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 Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.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

Enabling function template usage for integral types


It's a common situation, when we have a class template that implements some functionality:

// Generic implementation.
template <class T> 
class data_processor { 
    double process(const T& v1, const T& v2, const T& v3); 
};

Now, imagine that we have two additional versions of that class, one for integral, and another for real types:

// Integral types optimized version. 
template <class T>
class data_processor_integral {
    typedef int fast_int_t;
    double process(fast_int_t v1, fast_int_t v2, fast_int_t v3);
}; 

// SSE optimized version for float types.
template <class T>
class data_processor_sse {
    double process(double v1, double v2, double v3);
};

Now the question: How to make the compiler to automatically choose the correct class for a specified type?

Getting ready

This recipe requires some knowledge of C++ templates.

How to do it...

We'll be using Boost.Core and Boost.TypeTraits to resolve the problem...