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 Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.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

The fastest way to read files


All around the Internet, people are asking "What is the fastest way to read files?". Let's make our task for this recipe even harder: what is the fastest and portable way to read binary files?

Getting ready

Basic knowledge of C++ and the std::fstream is required for this recipe.

How to do it...

The technique from this recipe is widely used by applications critical to input and output performance. It's the fastest way to read files:

  1. We need to include two headers from the Boost.Interprocess library:
#include <boost/interprocess/file_mapping.hpp> 
#include <boost/interprocess/mapped_region.hpp> 
  1. Now, we need to open a file:
const boost::interprocess::mode_t mode = boost::interprocess::read_only; 
boost::interprocess::file_mapping fm(filename, mode); 
  1. The main part of this recipe is mapping all the files to memory:
boost::interprocess::mapped_region region(fm, mode, 0, 0);
  1. Getting a pointer to the data in the file:
const char* begin = static_cast<const char...