we will learn how to use the new functionalities instead of the printf functions or the streams library.

Getting ready

The new formatting library is available in the header <format>. You must include this header for the following samples to work.

How to do it...

The std::format() function formats its arguments according to the provided formatting string. You can use...

Using std::format with user-defined types

The C++20 formatting library is a modern alternative to using printf-like functions or the I/O streams library, which it actually complements. Although the standard provides default formatting for basic types, such as integral and floating-point types, bool, character types, strings, and chrono types, the user can create custom specialization for user-defined types. In this recipe, we will learn how to do that.

Getting ready

You should read the previous recipe, Formatting text with std::format, to familiarize yourself with the formatting library.

In the examples that we'll be showing here, we will use the following class:

struct employee
{
   int         id;
   std::string firstName;
   std::string lastName;
};

In the next section, we'll introduce the necessary steps to implement to enable text formatting using std::format() for user-defined types.

How to do it...

To enable formatting using the new...

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Key benefits

  • Explore the latest language and library features of C++20 such as modules, coroutines, concepts, and ranges
  • Shed new light on the core concepts in C++ programming, including functions, algorithms, threading, and concurrency, through practical self-contained recipes
  • Leverage C++ features like smart pointers, move semantics, constexpr, and more for increased robustness and performance

Description

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.

Who is this book for?

The book is designed for entry- or medium-level C++ programmers who have a basic knowledge of C++ and want to master the language and become prolific modern C++ developers. Experienced C++ programmers can leverage this book to strengthen their command of C++ and find a good reference to many language and library features of C++11/14/17/20.

What you will learn

  • Understand the new C++20 language and library features and the problems they solve
  • Become skilled at using the standard support for threading and concurrency for daily tasks
  • Leverage the standard library and work with containers, algorithms, and iterators
  • Solve text searching and replacement problems using regular expressions
  • Work with different types of strings and learn the various aspects of compilation
  • Take advantage of the file system library to work with files and directories
  • Implement various useful patterns and idioms
  • Explore the widely used testing frameworks for C++
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Table of Contents

15 Chapters
Learning Modern Core Language Features Chevron down icon Chevron up icon
Working with Numbers and Strings Chevron down icon Chevron up icon
Exploring Functions Chevron down icon Chevron up icon
Preprocessing and Compilation Chevron down icon Chevron up icon
Standard Library Containers, Algorithms, and Iterators Chevron down icon Chevron up icon
General-Purpose Utilities Chevron down icon Chevron up icon
Working with Files and Streams Chevron down icon Chevron up icon
Leveraging Threading and Concurrency Chevron down icon Chevron up icon
Robustness and Performance Chevron down icon Chevron up icon
Implementing Patterns and Idioms Chevron down icon Chevron up icon
Exploring Testing Frameworks Chevron down icon Chevron up icon
C Plus Plus 20 Core Features Chevron down icon Chevron up icon
Bibliography Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
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José Juan Ojeda Feb 19, 2024
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Y. Arazi Oct 16, 2020
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One of the best Modern C++ cookbooks out there. Period!The book is full of great ideas, modern C++ recipes, written very well By Marius Bancila. I suggest you also look at his other books. There are very well written. Some of the chapters are not that easy and kinda very advanced. So I found this book suitable for all levels. Some chapters are more for beginners and it goes all the way to super advanced.It has C++20 which is why I also bought the 2nd edition. Not a lot of books with 20 out there these days and I was waiting for Marius to publish a book about C++20.Overall I think this is a _great_ value for your money. You'll find it useful textbook when you deal with Modern C++.
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Ryan Riley Oct 20, 2020
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The format of the book along with the code examples allows you to understand and start implementingnew concepts in your program immediately.Provides those little details that really matter. Like telling you the header file you need, or that a function that is being used comes from a name space, or what the symbols ?!= are actually doingMakes a great reference. Saves time because you can just look in the book instead reading those 5 to 10 pages that your google search returned.
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Amazon Customer May 15, 2021
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This is an excellent book if you're already familiar with the ropes of C/C++, and wish to further develop your set of C++ skills. I'm a big fan of how it is organized much like a recipe book. It groups together topics into chapters, each of which are relatively distinct from one another, so you don't have to progress through the book in order. If you just want to learn about some topics in File I/O, then you can skip to that chapter; likewise, you can move to the chapter on Concurrency if that's what you want to learn.I also really like how each topic within a chapter is covered. The book introduces the topic, describing what prerequisite knowledge you might need, then shows you code on how to perform some task. It then takes time to explain how that task works behind the scenes, and then provides references to other sections of the book that are helpful if you want to build upon your new knowledge of this topic. This consistent layout makes it easy to look up and find whatever information about a topic that you need.I find the book's composition to be particularly useful - it's designed to be digestible so that you can check out a specific chapter based on your needs and interests. The book does make clear that it's not quite for beginners; you want to have a basic understanding of functions, classes, templates, macros, etc. before you dive into this book. But if you feel comfortable with C/C++ already, then this book does a great job of providing you with plenty of information to further strengthen your understanding and expertise of C++!
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vishal kaushik Jun 13, 2021
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I was given the privilege to review this book by one of my friend and ai would like to admit this is one of the best book I have come across recently on modern C++.This book is definitely not for beginners but if you have few years of experience with modern c++ and trying to learn to best utilize the c++ modern features , you will start loving this book after reading first chapter two chapters itself.I love the recipes given in this book to explain modern c++ concepts like pimpl and named parameters and attorney client with factory pattern. These are just few examples but the book contains really good recipes to utilize modern language features.I really appreciate the author to also include testing frameworks like google test and boost test since unit testing your code is another important factor in any language.I would highly recommend this book to users who are looking to learn and implement modern c++ features in their projects , i am sure this book will tremendously help in that.
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Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela