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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_bimap.the_tutorial.the_collection_of_relations_type"></a><a class="link" href="the_collection_of_relations_type.html" title="The collection of relations type">The
- collection of relations type</a>
- </h3></div></div></div>
- <div class="toc"><dl class="toc">
- <dt><span class="section"><a href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.a_new_point_of_view">A
- new point of view</a></span></dt>
- <dt><span class="section"><a href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.configuration_parameters">Configuration
- parameters</a></span></dt>
- <dt><span class="section"><a href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.examples">Examples</a></span></dt>
- </dl></div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="boost_bimap.the_tutorial.the_collection_of_relations_type.a_new_point_of_view"></a><a class="link" href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.a_new_point_of_view" title="A new point of view">A
- new point of view</a>
- </h4></div></div></div>
- <p>
- Being able to change the collection type of the bimap relation view is
- another very important feature. Remember that this view allows the user
- to see the container as a group of the stored relations. This view has
- set semantics instead of map semantics.
- </p>
- <p>
- <span class="inlinemediaobject"><img src="../../images/bimap/collection.type.of.relation.png" alt="collection.type.of.relation"></span>
- </p>
- <p>
- By default, Boost.Bimap will base the collection type of the relation on
- the type of the left collection. If the left collection type is a set,
- then the collection type of the relation will be a set with the same order
- as the left view.
- </p>
- <p>
- In general, Boost.Bimap users will base the collection type of a relation
- on the type of the collection on one of the two sides. However there are
- times where it is useful to give this collection other constraints or simply
- to order it differently. The user is allowed to choose between:
- </p>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- left_based
- </li>
- <li class="listitem">
- right_based
- </li>
- <li class="listitem">
- set_of_relation<>
- </li>
- <li class="listitem">
- multiset_of_relation<>
- </li>
- <li class="listitem">
- unordered_set_of_relation<>
- </li>
- <li class="listitem">
- unordered_multiset_of_relation<>
- </li>
- <li class="listitem">
- list_of_relation
- </li>
- <li class="listitem">
- vector_of_relation
- </li>
- <li class="listitem">
- unconstrained_set_of_relation
- </li>
- </ul></div>
- <div class="tip"><table border="0" summary="Tip">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../doc/src/images/tip.png"></td>
- <th align="left">Tip</th>
- </tr>
- <tr><td align="left" valign="top"><p>
- The first two options and the last produce faster bimaps, so prefer these
- where possible.
- </p></td></tr>
- </table></div>
- <p>
- <span class="inlinemediaobject"><img src="../../images/bimap/more.bimap.structures.png" alt="more.bimap.structures"></span>
- </p>
- <p>
- The collection type of relation can be used to create powerful containers.
- For example, if you need to maximize search speed, then the best bidirectional
- map possible is one that relates elements from an <code class="computeroutput"><span class="identifier">unordered_set</span></code>
- to another <code class="computeroutput"><span class="identifier">unordered_set</span></code>.
- The problem is that this container cannot be iterated. If you need to know
- the list of relations inside the container, you need another collection
- type of relation. In this case, a <code class="computeroutput"><span class="identifier">list_of_relation</span></code>
- is a good choice. The resulting container trades insertion and deletion
- time against fast search capabilities and the possibility of bidirectional
- iteration.
- </p>
- <p>
- <a href="../../../../example/mighty_bimap.cpp" target="_top">Go to source code</a>
- </p>
- <p>
- </p>
- <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">bimap</span><span class="special">/</span><span class="identifier">bimap</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">bimap</span><span class="special">/</span><span class="identifier">list_of</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">bimap</span><span class="special">/</span><span class="identifier">unordered_set_of</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- <span class="keyword">struct</span> <span class="identifier">english</span> <span class="special">{};</span>
- <span class="keyword">struct</span> <span class="identifier">spanish</span> <span class="special">{};</span>
- <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
- <span class="special">{</span>
- <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bimaps</span><span class="special">;</span>
- <span class="keyword">typedef</span> <span class="identifier">bimap</span>
- <span class="special"><</span>
- <span class="identifier">unordered_set_of</span><span class="special"><</span> <span class="identifier">tagged</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">spanish</span> <span class="special">></span> <span class="special">>,</span>
- <span class="identifier">unordered_set_of</span><span class="special"><</span> <span class="identifier">tagged</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">english</span> <span class="special">></span> <span class="special">>,</span>
- <span class="identifier">list_of_relation</span>
- <span class="special">></span> <span class="identifier">translator</span><span class="special">;</span>
- <span class="identifier">translator</span> <span class="identifier">trans</span><span class="special">;</span>
- <span class="comment">// We have to use `push_back` because the collection of relations is</span>
- <span class="comment">// a `list_of_relation`</span>
- <span class="identifier">trans</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">translator</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">(</span><span class="string">"hola"</span> <span class="special">,</span><span class="string">"hello"</span> <span class="special">)</span> <span class="special">);</span>
- <span class="identifier">trans</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">translator</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">(</span><span class="string">"adios"</span> <span class="special">,</span><span class="string">"goodbye"</span> <span class="special">)</span> <span class="special">);</span>
- <span class="identifier">trans</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">translator</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">(</span><span class="string">"rosa"</span> <span class="special">,</span><span class="string">"rose"</span> <span class="special">)</span> <span class="special">);</span>
- <span class="identifier">trans</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">translator</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">(</span><span class="string">"mesa"</span> <span class="special">,</span><span class="string">"table"</span> <span class="special">)</span> <span class="special">);</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"enter a word"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">word</span><span class="special">;</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">getline</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span><span class="special">,</span><span class="identifier">word</span><span class="special">);</span>
- <span class="comment">// Search the queried word on the from index (Spanish)</span>
- <span class="identifier">translator</span><span class="special">::</span><span class="identifier">map_by</span><span class="special"><</span><span class="identifier">spanish</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">is</span>
- <span class="special">=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">by</span><span class="special"><</span><span class="identifier">spanish</span><span class="special">>().</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">word</span><span class="special">);</span>
- <span class="keyword">if</span><span class="special">(</span> <span class="identifier">is</span> <span class="special">!=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">by</span><span class="special"><</span><span class="identifier">spanish</span><span class="special">>().</span><span class="identifier">end</span><span class="special">()</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">word</span> <span class="special"><<</span> <span class="string">" is said "</span>
- <span class="special"><<</span> <span class="identifier">is</span><span class="special">-></span><span class="identifier">get</span><span class="special"><</span><span class="identifier">english</span><span class="special">>()</span>
- <span class="special"><<</span> <span class="string">" in English"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="special">}</span>
- <span class="keyword">else</span>
- <span class="special">{</span>
- <span class="comment">// Word not found in Spanish, try our luck in English</span>
- <span class="identifier">translator</span><span class="special">::</span><span class="identifier">map_by</span><span class="special"><</span><span class="identifier">english</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">ie</span>
- <span class="special">=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">by</span><span class="special"><</span><span class="identifier">english</span><span class="special">>().</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">word</span><span class="special">);</span>
- <span class="keyword">if</span><span class="special">(</span> <span class="identifier">ie</span> <span class="special">!=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">by</span><span class="special"><</span><span class="identifier">english</span><span class="special">>().</span><span class="identifier">end</span><span class="special">()</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">word</span> <span class="special"><<</span> <span class="string">" is said "</span>
- <span class="special"><<</span> <span class="identifier">ie</span><span class="special">-></span><span class="identifier">get</span><span class="special"><</span><span class="identifier">spanish</span><span class="special">>()</span>
- <span class="special"><<</span> <span class="string">" in Spanish"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="special">}</span>
- <span class="keyword">else</span>
- <span class="special">{</span>
- <span class="comment">// Word not found, show the possible translations</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"No such word in the dictionary"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"These are the possible translations"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="keyword">for</span><span class="special">(</span> <span class="identifier">translator</span><span class="special">::</span><span class="identifier">const_iterator</span>
- <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span>
- <span class="identifier">i_end</span> <span class="special">=</span> <span class="identifier">trans</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span>
- <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">i_end</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">i</span><span class="special">-></span><span class="identifier">get</span><span class="special"><</span><span class="identifier">spanish</span><span class="special">>()</span>
- <span class="special"><<</span> <span class="string">" <---> "</span>
- <span class="special"><<</span> <span class="identifier">i</span><span class="special">-></span><span class="identifier">get</span><span class="special"><</span><span class="identifier">english</span><span class="special">>()</span>
- <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
- <span class="special">}</span>
- <span class="special">}</span>
- <span class="special">}</span>
- <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
- <span class="special">}</span>
- </pre>
- <p>
- </p>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="boost_bimap.the_tutorial.the_collection_of_relations_type.configuration_parameters"></a><a class="link" href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.configuration_parameters" title="Configuration parameters">Configuration
- parameters</a>
- </h4></div></div></div>
- <p>
- Each collection type of relation has different parameters to control its
- behaviour. For example, in the <code class="computeroutput"><span class="identifier">set_of_relation</span></code>
- specification, you can pass a Functor type that compares two types. All
- of the parameters are exactly as in the standard library containers, except
- for the type, which is set to the bimap relation and the allocator type.
- To help users in the creation of each functor, the collection type of relation
- templates takes an mpl lambda expression where the relation type will be
- evaluated later. A placeholder named <code class="computeroutput"><span class="identifier">_relation</span></code>
- is available to bimap users.
- </p>
- <p>
- The following table lists the meaning of the parameters for each collection
- type of relations.
- </p>
- <div class="informaltable"><table class="table">
- <colgroup>
- <col>
- <col>
- </colgroup>
- <thead><tr>
- <th>
- <p>
- name
- </p>
- </th>
- <th>
- <p>
- Additional Parameters
- </p>
- </th>
- </tr></thead>
- <tbody>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">left_based</span></code>
- </p>
- </td>
- <td>
- <p>
- Not a template.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">right_based</span></code>
- </p>
- </td>
- <td>
- <p>
- Not a template.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">set_of_relation</span><span class="special"><</span><span class="identifier">KeyComp</span><span class="special">></span></code>
- </p>
- <p>
- <code class="computeroutput"><span class="identifier">multiset_of_relation</span><span class="special"><</span><span class="identifier">KeyComp</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- <span class="bold"><strong>KeyComp </strong></span> is a Functor that compares
- two types using less than. By default, the less-than operator
- is <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">_relation</span><span class="special">></span></code>.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">unordered_set_of_relation</span><span class="special"><</span><span class="identifier">HashFunctor</span><span class="special">,</span><span class="identifier">EqualKey</span><span class="special">></span></code>
- </p>
- <p>
- <code class="computeroutput"><span class="identifier">unordered_multiset_of_relation</span><span class="special"><</span><span class="identifier">HashFunctor</span><span class="special">,</span><span class="identifier">EqualKey</span><span class="special">></span></code>
- </p>
- </td>
- <td>
- <p>
- <span class="bold"><strong>HashFunctor </strong></span> converts the <code class="computeroutput"><span class="identifier">relation</span></code> into an <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span></code> value. By default it
- is <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">hash</span><span class="special"><</span><span class="identifier">_relation</span><span class="special">></span></code>.
- </p>
- <p>
- <span class="bold"><strong>EqualKey </strong></span> is a Functor that
- tests two relations for equality. By default, the equality operator
- is <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">_relation</span><span class="special">></span></code>.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">list_of_relation</span></code>
- </p>
- </td>
- <td>
- <p>
- Not a template.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">vector_of_relation</span></code>
- </p>
- </td>
- <td>
- <p>
- Not a template.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">unconstrained_set_of_relation</span></code>
- </p>
- </td>
- <td>
- <p>
- Not a template.
- </p>
- </td>
- </tr>
- </tbody>
- </table></div>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h4 class="title">
- <a name="boost_bimap.the_tutorial.the_collection_of_relations_type.examples"></a><a class="link" href="the_collection_of_relations_type.html#boost_bimap.the_tutorial.the_collection_of_relations_type.examples" title="Examples">Examples</a>
- </h4></div></div></div>
- <p>
- Consider this example:
- </p>
- <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Rel</span> <span class="special">></span>
- <span class="keyword">struct</span> <span class="identifier">RelOrder</span>
- <span class="special">{</span>
- <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Rel</span> <span class="identifier">ra</span><span class="special">,</span> <span class="identifier">Rel</span> <span class="identifier">rb</span><span class="special">)</span> <span class="keyword">const</span>
- <span class="special">{</span>
- <span class="keyword">return</span> <span class="special">(</span><span class="identifier">ra</span><span class="special">.</span><span class="identifier">left</span><span class="special">+</span><span class="identifier">ra</span><span class="special">.</span><span class="identifier">right</span><span class="special">)</span> <span class="special"><</span> <span class="special">(</span><span class="identifier">rb</span><span class="special">.</span><span class="identifier">left</span><span class="special">+</span><span class="identifier">rb</span><span class="special">.</span><span class="identifier">right</span><span class="special">);</span>
- <span class="special">}</span>
- <span class="special">};</span>
- <span class="keyword">typedef</span> <span class="identifier">bimap</span>
- <span class="special"><</span>
- <span class="identifier">multiset_of</span><span class="special"><</span> <span class="keyword">int</span> <span class="special">>,</span>
- <span class="identifier">multiset_of</span><span class="special"><</span> <span class="keyword">int</span> <span class="special">>,</span>
- <span class="identifier">set_of_relation</span><span class="special"><</span> <span class="identifier">RelOrder</span><span class="special"><</span><span class="identifier">_relation</span><span class="special">></span> <span class="special">></span>
- <span class="special">></span> <span class="identifier">bimap_type</span><span class="special">;</span>
- </pre>
- <p>
- Here the bimap relation view is ordered using the information of both sides.
- This container will only allow unique relations because <code class="computeroutput"><span class="identifier">set_of_relation</span></code>
- has been used but the elements in each side of the bimap can be repeated.
- </p>
- <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">name</span> <span class="special">{};</span>
- <span class="keyword">struct</span> <span class="identifier">phone_number</span> <span class="special">{};</span>
- <span class="keyword">typedef</span> <span class="identifier">bimap</span>
- <span class="special"><</span>
- <span class="identifier">tagged</span><span class="special"><</span> <span class="identifier">unordered_multiset_of</span><span class="special"><</span> <span class="identifier">string</span> <span class="special">>,</span> <span class="identifier">name</span> <span class="special">>,</span>
- <span class="identifier">tagged</span><span class="special"><</span> <span class="identifier">unordered_set_of</span> <span class="special"><</span> <span class="keyword">int</span> <span class="special">>,</span> <span class="identifier">phone_number</span> <span class="special">>,</span>
- <span class="identifier">set_of_relation</span><span class="special"><></span>
- <span class="special">></span> <span class="identifier">bimap_type</span><span class="special">;</span>
- </pre>
- <p>
- In this other case the bimap will relate names to phone numbers. Names
- can be repeated and phone numbers are unique. You can perform quick searches
- by name or phone number and the container can be viewed ordered using the
- relation view.
- </p>
- </div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2006-2012 Matias Capeletto<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
- </p>
- </div></td>
- </tr></table>
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