Book Image

Boost C++ Application Development Cookbook - Second Edition

By : Anton Polukhin Alekseevic
Book Image

Boost C++ Application Development Cookbook - Second Edition

By: Anton Polukhin Alekseevic

Overview of this book

If you want to take advantage of the real power of Boost and C++ and avoid the confusion about which library to use in which situation, then this book is for you. Beginning with the basics of Boost C++, you will move on to learn how the Boost libraries simplify application development. You will learn to convert data such as string to numbers, numbers to string, numbers to numbers and more. Managing resources will become a piece of cake. You’ll see what kind of work can be done at compile time and what Boost containers can do. You will learn everything for the development of high quality fast and portable applications. Write a program once and then you can use it on Linux, Windows, MacOS, Android operating systems. From manipulating images to graphs, directories, timers, files, networking – everyone will find an interesting topic. Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Disabling function template usage for real types


We continue working with Boost metaprogramming libraries. In the previous recipe, we saw how to use enable_if_c with classes; now it is time to take a look at its usage in template functions.

Imagine that, in your project, you have a template function that works with all the available types:

template <class T> 
T process_data(const T& v1, const T& v2, const T& v3);

That function exist for a long time. You have written a lot of code that uses it. Suddenly, you came up with an optimized version of the process_data function but only for types that do have an T::operator+=(const T&):

template <class T> 
T process_data_plus_assign(const T& v1, const T& v2, const T& v3);

You've got a huge code base and it may take months to manually change process_data to the process_data_plus_assign for types that have the right operators. So, you do not want to change the already written code. Instead, you want to force the compiler...