To compile and run the examples in this chapter, you must have administrative access to a computer running Ubuntu 18.04 with a functional internet connection. Before running these examples, you must install the following:

sudo apt-get install build-essential git cmake

If this is installed on any operating system other than Ubuntu 18.04, then GCC 7.4 or higher and CMake 3.6 or higher will be required.

The noexcept specifier is used to tell the compiler whether a function may or may not throw a C++ exception. If a function is marked with the noexcept specifier, it is not allowed to throw an exception and, if it does, std::terminate() will be called when the exception is thrown. If the function doesn't have the noexcept specifier, exceptions can be thrown as normal.

In this recipe, we will explore how to use the noexcept specifier in your own code. This specifier is important because it is a contract between the API that you are creating and the user of the API. When the noexcept specifier is used, it tells the user of the API that they do not need to consider exceptions when using the API. It also tells the author that if they add the noexcept specifier to their API, they have to ensure that no exceptions are thrown, which, in some cases, requires...

The noexcept operator is a compile-time check that is used to ask the compiler whether a function is labeled noexcept or not. With C++17, this can be paired with a compile-time if statement (that is, an if statement that is evaluated at compile time and that can be used to add/remove code from an executable during compilation) to change the semantics of a program based on whether or not a function is allowed to throw an exception. 

In this recipe, we will explore how to use the noexcept operator in your own code. This operator is important because, in some cases, you may not know whether a function is capable of throwing an exception by simply looking at its definition. For example, if a function uses the noexcept specifier, your code might not be able to determine whether the function will throw, as you might not know—based on the function...

RAII is a programming principle that states that a resource is tied to the lifetime of the object that acquired the resource. RAII is a powerful feature of the C++ language that really helps to set C++ apart from C, helping to prevent resource leaks and general instability.

In this recipe, we will dive into how RAII works and how RAII can be used to ensure that C++ exceptions do not introduce resource leaks. RAII is a critical technology for any C++ application and should be used whenever possible.

Before beginning, please ensure that all of the technical requirements are met, including installing Ubuntu 18.04 or higher and running the following in a Terminal window:

> sudo apt-get install...

In this recipe, we will discuss the issues with C++ exceptions, specifically in regard to throwing exceptions within a class destructor, something that should be avoided at all costs. The lessons learned in this recipe are important because, unlike other functions, a C++ class destructor is marked as noexcept by default, which means that if you accidentally throw an exception inside a class destructor, your program will call std::terminate(), even though the destructor my not be overtly labeled noexcept.

Before beginning, please ensure that all of the technical requirements are met, including installing Ubuntu 18.04 or higher, and run the following...

In this recipe, you will learn how to easily create your own exception types. This is an important lesson to learn as, although C++ exceptions are easy to create yourself, some guidelines should be followed to ensure this is done safely.

Before beginning, please ensure that all of the technical requirements are met, including installing Ubuntu 18.04 or higher and running the following in a Terminal window:

> sudo apt-get install build-essential git cmake

This will ensure your operating system has the proper tools to compile and execute the examples in this recipe. Once this is complete, open a new Terminal. We will use this Terminal to download, compile, and run our...