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Modern C++ Programming Cookbook

Modern C++ Programming Cookbook

By : Marius Bancila
4 (7)
close
Modern C++ Programming Cookbook

Modern C++ Programming Cookbook

4 (7)
By: Marius Bancila

Overview of this book

C++ is one of the most widely used programming languages. Fast, efficient, and flexible, it is used to solve many problems. The latest versions of C++ have seen programmers change the way they code, giving up on the old-fashioned C-style programming and adopting modern C++ instead. Beginning with the modern language features, each recipe addresses a specific problem, with a discussion that explains the solution and offers insight into how it works. You will learn major concepts about the core programming language as well as common tasks faced while building a wide variety of software. You will learn about concepts such as concurrency, performance, meta-programming, lambda expressions, regular expressions, testing, and many more in the form of recipes. These recipes will ensure you can make your applications robust and fast. By the end of the book, you will understand the newer aspects of C++11/14/17 and will be able to overcome tasks that are time-consuming or would break your stride while developing.
Table of Contents (13 chapters)
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Generating hash values for custom types


The standard library provides several unordered associative containers: std::unordered_set, std::unordered_multiset, std::unordered_map, and std::unordered_map. These containers do not store their elements in a particular order; instead, they are grouped in buckets. The bucket an element belongs to depends on the hash value of the element. These standard containers use, by default, the std::hash class template to compute the hash value. The specialization for all basic types and also some library types is available. However, for custom types, you must specialize the class template yourself. This recipe will show you how to do that and also explain how a good hash value can be computed.

Getting ready

This recipe covers hashing functionalities from the standard library. You should be familiar with the concepts of hashes and hash functions.

For the examples in this recipe, we will use the following class:

    struct Item
    {
      int id;
      std::string...
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