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| <div class="section"> |
| <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> |
| <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" 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 -2007 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> |
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