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 Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.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

Passing function pointer in a variable


We are continuing with the previous example, and now we want to pass a pointer to a function in our process_integers() method. Shall we add an overload for just function pointers, or is there a more elegant way?

Getting ready

This recipe is continuing the previous one. You must read the previous recipe first.

How to do it...

Nothing needs to be done as boost::function<> is also constructible from the function pointers:

void my_ints_function(int i); 

int main() { 
    process_integers(&my_ints_function); 
}

How it works...

A pointer to my_ints_function will be stored inside the boost::function class, and calls to boost::function will be forwarded to the stored pointer.

There's more...

The Boost.Function library provides a good performance for pointers to functions, and it will not allocate memory on heap. Standard library std::function is also effective in storing function pointers. Since Boost 1.58, the Boost.Function library can store functions and...