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 Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.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

Changing cases and case-insensitive comparison


This is a pretty common task. We have two non-Unicode or ANSI character strings:

#include <string> 
std::string str1 = "Thanks for reading me!"; 
std::string str2 = "Thanks for reading ME!"; 

We need to compare them in a case-insensitive manner. There are a lot of methods to do that, let's take a look at Boost's.

Getting ready

Basic knowledge of std::string is all we need here.

How to do it...

Here are different ways to do case-insensitive comparisons:

  1. The most simple one is:
#include <boost/algorithm/string/predicate.hpp> 

const bool solution_1 = (
     boost::iequals(str1, str2)
);
  1. Using the Boost predicate and standard library method:
#include <boost/algorithm/string/compare.hpp> 
#include <algorithm> 

const bool solution_2 = (
    str1.size() == str2.size() && std::equal(
        str1.begin(),
        str1.end(),
        str2.begin(),
        boost::is_iequal()
    )
);
  1. Making a lowercase copy of both the strings:
...