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Home > Programming > Programming Language > Advanced C++
Advanced C++
Advanced C++

Advanced C++: Master the technique of confidently writing robust C++ code

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Advanced C++

2A. No Ducks Allowed – Types and Deduction

Learning Objectives

By the end of this chapter, you will be able to:

  • Implement your own classes that behave like built-in types
  • Implement classes that control which functions the compiler creates (Rule of Zero/Rule of Five)
  • Develop functions using auto variables, like you always have
  • Implement classes and functions by making use of strong typing to write safer code

This chapter will give you a good grounding in the C++ type system and allow you to write your own types that work in that system.

Introduction

C++ is a strongly typed, statically typed language. The compiler uses type information related to the variables that are used and the context in which they are used to detect and prevent certain classes of programming errors. This means that every object has a type and that type does not change, ever. In contrast, dynamically typed languages such as Python and PHP defer this type checking until runtime (also known as late binding), and the type of a variable may change during the execution of the application. These languages use the duck test instead of the variables type – that is, "if it walks and talks like a duck, then it must be a duck." Statically typed languages such as C++ rely on the type to determine whether a variable can be used for a given purpose, while dynamically typed languages rely on the presence of certain methods and properties to determine its suitability.

C++ was originally described as "C with classes". What does this mean? Basically...

C++ Types

As a strongly and, statically typed language, C++ provides several fundamental types and the ability to define their own types with as much or as little functionality as needed to solve the problem at hand. This section will start by introducing the fundamental types, initializing them, declaring a variable, and associating a type with it. We will then explore how to declare and define a new type.

C++ Fundamental Types

C++ includes several fundamental types, or built-in types. The C++ standard defines the minimum size in memory for each type and their relative sizes. The compiler recognizes these fundamental types and has built-in rules that define what operations can and cannot be performed on them. There are also rules for implicit conversions between types; for example, conversion from an int type to a float type.

Note

See the Fundamental Types section at https://en.cppreference.com/w/cpp/language/types for a brief description of all the built-in types.

C++ Literals

C++ literals are...

Specifying Types – Variables

As C++ is a statically typed language, it is necessary to specify the type of a variable when it is declared. When you declare a function, it is necessary to specify the return type and the types of arguments that are being passed to it. There are two choices for specifying the type to a variable when you declare it:

  • Explicitly: You, as the programmer, are dictating exactly what the type is.
  • Implicitly (using auto): You are telling the compiler to look at the value that was used to initialize the variable and determine its type. This is known as (auto) type deduction.

The general form of declaration for a scalar variable is one of the following:

type-specifier var;                       // 1. Default-initialized variable

type-specifier var = init-value;          // 2. Assignment initialized...

Specifying Types – Functions

Now that we can declare a variable to be of a certain type, we need to do something with those variables. In C++, we do things by calling a function. A function is a sequence of statements that deliver an outcome. That outcome could be a mathematical calculation (for example, an exponent) that is then sent to a file or written to a Terminal.

Functions allow us to break our solution into sequences of statements that are easier to manage and understand. As we write these packaged statements, we can reuse them where it makes sense. If we need it to operate differently based on the context, then we pass in an argument. If it returns a result, then the function needs a return type.

As C++ is a strongly typed language, we need to specify the types related to the functions that we implement – the type of value returned by the function (including no return) and the type of argument(s) that are passed to it, if any.

The following is a typical hello world...

Creating User Types

The great thing about C++ is that you can create your own types using struct, class, enum, or union and the compiler will treat it as a fundamental type throughout the code. In this section, we will explore creating our own type and the methods that we need to write to manipulate it, as well as some methods that the compiler will create for us.

Enumerations

The simplest user-defined type is the enumeration. Enumerations got an overhaul in C++11 to make them even more type-safe, so we have to consider two different declaration syntaxes. Before we look at how to declare them, let's figure out why we need them. Consider the following code:

int check_file(const char* name)

{

  FILE* fptr{fopen(name,"r")};

  if ( fptr == nullptr)

    return -1;

  char buffer[120];

  auto numberRead = fread(buffer, 1, 30, fptr);

  fclose(fptr);

  if (numberRead != 30)

    return -2;

 ...

Summary

In this chapter, we learned about types in C++. Firstly, we touched on the built-in types and then learned how to create our own types that behave like the built-in types. We learned how to declare and initialize variables, got a glimpse of what the compiler generates from the source, where it puts variables, how the linker puts it together, and then what that looks like in the computer's memory. We learned some of the C++ tribal wisdom around the Rule of Zero and the Rule of Five. These form the building blocks of C++. In the next chapter, we will look at creating functions and classes with C++ templates and explore further type deduction as it applies to templates.

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Key benefits

  • Explore C++ concepts through descriptive graphics and interactive exercises
  • Learn how to keep your development bug-free with testing and debugging
  • Discover various techniques to optimize your code

Description

C++ is one of the most widely used programming languages and is applied in a variety of domains, right from gaming to graphical user interface (GUI) programming and even operating systems. If you're looking to expand your career opportunities, mastering the advanced features of C++ is key. The book begins with advanced C++ concepts by helping you decipher the sophisticated C++ type system and understand how various stages of compilation convert source code to object code. You'll then learn how to recognize the tools that need to be used in order to control the flow of execution, capture data, and pass data around. By creating small models, you'll even discover how to use advanced lambdas and captures and express common API design patterns in C++. As you cover later chapters, you'll explore ways to optimize your code by learning about memory alignment, cache access, and the time a program takes to run. The concluding chapter will help you to maximize performance by understanding modern CPU branch prediction and how to make your code cache-friendly. By the end of this book, you'll have developed programming skills that will set you apart from other C++ programmers.

Who is this book for?

If you have worked in C++ but want to learn how to make the most of this language, especially for large projects, this book is for you. A general understanding of programming and knowledge of using an editor to produce code files in project directories is a must. Some experience with strongly typed languages, such as C and C++, is also recommended.

What you will learn

  • Delve into the anatomy and workflow of C++
  • Study the pros and cons of different approaches to coding in C++
  • Test, run, and debug your programs
  • Link object files as a dynamic library
  • Use templates, SFINAE, constexpr if expressions and variadic templates
  • Apply best practice to resource management
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Length: 762 pages
Edition : 1st
Language : English
ISBN-13 : 9781838821135
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Concepts :
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Product Details

Publication date : Oct 31, 2019
Length: 762 pages
Edition : 1st
Language : English
ISBN-13 : 9781838821135
Category :
Programming
Languages :
C++
Concepts :
Programming Language

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Table of Contents

9 Chapters
1. Anatomy of Portable C++ Software Chevron down icon Chevron up icon
1. Anatomy of Portable C++ Software
Introduction
Managing C++ Projects
Importing a CMake Project into Eclipse CDT
Unit Testing
Understanding Compilation, Linking, and Object File Contents
Debugging C++ Code
Writing Readable Code
Summary
2A. No Ducks Allowed – Types and Deduction Chevron down icon Chevron up icon
2A. No Ducks Allowed – Types and Deduction
Introduction
C++ Types
Specifying Types – Variables
Specifying Types – Functions
Creating User Types
Summary
2B. No Ducks Allowed – Templates and Deduction Chevron down icon Chevron up icon
2B. No Ducks Allowed – Templates and Deduction
Introduction
Inheritance, Polymorphism, and Interfaces
Visibility, Lifetime, and Access
Templates – Generic Programming
Type Aliases – typedef and using
Templates – More than Generic Programming
Class Templates
Summary
3. No Leaks Allowed - Exceptions and Resources Chevron down icon Chevron up icon
3. No Leaks Allowed - Exceptions and Resources
Introduction
Exceptions in C++
Resource Management (in an Exceptional World)
Summary
4. Separation of Concerns - Software Architecture, Functions, and Variadic Templates Chevron down icon Chevron up icon
4. Separation of Concerns - Software Architecture, Functions, and Variadic Templates
Introduction
Function Objects and Lambda Expressions
Variadic Templates
Summary
5. The Philosophers' Dinner – Threads and Concurrency Chevron down icon Chevron up icon
5. The Philosophers' Dinner – Threads and Concurrency
Introduction
Synchronous, Asynchronous, and Threaded Execution
Review Synchronization, Data Hazards, and Race Conditions
Futures, Promises, and Async
Summary
6. Streams and I/O Chevron down icon Chevron up icon
6. Streams and I/O
Introduction
Summary
7. Everybody Falls, It's How You Get Back Up – Testing and Debugging Chevron down icon Chevron up icon
7. Everybody Falls, It's How You Get Back Up – Testing and Debugging
Introduction
Unit Testing and Mock Testing
Summary
8. Need for Speed – Performance and Optimization Chevron down icon Chevron up icon
8. Need for Speed – Performance and Optimization
Introduction
Performance Measurement
Runtime Profiling
Optimization Strategies
Further Optimizations
Cache Friendly Code
Summary

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Christian Albaret Feb 16, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
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. The book shows many examples and steps through the aspects important to software engineering: seeting up an environment and a workflow, standard C++ concepts, focus on how to implement advanced software concepts with C++.
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The chapter on writing readable has the most unreadable code I can imagine.Maybe it’s just the kindle version, but all the code is left justified with no indentation at all.This was the first chapter I read, and just deleted it from my device.
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About the 5 authors

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Profile icon Gazihan Alankus
Gazihan Alankus
Gazihan Alankus holds a PhD in computer science from Washington University in St. Louis. Currently, he is an assistant professor at the Izmir University of Economics in Turkey. He teaches and conducts research on game development, mobile application development, and human-computer interaction. He is a Google developer expert in Dart and develops Flutter applications with his students in his company Gbot, which he founded in 2019.
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Profile icon Brian Price
Brian Price
Brian Price has over 30 years experience working in a variety of languages, projects, and industries, including over 20 years' experience in C++. He was worked on power station simulators, SCADA systems, and medical devices. He is currently crafting software in C++, CMake, and Python for a next-generation medical device. He enjoys solving puzzles and the Euler project in a variety of languages.
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Profile icon Vivek Nagarajan
Vivek Nagarajan
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Vivek Nagarajan is a self-taught programmer who started out in the 1980s on 8-bit systems. He has worked on a large number of software projects and has 14 years of professional experience with C++. Aside from this, he has worked on a wide variety of languages and frameworks across the years. He is an amateur powerlifter, DIY enthusiast, and motorcycle racer. He currently works as an independent software consultant.
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Profile icon Rakesh Mane
Rakesh Mane
Rakesh Mane has over 18 years of experience in the software industry. He has worked with proficient programmers from a variety of regions such as India, the US, and Singapore. He has mostly worked in C++, Python, shell scripting, and database. In his spare time, he likes to listen to music and travel. Also, he likes to play with, experiment with, and break things using software tools and code.
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Profile icon Olena Lizina
Olena Lizina
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Olena Lizina is a software developer with 5 years experience in C++. She has practical knowledge of developing systems for monitoring and managing remote computers with a lot of users for an international product company. For the last 4 years, she has been working for international outsourcing companies on automotive projects for well-known automotive concerns. She has been participating in the development of complex and high-performance applications on different projects, such as HMI (Human Machine Interface), navigation, and applications for work with sensors.
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What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
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