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  25 <div class="section boost_bimap_the_tutorial_bimaps_with_user_defined_names">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_bimap.the_tutorial.bimaps_with_user_defined_names"></a><a class="link" href="bimaps_with_user_defined_names.html" title="Bimaps with user defined names">Bimaps
  28       with user defined names</a>
  29 </h3></div></div></div>
  30 <p>
  31         In the following example, the library user inserted comments to guide future
  32         programmers:
  33       </p>
  34 <p>
  35         <a href="../../../../example/user_defined_names.cpp" target="_top">Go to source code</a>
  36       </p>
  37 <p>
  38 </p>
  39 <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">bimap</span>
  40 <span class="special">&lt;</span>
  41     <span class="identifier">multiset_of</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;,</span>
  42     <span class="keyword">int</span>
  43
  44 <span class="special">&gt;</span> <span class="identifier">People</span><span class="special">;</span>
  45
  46 <span class="identifier">People</span> <span class="identifier">people</span><span class="special">;</span>
  47
  48 <span class="comment">// ...</span>
  49
  50 <span class="keyword">int</span> <span class="identifier">user_id</span><span class="special">;</span>
  51 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">user_id</span><span class="special">;</span>
  52
  53 <span class="comment">// people.right : map&lt;id,name&gt;</span>
  54
  55 <span class="identifier">People</span><span class="special">::</span><span class="identifier">right_const_iterator</span> <span class="identifier">id_iter</span> <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">right</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">user_id</span><span class="special">);</span>
  56 <span class="keyword">if</span><span class="special">(</span> <span class="identifier">id_iter</span> <span class="special">!=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">right</span><span class="special">.</span><span class="identifier">end</span><span class="special">()</span> <span class="special">)</span>
  57 <span class="special">{</span>
  58     <span class="comment">// first  : id</span>
  59     <span class="comment">// second : name</span>
  60
  61     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"name: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">id_iter</span><span class="special">-&gt;</span><span class="identifier">second</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
  62               <span class="special">&lt;&lt;</span> <span class="string">"id:   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">id_iter</span><span class="special">-&gt;</span><span class="identifier">first</span>  <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  63 <span class="special">}</span>
  64 <span class="keyword">else</span>
  65 <span class="special">{</span>
  66     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Unknown id, users are:"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  67
  68     <span class="comment">// people.left : map&lt;name,id&gt;</span>
  69
  70     <span class="keyword">for</span><span class="special">(</span> <span class="identifier">People</span><span class="special">::</span><span class="identifier">left_const_iterator</span>
  71             <span class="identifier">name_iter</span> <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span>
  72             <span class="identifier">iend</span>      <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span>
  73
  74          <span class="identifier">name_iter</span> <span class="special">!=</span> <span class="identifier">iend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">name_iter</span> <span class="special">)</span>
  75     <span class="special">{</span>
  76         <span class="comment">// first  : name</span>
  77         <span class="comment">// second : id</span>
  78
  79         <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"name: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">name_iter</span><span class="special">-&gt;</span><span class="identifier">first</span>  <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
  80                   <span class="special">&lt;&lt;</span> <span class="string">"id:   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">name_iter</span><span class="special">-&gt;</span><span class="identifier">second</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  81     <span class="special">}</span>
  82 <span class="special">}</span>
  83 </pre>
  84 <p>
  85       </p>
  86 <p>
  87         In Boost.Bimap there is a better way to document the code and in the meantime
  88         helping you to write more maintainable and readable code. You can tag the
  89         two collections of the bimap so they can be accessed by more descriptive
  90         names.
  91       </p>
  92 <p>
  93         <span class="inlinemediaobject"><img src="../../images/bimap/tagged.png" alt="tagged"></span>
  94       </p>
  95 <p>
  96         A tagged type is a type that has been labelled using a tag. A tag is any
  97         valid C++ type. In a bimap, the types are always tagged. If you do not specify
  98         your own tag, the container uses <code class="computeroutput"><span class="identifier">member_at</span><span class="special">::</span><span class="identifier">left</span></code>
  99         and <code class="computeroutput"><span class="identifier">member_at</span><span class="special">::</span><span class="identifier">right</span></code> to tag the left and right sides respectively.
 100         In order to specify a custom tag, the type of each side has to be tagged.
 101         Tagging a type is very simple:
 102       </p>
 103 <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">a_tag</span> <span class="special">&gt;</span> <span class="identifier">tagged_int</span><span class="special">;</span>
 104 </pre>
 105 <p>
 106         Now we can rewrite the example:
 107       </p>
 108 <p>
 109         <a href="../../../../example/user_defined_names.cpp" target="_top">Go to source code</a>
 110       </p>
 111 <p>
 112 </p>
 113 <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">id</span>   <span class="special">{};</span> <span class="comment">// Tag for the identification number</span>
 114 <span class="keyword">struct</span> <span class="identifier">name</span> <span class="special">{};</span> <span class="comment">// Tag for the name of the person</span>
 115
 116 <span class="keyword">typedef</span> <span class="identifier">bimap</span>
 117 <span class="special">&lt;</span>
 118                  <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="keyword">int</span>        <span class="special">,</span> <span class="identifier">id</span>   <span class="special">&gt;</span>  <span class="special">,</span>
 119     <span class="identifier">multiset_of</span><span class="special">&lt;</span> <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">name</span> <span class="special">&gt;</span> <span class="special">&gt;</span>
 120
 121 <span class="special">&gt;</span> <span class="identifier">People</span><span class="special">;</span>
 122
 123 <span class="identifier">People</span> <span class="identifier">people</span><span class="special">;</span>
 124
 125 <span class="comment">// ...</span>
 126
 127 <span class="keyword">int</span> <span class="identifier">user_id</span><span class="special">;</span>
 128 <span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">user_id</span><span class="special">;</span>
 129
 130 <span class="identifier">People</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">id</span><span class="special">&gt;::</span><span class="identifier">const_iterator</span> <span class="identifier">id_iter</span> <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">id</span><span class="special">&gt;().</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">user_id</span><span class="special">);</span>
 131 <span class="keyword">if</span><span class="special">(</span> <span class="identifier">id_iter</span> <span class="special">!=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">id</span><span class="special">&gt;().</span><span class="identifier">end</span><span class="special">()</span> <span class="special">)</span>
 132 <span class="special">{</span>
 133     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"name: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">id_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">name</span><span class="special">&gt;()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
 134               <span class="special">&lt;&lt;</span> <span class="string">"id:   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">id_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">id</span><span class="special">&gt;()</span>   <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 135 <span class="special">}</span>
 136 <span class="keyword">else</span>
 137 <span class="special">{</span>
 138     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Unknown id, users are:"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 139
 140     <span class="keyword">for</span><span class="special">(</span> <span class="identifier">People</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">name</span><span class="special">&gt;::</span><span class="identifier">const_iterator</span>
 141             <span class="identifier">name_iter</span> <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">name</span><span class="special">&gt;().</span><span class="identifier">begin</span><span class="special">(),</span>
 142             <span class="identifier">iend</span>      <span class="special">=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">name</span><span class="special">&gt;().</span><span class="identifier">end</span><span class="special">();</span>
 143
 144         <span class="identifier">name_iter</span> <span class="special">!=</span> <span class="identifier">iend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">name_iter</span> <span class="special">)</span>
 145     <span class="special">{</span>
 146         <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"name: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">name_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">name</span><span class="special">&gt;()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
 147                   <span class="special">&lt;&lt;</span> <span class="string">"id:   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">name_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">id</span><span class="special">&gt;()</span>   <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 148     <span class="special">}</span>
 149 <span class="special">}</span>
 150 </pre>
 151 <p>
 152       </p>
 153 <p>
 154         Here is a list of common structures in both tagged and untagged versions.
 155         Remember that when the bimap has user defined tags you can still use the
 156         untagged version structures.
 157       </p>
 158 <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">Left</span>  <span class="special">{};</span>
 159 <span class="keyword">struct</span> <span class="identifier">Right</span> <span class="special">{};</span>
 160 <span class="keyword">typedef</span> <span class="identifier">bimap</span><span class="special">&lt;</span>
 161          <span class="identifier">multiset_of</span><span class="special">&lt;</span> <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">Left</span>  <span class="special">&gt;</span> <span class="special">&gt;,</span>
 162     <span class="identifier">unordered_set_of</span><span class="special">&lt;</span> <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">Right</span> <span class="special">&gt;</span> <span class="special">&gt;</span>
 163 <span class="special">&gt;</span> <span class="identifier">bm_type</span><span class="special">;</span>
 164
 165 <span class="identifier">bm_type</span> <span class="identifier">bm</span><span class="special">;</span>
 166
 167 <span class="comment">//...</span>
 168
 169 <span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">iterator</span>       <span class="identifier">iter</span>       <span class="special">=</span> <span class="identifier">bm</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
 170 <span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">left_iterator</span>  <span class="identifier">left_iter</span>  <span class="special">=</span> <span class="identifier">bm</span><span class="special">.</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
 171 <span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">right_iterator</span> <span class="identifier">right_iter</span> <span class="special">=</span> <span class="identifier">bm</span><span class="special">.</span><span class="identifier">right</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
 172 </pre>
 173 <div class="table">
 174 <a name="boost_bimap.the_tutorial.bimaps_with_user_defined_names.t0"></a><p class="title"><b>Table&#160;1.3.&#160;Equivalence of expresions using user defined names</b></p>
 175 <div class="table-contents"><table class="table" summary="Equivalence of expresions using user defined names">
 176 <colgroup>
 177 <col>
 178 <col>
 179 </colgroup>
 180 <thead><tr>
 181 <th>
 182                 <p>
 183                   Untagged version
 184                 </p>
 185               </th>
 186 <th>
 187                 <p>
 188                   Tagged version
 189                 </p>
 190               </th>
 191 </tr></thead>
 192 <tbody>
 193 <tr>
 194 <td>
 195                 <p>
 196                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">left</span></code>
 197                 </p>
 198               </td>
 199 <td>
 200                 <p>
 201                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;()</span></code>
 202                 </p>
 203               </td>
 204 </tr>
 205 <tr>
 206 <td>
 207                 <p>
 208                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">right</span></code>
 209                 </p>
 210               </td>
 211 <td>
 212                 <p>
 213                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">by</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;()</span></code>
 214                 </p>
 215               </td>
 216 </tr>
 217 <tr>
 218 <td>
 219                 <p>
 220                   <code class="computeroutput"><span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">left_map</span></code>
 221                 </p>
 222               </td>
 223 <td>
 224                 <p>
 225                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
 226                 </p>
 227               </td>
 228 </tr>
 229 <tr>
 230 <td>
 231                 <p>
 232                   <code class="computeroutput"><span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">right_value_type</span></code>
 233                 </p>
 234               </td>
 235 <td>
 236                 <p>
 237                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;::</span><span class="identifier">value_type</span></code>
 238                 </p>
 239               </td>
 240 </tr>
 241 <tr>
 242 <td>
 243                 <p>
 244                   <code class="computeroutput"><span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">left_iterator</span></code>
 245                 </p>
 246               </td>
 247 <td>
 248                 <p>
 249                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;::</span><span class="identifier">iterator</span></code>
 250                 </p>
 251               </td>
 252 </tr>
 253 <tr>
 254 <td>
 255                 <p>
 256                   <code class="computeroutput"><span class="identifier">bm_type</span><span class="special">::</span><span class="identifier">right_const_iterator</span></code>
 257                 </p>
 258               </td>
 259 <td>
 260                 <p>
 261                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">::</span><span class="identifier">map_by</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;::</span><span class="identifier">const_iterator</span></code>
 262                 </p>
 263               </td>
 264 </tr>
 265 <tr>
 266 <td>
 267                 <p>
 268                   <code class="computeroutput"><span class="identifier">iter</span><span class="special">-&gt;</span><span class="identifier">left</span></code>
 269                 </p>
 270               </td>
 271 <td>
 272                 <p>
 273                   <code class="computeroutput"><span class="identifier">iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;()</span></code>
 274                 </p>
 275               </td>
 276 </tr>
 277 <tr>
 278 <td>
 279                 <p>
 280                   <code class="computeroutput"><span class="identifier">iter</span><span class="special">-&gt;</span><span class="identifier">right</span></code>
 281                 </p>
 282               </td>
 283 <td>
 284                 <p>
 285                   <code class="computeroutput"><span class="identifier">iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;()</span></code>
 286                 </p>
 287               </td>
 288 </tr>
 289 <tr>
 290 <td>
 291                 <p>
 292                   <code class="computeroutput"><span class="identifier">left_iter</span><span class="special">-&gt;</span><span class="identifier">first</span></code>
 293                 </p>
 294               </td>
 295 <td>
 296                 <p>
 297                   <code class="computeroutput"><span class="identifier">left_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;()</span></code>
 298                 </p>
 299               </td>
 300 </tr>
 301 <tr>
 302 <td>
 303                 <p>
 304                   <code class="computeroutput"><span class="identifier">left_iter</span><span class="special">-&gt;</span><span class="identifier">second</span></code>
 305                 </p>
 306               </td>
 307 <td>
 308                 <p>
 309                   <code class="computeroutput"><span class="identifier">left_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;()</span></code>
 310                 </p>
 311               </td>
 312 </tr>
 313 <tr>
 314 <td>
 315                 <p>
 316                   <code class="computeroutput"><span class="identifier">right_iter</span><span class="special">-&gt;</span><span class="identifier">first</span></code>
 317                 </p>
 318               </td>
 319 <td>
 320                 <p>
 321                   <code class="computeroutput"><span class="identifier">right_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;()</span></code>
 322                 </p>
 323               </td>
 324 </tr>
 325 <tr>
 326 <td>
 327                 <p>
 328                   <code class="computeroutput"><span class="identifier">right_iter</span><span class="special">-&gt;</span><span class="identifier">second</span></code>
 329                 </p>
 330               </td>
 331 <td>
 332                 <p>
 333                   <code class="computeroutput"><span class="identifier">right_iter</span><span class="special">-&gt;</span><span class="identifier">get</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;()</span></code>
 334                 </p>
 335               </td>
 336 </tr>
 337 <tr>
 338 <td>
 339                 <p>
 340                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">project_left</span><span class="special">(</span><span class="identifier">iter</span><span class="special">)</span></code>
 341                 </p>
 342               </td>
 343 <td>
 344                 <p>
 345                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">project</span><span class="special">&lt;</span><span class="identifier">Left</span><span class="special">&gt;(</span><span class="identifier">iter</span><span class="special">)</span></code>
 346                 </p>
 347               </td>
 348 </tr>
 349 <tr>
 350 <td>
 351                 <p>
 352                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">project_right</span><span class="special">(</span><span class="identifier">iter</span><span class="special">)</span></code>
 353                 </p>
 354               </td>
 355 <td>
 356                 <p>
 357                   <code class="computeroutput"><span class="identifier">bm</span><span class="special">.</span><span class="identifier">project</span><span class="special">&lt;</span><span class="identifier">Right</span><span class="special">&gt;(</span><span class="identifier">iter</span><span class="special">)</span></code>
 358                 </p>
 359               </td>
 360 </tr>
 361 </tbody>
 362 </table></div>
 363 </div>
 364 <br class="table-break">
 365 </div>
 366 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 367 <td align="left"></td>
 368 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Matias Capeletto<p>
 369         Distributed under the Boost Software License, Version 1.0. (See accompanying
 370         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>)
 371       </p>
 372 </div></td>
 373 </tr></table>
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