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Learning Boost C++

You're reading from   Learning Boost C++ Solve practical programming problems using powerful, portable, and expressive libraries from Boost

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Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781783551217
Length 558 pages
Edition 1st Edition
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Author (1):
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Arindam Mukherjee Arindam Mukherjee
Author Profile Icon Arindam Mukherjee
Arindam Mukherjee
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Table of Contents (14) Chapters Close

Preface 1. Introducing Boost FREE CHAPTER 2. The First Brush with Boost's Utilities 3. Memory Management and Exception Safety 4. Working with Strings 5. Effective Data Structures beyond STL 6. Bimap and Multi-index Containers 7. Higher Order and Compile-time Programming 8. Date and Time Libraries 9. Files, Directories, and IOStreams 10. Concurrency with Boost 11. Network Programming Using Boost Asio A. C++11 Language Features Emulation Index

Higher order programming with Boost


Consider a type Book with three string fields: the ISBN, title, and author (for our purposes, assume that there is only one author). Here is how we can choose to define this type:

 1 struct Book
 2 {
 3   Book(const std::string& id,
 4        const std::string& name,
 5        const std::string& auth)
 6         : isbn(id), title(name), author(auth)
 7   {}
 8
 9   std::string isbn;
10   std::string title;
11   std::string author;
12 };
13
14 bool operator< (const Book& lhs, const Book& rhs)
12 {  return lhs.isbn < rhs.isbn;  }

It is a struct with three fields and a constructor that initializes these three fields. The isbn field uniquely identifies the book and therefore is used to define an ordering of Book objects, using the overloaded operator< (line 14).

Now imagine that we have a list of these Book objects in a std::vector, and we want to sort these books. Thanks to the overloaded operator<, we can easily sort them using...

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