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Modern C++ Programming Cookbook

Modern C++ Programming Cookbook

By : Marius Bancila
4 (7)
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Modern C++ Programming Cookbook

Modern C++ Programming Cookbook

4 (7)
By: Marius Bancila

Overview of this book

C++ is one of the most widely used programming languages. Fast, efficient, and flexible, it is used to solve many problems. The latest versions of C++ have seen programmers change the way they code, giving up on the old-fashioned C-style programming and adopting modern C++ instead. Beginning with the modern language features, each recipe addresses a specific problem, with a discussion that explains the solution and offers insight into how it works. You will learn major concepts about the core programming language as well as common tasks faced while building a wide variety of software. You will learn about concepts such as concurrency, performance, meta-programming, lambda expressions, regular expressions, testing, and many more in the form of recipes. These recipes will ensure you can make your applications robust and fast. By the end of the book, you will understand the newer aspects of C++11/14/17 and will be able to overcome tasks that are time-consuming or would break your stride while developing.
Table of Contents (13 chapters)
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Using std::optional to store optional values


Sometimes, it is useful to be able to store either a value or a null if a value is not available. A typical example for such a case is the return value of a function that may fail to produce a return value, but this failure is not an error. For instance, think of a function that finds and returns values from a dictionary by specifying a key. Not finding a value is a probable case and, therefore, the function would either return a Boolean (or an integer value, if more error codes are necessary) and have a reference argument to hold the return value or return a pointer (raw or smart pointer). In C++17, std::optional is a better alternative to these solutions. The class template std::optional is a template container for storing a value that may or may not exist. In this recipe, we will see how to use this container and what are its typical use cases.

Getting ready

The class template std::optional<T> was designed based on boost::optional and is...

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