Book Image

Modern C++ Programming Cookbook - Second Edition

By : Marius Bancila
Book Image

Modern C++ Programming Cookbook - Second Edition

By: Marius Bancila

Overview of this book

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.
Table of Contents (16 chapters)
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Implementing the named parameter idiom

C++ supports only positional parameters, which means arguments are passed to a function based on the parameter's position. Other languages also support named parameters – that is, they specify parameter names when making a call and invoking arguments. This is particularly useful with parameters that have default values. A function may have parameters with default values, although they always appear after all the non-defaulted parameters.

However, if you want to provide values for only some of the defaulted parameters, there is no way to do this without providing arguments for the parameters that are positioned before them in the function parameters list.

A technique called the named parameter idiom provides a method to emulate named parameters and help solve this problem. We will explore this technique in this recipe.

Getting ready

To exemplify the named parameter idiom, we will use the control class...