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 Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.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

Storing a few elements in a sequence container


For the past two decades, C++ programmers were using std::vector as a default sequence container. It is a fast container that does not do a lot of allocations, stores elements in a CPU cache friendly way and because container stores the elements contiguously std::vector::data() like functions allows to inter-operate with pure C functions.

But, we want more! There are cases when we do know the typical elements count to store in the vector, and we need to improve the performance of the vector by totally eliminating the memory allocations for that case.

Imagine that we are writing a high performance system for processing bank transactions. Transaction is a sequence of operations that must all succeed or fail if at least one of the operations failed. We know that the 99% of transactions consist of 8 or less operations and wish to speed up things:

#include <vector>

class operation;

template <class T>
void execute_operations(const T&amp...