[/ Copyright 2005-2006 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) ]

[section:intro Introduction]

[def __tr1-full__
    [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf
    Draft Technical Report on C++ Library Extensions]]
[def __tr1__
    [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf
    TR1]]
[def __multi-index__ [@../../libs/multi_index/doc/index.html
    Boost Multi-Index Containers Library]]
[def __multi-index-short__ [@../../libs/multi_index/doc/index.html
    Boost.MultiIndex]]
[def __issues__
    [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1837.pdf
    Library Extension Technical Report Issues List]]
[def __hash-function__ [@http://en.wikipedia.org/wiki/Hash_function hash function]]
[def __hash-table__ [@http://en.wikipedia.org/wiki/Hash_table hash table]]

[classref boost::hash] is an implementation of the __hash-function__ object
specified by the __tr1-full__ (TR1). It is intended for use as the default hash function
for unordered associative containers, and the __multi-index__'s hash indexes.

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
__issues__ (page 63), this adds support for:

* arrays
* `std::pair`
* the standard containers.
* extending [classref boost::hash] for custom types.

[endsect]