Book Image

Modern C++ Programming Cookbook

By : Marius Bancila
Book Image

Modern C++ Programming Cookbook

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 (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Writing a function template with a variable number of arguments


It is sometimes useful to write functions with a variable number of arguments or classes with a variable number of members. Typical examples include functions such as printf that take a format and a variable number of arguments, or classes such as tuple. Before C++11, the former was possible only with the use of variadic macros (that enable writing only type-unsafe functions) and the latter was not possible at all. C++11 introduced variadic templates, which are templates with a variable number of arguments that make it possible to write both type-safe function templates with a variable number of arguments and also class templates with a variable number of members. In this recipe, we will look at writing function templates.

Getting ready

Functions with a variable number of arguments are called variadic functions. Function templates with a variable number of arguments are called variadic function templates. Knowledge of C++ variadic...