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<link rel="start" href="../index.html" title="Chapter 1. Boost.Bimap">
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Libraries that work well with Boost.Bimap">
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<img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"><img alt="Chapter Logo" src="../images/bimap/boost.bimap.header.png">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_bimap.bimap_and_boost"></a><a href="bimap_and_boost.html" title="Bimap and Boost">Bimap and Boost</a>
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</h2></div></div></div>
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<div class="toc"><dl>
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<dt><span class="section"><a href="bimap_and_boost.html#boost_bimap.bimap_and_boost.bimap_and_multiindex">Bimap
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and MultiIndex</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html">Boost
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Libraries that work well with Boost.Bimap</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.introduction">Introduction</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_serialization">Boost.Serialization</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_assign">Boost.Assign</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_hash">Boost.Hash</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_lambda">Boost.Lambda</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_range">Boost.Range</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_foreach">Boost.Foreach</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_typeof">Boost.Typeof</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_xpressive">Boost.Xpressive</a></span></dt>
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<dt><span class="section"><a href="bimap_and_boost/boost_libraries_that_work_well_with_boost_bimap.html#boost_bimap.bimap_and_boost.boost_libraries_that_work_well_with_boost_bimap.boost_property_map">Boost.Property_map</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="bimap_and_boost/dependencies.html">Dependencies</a></span></dt>
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</dl></div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_bimap.bimap_and_boost.bimap_and_multiindex"></a><a href="bimap_and_boost.html#boost_bimap.bimap_and_boost.bimap_and_multiindex" title="Bimap
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and MultiIndex">Bimap
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and MultiIndex</a>
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</h3></div></div></div>
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<p>
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<span class="emphasis"><em>MISC</em></span> - <span class="bold"><strong>M</strong></span>ulti-<span class="bold"><strong>I</strong></span>ndex <span class="bold"><strong>S</strong></span>pecialized
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<span class="bold"><strong>C</strong></span>ontainers
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</p>
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<div class="blockquote"><blockquote class="blockquote">
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<p>
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</p>
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<p>
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<span class="emphasis"><em> Let's be generic, construct frameworks, describe the world
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in an unified way... </em></span>
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</p>
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<p>
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</p>
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</blockquote></div>
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<div class="blockquote"><blockquote class="blockquote">
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<p>
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</p>
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<p>
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<span class="emphasis"><em> No!, it is better to be specialized, design easy-to-use components,
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offer plug-and-play objects... </em></span>
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</p>
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<p>
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</p>
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</blockquote></div>
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<div class="blockquote"><blockquote class="blockquote">
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<p>
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</p>
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<p>
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<span class="bold"><strong> Why not take advantage of the best of both worlds?
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</strong></span>
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</p>
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<p>
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</p>
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</blockquote></div>
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<p>
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<span class="inlinemediaobject"><img src="../images/bimap/miBimapFramework.png" alt="miBimapFramework"></span>
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</p>
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<p>
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With Boost.Bimap, you can build associative containers in which both types
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can be used as key. There is a library in Boost that already allows the creation
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of this kind of container: Boost.MultiIndex. It offers great flexibility
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and lets you construct almost any container that you could dream of. The
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framework is very clean. You migh want to read this library's tutorial to
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learn about the power that has been achieved.
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</p>
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<p>
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But generality comes at a price: the interface that results might not be
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the best for every specialization. People may end up wrapping a B.MI container
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in its own class every time they want to use it as a bidirectional map. Boost.Bimap
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takes advantage of the narrower scope to produce a better interface for bidirectional
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maps
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<sup>[<a name="id2646422" href="#ftn.id2646422">2</a>]</sup>
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. There is no learning curve if you know how to use standard containers.
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Great effort was put into mapping the naming scheme of the STL to Boost.Bimap.
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The library is designed to match the common STL containers.
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</p>
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<p>
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Boost.MultiIndex is, in fact, the core of the bimap container.
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</p>
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<p>
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However, Boost.Bimap do not aim to tackle every problem with two indexed
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types. There exist some problems that are better modelled with Boost.MultiIndex.
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</p>
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<div class="sidebar">
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<p>
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<span class="bold"><strong>Problem I - An employee register</strong></span>
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</p>
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<p>
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<span class="emphasis"><em>Store an ID and a name for an employee, with fast search on each
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member.</em></span>
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</p>
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<p>
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This type of problem is better modelled as a database table, and <span class="bold"><strong>Boost.MultiIndex</strong></span> is the preferred choice. It is possible
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that other data will need to be indexed later.
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</p>
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<p>
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</p>
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</div>
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<div class="sidebar">
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<p>
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<span class="bold"><strong>Problem II - A partners container</strong></span>
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</p>
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<p>
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<span class="emphasis"><em>Store the names of couples and be able to get the name of a person's
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partner.</em></span>
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</p>
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<p>
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This problem is better modelled as a collection of relations, and <span class="bold"><strong>Boost.Bimap</strong></span> fits nicely here.
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</p>
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<p>
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</p>
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</div>
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<p>
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You can also read <a href="the_tutorial/additional_information.html" title="Additional
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information">Additional
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Information</a> for more information about the relation of this two libraries.
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</p>
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</div>
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<div class="footnotes">
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<br><hr width="100" align="left">
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<div class="footnote"><p><sup>[<a name="ftn.id2646422" href="#id2646422">2</a>] </sup>
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In the same fashion, Boost.MRU will allow the creation of <span class="emphasis"><em>most
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recent updated</em></span> aware containers, hiding the complexity of
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Boost.MultiIndex.
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</p></div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><small>Copyright © 2006 -2007 Matias Capeletto</small></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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