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## Chapter 10. Boost.Functional/Hash

### Daniel James

Copyright © 2005-2008 Daniel James

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

## Introduction

`boost::hash` is an implementation of the hash function object specified by the Draft Technical Report on C++ Library Extensions (TR1). It is the default hash function for Boost.Unordered, Boost.Intrusive's unordered associative containers, and Boost.MultiIndex's hash indicies and Boost.Bimap's `unordered_set_of`.

As it is compliant with TR1, it will work with:

- integers
- floats
- pointers
- strings

It also implements the extension proposed by Peter Dimov in issue 6.18 of the Library Extension Technical Report Issues List (page 63), this adds support for:

- arrays
- `std::pair`
- the standard containers.
- extending `boost::hash` for custom types.

| Note
This hash function is designed to be used in containers based on the STL and is not suitable as a general purpose hash function. For more details see the rationale.

Last revised: February 20, 2012 at 20:49:37 GMT |