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  25 <div class="section">
  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance"></a><a class="link" href="customizing_for_tolerance.html" title="Enabling tolerance for user-defined types">Enabling
  28           tolerance for user-defined types</a>
  29 </h5></div></div></div>
  30 <p>
  31             The <span class="emphasis"><em>Unit Test Framework</em></span> recognizes that a given
  32             type <code class="computeroutput"><span class="identifier">T</span></code> is suitable for
  33             tolerance-based comparisons using the expression <code class="computeroutput"><a class="link" href="../../../../boost/math/fpc/tolerance_based.html" title="Struct template tolerance_based">boost::math::fpc::tolerance_based</a></code><code class="computeroutput"><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value</span></code>.
  34             This meta-function already returns <code class="computeroutput"><span class="keyword">true</span></code>
  35             for built-in floating-point types as well as any other types that match
  36             the following compile-time expression:
  37           </p>
  38 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_floating_point</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">||</span>
  39     <span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">is_specialized</span> <span class="special">&amp;&amp;</span>
  40      <span class="special">!</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">is_integer</span> <span class="special">&amp;&amp;</span>
  41      <span class="special">!</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">is_exact</span><span class="special">)</span>
  42 </pre>
  43 <p>
  44             If you require your type to also participate in tolerance-based comparisons,
  45             regardless of the above expression, you can just specialize <code class="computeroutput"><a class="link" href="../../../../boost/math/fpc/tolerance_based.html" title="Struct template tolerance_based">boost::math::fpc::tolerance_based</a></code>
  46             for your type directly, and derive it from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">true_type</span></code>.
  47             Your type does not even have to be a floating-point type provided that
  48             it models concept <a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.concept_tolerance_based"><code class="computeroutput"><span class="identifier">ToleranceCompatible</span></code></a>.
  49           </p>
  50 <h6>
  51 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h0"></a>
  52             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.example_descr"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.example_descr">Example:
  53             adapting user-defined types for tolerance-based comparison</a>
  54           </h6>
  55 <div class="informaltable"><table class="table">
  56 <colgroup><col></colgroup>
  57 <thead><tr><th>
  58                     <p>
  59                       Code
  60                     </p>
  61                   </th></tr></thead>
  62 <tbody><tr><td>
  63 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">tolerance_04</span>
  64 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  65 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">rational</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  66 <span class="keyword">namespace</span> <span class="identifier">utf</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">;</span>
  67 <span class="keyword">namespace</span> <span class="identifier">tt</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">test_tools</span><span class="special">;</span>
  68
  69 <span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">math</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">fpc</span> <span class="special">{</span>
  70
  71   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">I</span><span class="special">&gt;</span>
  72   <span class="keyword">struct</span> <span class="identifier">tolerance_based</span><span class="special">&lt;</span> <span class="identifier">rational</span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">true_type</span><span class="special">{};</span>
  73
  74 <span class="special">}</span> <span class="special">}</span> <span class="special">}</span>
  75
  76 <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">rational</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">ratio</span><span class="special">;</span>
  77
  78 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test1</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">ratio</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">1000</span><span class="special">)))</span>
  79 <span class="special">{</span>
  80   <span class="identifier">ratio</span> <span class="identifier">x</span> <span class="special">(</span><span class="number">1002</span><span class="special">,</span> <span class="number">100</span><span class="special">);</span> <span class="comment">// 10.02</span>
  81   <span class="identifier">ratio</span> <span class="identifier">y</span> <span class="special">(</span><span class="number">1001</span><span class="special">,</span> <span class="number">100</span><span class="special">);</span> <span class="comment">// 10.01</span>
  82   <span class="identifier">ratio</span> <span class="identifier">z</span> <span class="special">(</span><span class="number">1000</span><span class="special">,</span> <span class="number">100</span><span class="special">);</span> <span class="comment">// 10.00</span>
  83
  84   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">x</span> <span class="special">==</span> <span class="identifier">y</span><span class="special">);</span>  <span class="comment">// irrelevant diff by default</span>
  85   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">x</span> <span class="special">==</span> <span class="identifier">y</span><span class="special">,</span> <span class="identifier">tt</span><span class="special">::</span><span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">ratio</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2000</span><span class="special">)));</span>
  86
  87   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">x</span> <span class="special">!=</span> <span class="identifier">z</span><span class="special">);</span>  <span class="comment">// relevant diff by default</span>
  88   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">x</span> <span class="special">!=</span> <span class="identifier">z</span><span class="special">,</span> <span class="identifier">tt</span><span class="special">::</span><span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">ratio</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">1000</span><span class="special">)));</span>
  89 <span class="special">}</span>
  90 </pre>
  91                   </td></tr></tbody>
  92 </table></div>
  93 <div class="informaltable"><table class="table">
  94 <colgroup><col></colgroup>
  95 <thead><tr><th>
  96                     <p>
  97                       Output
  98                     </p>
  99                   </th></tr></thead>
 100 <tbody><tr><td>
 101 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">tolerance_04</span>
 102 <span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
 103 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">23</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">x</span> <span class="special">==</span> <span class="identifier">y</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">501</span><span class="special">/</span><span class="number">50</span> <span class="special">!=</span> <span class="number">1001</span><span class="special">/</span><span class="number">100</span><span class="special">].</span> <span class="identifier">Relative</span> <span class="identifier">difference</span> <span class="identifier">exceeds</span> <span class="identifier">tolerance</span> <span class="special">[</span><span class="number">1</span><span class="special">/</span><span class="number">1001</span> <span class="special">&gt;</span> <span class="number">1</span><span class="special">/</span><span class="number">2000</span><span class="special">]</span>
 104 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">26</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">x</span> <span class="special">!=</span> <span class="identifier">z</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">501</span><span class="special">/</span><span class="number">50</span> <span class="special">==</span> <span class="number">10</span><span class="special">/</span><span class="number">1</span><span class="special">].</span> <span class="identifier">Relative</span> <span class="identifier">difference</span> <span class="identifier">is</span> <span class="identifier">within</span> <span class="identifier">tolerance</span> <span class="special">[</span><span class="number">1</span><span class="special">/</span><span class="number">501</span> <span class="special">&lt;</span> <span class="number">1</span><span class="special">/</span><span class="number">500</span><span class="special">]</span>
 105
 106 <span class="special">***</span> <span class="number">2</span> <span class="identifier">failures</span> <span class="identifier">are</span> <span class="identifier">detected</span> <span class="identifier">in</span> <span class="identifier">the</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"tolerance_04"</span>
 107 </pre>
 108                   </td></tr></tbody>
 109 </table></div>
 110 <h4>
 111 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h1"></a>
 112             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.concept_tolerance_based"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.concept_tolerance_based">Concept
 113             <code class="computeroutput"><span class="identifier">ToleranceCompatible</span></code></a>
 114           </h4>
 115 <h5>
 116 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h2"></a>
 117             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.refinement_of"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.refinement_of">Refinement
 118             of</a>
 119           </h5>
 120 <p>
 121             <a href="https://en.cppreference.com/w/cpp/named_req/MoveConstructible" target="_top"><code class="computeroutput"><span class="identifier">MoveConstructible</span></code></a>, <a href="https://en.cppreference.com/w/cpp/named_req/EqualityComparable" target="_top"><code class="computeroutput"><span class="identifier">EqualityComparable</span></code></a>, <a href="https://en.cppreference.com/w/cpp/named_req/LessThanComparable" target="_top"><code class="computeroutput"><span class="identifier">LessThanComparable</span></code></a>
 122           </p>
 123 <h5>
 124 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h3"></a>
 125             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.notation"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.notation">Notation</a>
 126           </h5>
 127 <div class="informaltable"><table class="table">
 128 <colgroup>
 129 <col>
 130 <col>
 131 </colgroup>
 132 <thead><tr>
 133 <th>
 134                   </th>
 135 <th>
 136                   </th>
 137 </tr></thead>
 138 <tbody>
 139 <tr>
 140 <td>
 141                     <p>
 142                       <code class="computeroutput"><span class="identifier">T</span></code>
 143                     </p>
 144                   </td>
 145 <td>
 146                     <p>
 147                       A type that is a model of <code class="computeroutput"><span class="identifier">ToleranceCompatible</span></code>
 148                     </p>
 149                   </td>
 150 </tr>
 151 <tr>
 152 <td>
 153                     <p>
 154                       <code class="computeroutput"><span class="identifier">x</span></code>, <code class="computeroutput"><span class="identifier">y</span></code>
 155                     </p>
 156                   </td>
 157 <td>
 158                     <p>
 159                       objects of type <code class="computeroutput"><span class="identifier">T</span></code>
 160                     </p>
 161                   </td>
 162 </tr>
 163 <tr>
 164 <td>
 165                     <p>
 166                       <code class="computeroutput"><span class="identifier">i</span></code>, <code class="computeroutput"><span class="identifier">j</span></code>
 167                     </p>
 168                   </td>
 169 <td>
 170                     <p>
 171                       objects of type <code class="computeroutput"><span class="keyword">int</span></code>
 172                     </p>
 173                   </td>
 174 </tr>
 175 </tbody>
 176 </table></div>
 177 <h5>
 178 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h4"></a>
 179             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.valid_expressions"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.valid_expressions">Valid
 180             expressions</a>
 181           </h5>
 182 <div class="informaltable"><table class="table">
 183 <colgroup>
 184 <col>
 185 <col>
 186 <col>
 187 </colgroup>
 188 <thead><tr>
 189 <th>
 190                     <p>
 191                       Name
 192                     </p>
 193                   </th>
 194 <th>
 195                     <p>
 196                       Expression
 197                     </p>
 198                   </th>
 199 <th>
 200                     <p>
 201                       Return type
 202                     </p>
 203                   </th>
 204 </tr></thead>
 205 <tbody>
 206 <tr>
 207 <td>
 208                     <p>
 209                       Conversion from <code class="computeroutput"><span class="keyword">int</span></code>
 210                     </p>
 211                   </td>
 212 <td>
 213                     <p>
 214                       <code class="computeroutput"><span class="identifier">T</span> <span class="identifier">j</span>
 215                       <span class="special">=</span> <span class="identifier">i</span><span class="special">;</span></code>
 216                     </p>
 217                   </td>
 218 <td>
 219                   </td>
 220 </tr>
 221 <tr>
 222 <td>
 223                     <p>
 224                       Addition
 225                     </p>
 226                   </td>
 227 <td>
 228                     <p>
 229                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">+</span>
 230                       <span class="identifier">y</span></code>
 231                     </p>
 232                   </td>
 233 <td>
 234                     <p>
 235                       <code class="computeroutput"><span class="identifier">T</span></code>
 236                     </p>
 237                   </td>
 238 </tr>
 239 <tr>
 240 <td>
 241                     <p>
 242                       Subtraction
 243                     </p>
 244                   </td>
 245 <td>
 246                     <p>
 247                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">-</span>
 248                       <span class="identifier">y</span></code>
 249                     </p>
 250                   </td>
 251 <td>
 252                     <p>
 253                       <code class="computeroutput"><span class="identifier">T</span></code>
 254                     </p>
 255                   </td>
 256 </tr>
 257 <tr>
 258 <td>
 259                     <p>
 260                       Negation
 261                     </p>
 262                   </td>
 263 <td>
 264                     <p>
 265                       <code class="computeroutput"><span class="special">-</span><span class="identifier">x</span></code>
 266                     </p>
 267                   </td>
 268 <td>
 269                     <p>
 270                       <code class="computeroutput"><span class="identifier">T</span></code>
 271                     </p>
 272                   </td>
 273 </tr>
 274 <tr>
 275 <td>
 276                     <p>
 277                       Multiplication
 278                     </p>
 279                   </td>
 280 <td>
 281                     <p>
 282                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">*</span>
 283                       <span class="identifier">y</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">*</span>
 284                       <span class="identifier">i</span></code>
 285                     </p>
 286                   </td>
 287 <td>
 288                     <p>
 289                       <code class="computeroutput"><span class="identifier">T</span></code>
 290                     </p>
 291                   </td>
 292 </tr>
 293 <tr>
 294 <td>
 295                     <p>
 296                       Division
 297                     </p>
 298                   </td>
 299 <td>
 300                     <p>
 301                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">/</span>
 302                       <span class="identifier">y</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">/</span>
 303                       <span class="identifier">i</span></code>
 304                     </p>
 305                   </td>
 306 <td>
 307                     <p>
 308                       <code class="computeroutput"><span class="identifier">T</span></code>
 309                     </p>
 310                   </td>
 311 </tr>
 312 <tr>
 313 <td>
 314                     <p>
 315                       Mixed equality
 316                     </p>
 317                   </td>
 318 <td>
 319                     <p>
 320                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">==</span>
 321                       <span class="identifier">i</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">!=</span>
 322                       <span class="identifier">i</span></code>
 323                     </p>
 324                   </td>
 325 <td>
 326                     <p>
 327                       <code class="computeroutput"><span class="keyword">bool</span></code>
 328                     </p>
 329                   </td>
 330 </tr>
 331 <tr>
 332 <td>
 333                     <p>
 334                       Mixed ordering
 335                     </p>
 336                   </td>
 337 <td>
 338                     <p>
 339                       <code class="computeroutput"><span class="identifier">x</span> <span class="special">&lt;</span>
 340                       <span class="identifier">i</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">&gt;</span>
 341                       <span class="identifier">i</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">&lt;=</span>
 342                       <span class="identifier">i</span></code><br> <code class="computeroutput"><span class="identifier">x</span> <span class="special">&gt;=</span>
 343                       <span class="identifier">i</span></code>
 344                     </p>
 345                   </td>
 346 <td>
 347                     <p>
 348                       <code class="computeroutput"><span class="keyword">bool</span></code>
 349                     </p>
 350                   </td>
 351 </tr>
 352 </tbody>
 353 </table></div>
 354 <h5>
 355 <a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.h5"></a>
 356             <span class="phrase"><a name="boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.invariants"></a></span><a class="link" href="customizing_for_tolerance.html#boost_test.testing_tools.extended_comparison.floating_point.customizing_for_tolerance.invariants">Invariants</a>
 357           </h5>
 358 <div class="informaltable"><table class="table">
 359 <colgroup>
 360 <col>
 361 <col>
 362 </colgroup>
 363 <tbody><tr>
 364 <td>
 365                     <p>
 366                       <code class="computeroutput"><span class="identifier">T</span></code> and <code class="computeroutput"><span class="keyword">int</span></code> consistency
 367                     </p>
 368                   </td>
 369 <td>
 370                     <p>
 371                       <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span>
 372                       <span class="special">==</span> <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span>
 373                       <span class="special">(</span><span class="identifier">x</span>
 374                       <span class="special">==</span> <span class="identifier">i</span><span class="special">)</span></code><br> <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span> <span class="special">!=</span>
 375                       <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span>
 376                       <span class="special">==</span> <span class="special">(</span><span class="identifier">x</span> <span class="special">!=</span>
 377                       <span class="identifier">i</span><span class="special">)</span></code><br>
 378                       <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span>
 379                       <span class="special">&lt;</span> <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span>
 380                       <span class="special">(</span><span class="identifier">x</span>
 381                       <span class="special">&lt;</span> <span class="identifier">i</span><span class="special">)</span></code><br> <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span> <span class="special">&gt;</span>
 382                       <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span>
 383                       <span class="special">==</span> <span class="special">(</span><span class="identifier">x</span> <span class="special">&gt;</span>
 384                       <span class="identifier">i</span><span class="special">)</span></code><br>
 385                       <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span>
 386                       <span class="special">/</span> <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span>
 387                       <span class="special">(</span><span class="identifier">x</span>
 388                       <span class="special">/</span> <span class="identifier">i</span><span class="special">)</span></code><br> <code class="computeroutput"><span class="special">(</span><span class="identifier">x</span> <span class="special">*</span>
 389                       <span class="identifier">T</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span>
 390                       <span class="special">==</span> <span class="special">(</span><span class="identifier">x</span> <span class="special">*</span>
 391                       <span class="identifier">i</span><span class="special">)</span></code>
 392                     </p>
 393                   </td>
 394 </tr></tbody>
 395 </table></div>
 396 </div>
 397 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 398 <td align="left"></td>
 399 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
 400       contributors<p>
 401         Distributed under the Boost Software License, Version 1.0. (See accompanying
 402         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>)
 403       </p>
 404 </div></td>
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