To get the most out of this book

The code presented in the book is available for download from https://github.com/PacktPublishing/Modern-Cpp-Cookbook-Second-Edition, although I encourage you to try writing all the samples by yourself. In order to compile them, you need VC++ 2019 16.7 on Windows and GCC 10.1 or Clang 12.0 on Linux and Mac. If you don't have the latest version of the compiler, or you want to try another compiler, you can use one that is available online.

Although there are various online platforms that you could use, I recommend Wandbox, available at https://wandbox.org/, and Compiler Explorer, available at https://godbolt.org/.

Download the example code files

You can download the example code files for this book from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at http://www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the on-screen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR / 7-Zip for Windows
• Zipeg / iZip / UnRarX for Mac
• 7-Zip / PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Modern-CPP-Programming-Cookbook-Second-Edition. We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781800208988_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. For example: "The geometry module was defined in a file called geometry.ixx/.cppm, although any file name would have had the same result."

A block of code is set as follows:

static std::map<
  std::string,
  std::function<std::unique_ptr<Image>()>> mapping
{
  { "bmp", []() {return std::make_unique<BitmapImage>(); } },
  { "png", []() {return std::make_unique<PngImage>(); } },
  { "jpg", []() {return std::make_unique<JpgImage>(); } }
};

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are highlighted:

static std::map<
  std::string,
  std::function<std::unique_ptr<Image>()>> mapping
{
  { "bmp", []() {return std::make_unique<BitmapImage>(); } },
  { "png", []() {return std::make_unique<PngImage>(); } },
  { "jpg", []() {return std::make_unique<JpgImage>(); } }
};

Any command-line input or output is written as follows:

running thread 140296854550272
running thread 140296846157568
running thread 140296837764864

Bold: Indicates a new term, an important word, or words that you see on the screen, for example, in menus or dialog boxes, also appear in the text like this. For example: "Select System info from the Administration panel."