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  25 <div class="section">
  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="boost_test.tests_organization.test_cases.test_case_generation.datasets"></a><a class="link" href="datasets.html" title="Datasets">Datasets</a>
  28 </h5></div></div></div>
  29 <p>
  30             To define properly datasets, the notion of <span class="bold"><strong>sample</strong></span>
  31             should be introduced first. A <span class="bold"><strong>sample</strong></span>
  32             is defined as <span class="emphasis"><em>polymorphic tuple</em></span>. The size of the
  33             tuple will be by definition the <span class="bold"><strong>arity</strong></span>
  34             of the sample itself.
  35           </p>
  36 <p>
  37             A <span class="bold"><strong>dataset</strong></span> is a <span class="emphasis"><em>collection
  38             of samples</em></span>, that
  39           </p>
  40 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  41 <li class="listitem">
  42                 is forward iterable,
  43               </li>
  44 <li class="listitem">
  45                 can be queried for its <code class="computeroutput"><span class="identifier">size</span></code>
  46                 which in turn can be infinite,
  47               </li>
  48 <li class="listitem">
  49                 has an arity which is the arity of the samples it contains.
  50               </li>
  51 </ul></div>
  52 <p>
  53             Hence the dataset implements the notion of <span class="emphasis"><em>sequence</em></span>.
  54           </p>
  55 <p>
  56             The descriptive power of the datasets in <span class="emphasis"><em>Unit Test Framework</em></span>
  57             comes from
  58           </p>
  59 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  60 <li class="listitem">
  61                 the <a class="link" href="datasets.html#boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface" title="Dataset interface">interface</a>
  62                 for creating a custom datasets, which is quite simple,
  63               </li>
  64 <li class="listitem">
  65                 the <a class="link" href="operations.html" title="Operations on dataset">operations</a>
  66                 they provide for combining different datasets
  67               </li>
  68 <li class="listitem">
  69                 their interface with other type of collections (<code class="computeroutput"><span class="identifier">stl</span></code>
  70                 containers, <code class="computeroutput"><span class="identifier">C</span></code> arrays)
  71               </li>
  72 <li class="listitem">
  73                 the available built-in <a class="link" href="generators.html" title="Datasets generators"><span class="emphasis"><em>dataset
  74                 generators</em></span></a>
  75               </li>
  76 </ul></div>
  77 <div class="tip"><table border="0" summary="Tip">
  78 <tr>
  79 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../../../doc/src/images/tip.png"></td>
  80 <th align="left">Tip</th>
  81 </tr>
  82 <tr><td align="left" valign="top"><p>
  83               Only "monomorphic" datasets are supported, which means that
  84               all samples within a single dataset have the same type and same arity
  85               <a href="#ftn.boost_test.tests_organization.test_cases.test_case_generation.datasets.f0" class="footnote" name="boost_test.tests_organization.test_cases.test_case_generation.datasets.f0"><sup class="footnote">[2]</sup></a> . However, dataset of different sample types may be combined
  86               together with zip and cartesian product.
  87             </p></td></tr>
  88 </table></div>
  89 <p>
  90             As we will see in the next sections, datasets representing collections
  91             of different types may be combined together (e.g.. <span class="emphasis"><em>zip</em></span>
  92             or <span class="emphasis"><em>grid</em></span>). These operations result in new datasets,
  93             in which the samples are of an augmented type.
  94           </p>
  95 <div class="section">
  96 <div class="titlepage"><div><div><h6 class="title">
  97 <a name="boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface"></a><a class="link" href="datasets.html#boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface" title="Dataset interface">Dataset
  98             interface</a>
  99 </h6></div></div></div>
 100 <p>
 101               The interface of the <span class="emphasis"><em>dataset</em></span> should implement
 102               the two following functions/fields:
 103             </p>
 104 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 105 <li class="listitem">
 106                   <code class="computeroutput"><span class="identifier">iterator</span> <span class="identifier">begin</span><span class="special">()</span></code> where <span class="emphasis"><em>iterator</em></span>
 107                   is a forward iterator,
 108                 </li>
 109 <li class="listitem">
 110                   <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">data</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span></code>
 111                   indicates the size of the dataset. The returned type is a dedicated
 112                   class <code class="computeroutput"><a class="link" href="../../../../boost/unit_test/data/size_t.html" title="Class size_t">size_t</a></code>
 113                   that can indicate an <span class="emphasis"><em>infinite</em></span> dataset size.
 114                 </li>
 115 <li class="listitem">
 116                   an enum called <code class="computeroutput"><span class="identifier">arity</span></code>
 117                   indicating the arity of the samples returned by the dataset
 118                 </li>
 119 </ul></div>
 120 <p>
 121               Once a dataset class <code class="computeroutput"><span class="identifier">D</span></code>
 122               is declared, it should be registered to the framework by specializing
 123               the template class
 124             </p>
 125 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">data</span><span class="special">::</span><span class="identifier">monomorphic</span><span class="special">::</span><span class="identifier">is_dataset</span></pre>
 126 <p>
 127               with the condition that
 128             </p>
 129 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">data</span><span class="special">::</span><span class="identifier">monomorphic</span><span class="special">::</span><span class="identifier">is_dataset</span><span class="special">&lt;</span><span class="identifier">D</span><span class="special">&gt;::</span><span class="identifier">value</span></pre>
 130 <p>
 131               evaluates to <code class="computeroutput"><span class="keyword">true</span></code>.
 132             </p>
 133 <p>
 134               The following example implements a custom dataset generating a Fibonacci
 135               sequence.
 136             </p>
 137 <h6>
 138 <a name="boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface.h0"></a>
 139               <span class="phrase"><a name="boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface.example_descr"></a></span><a class="link" href="datasets.html#boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_interface.example_descr">Example:
 140               Example of custom dataset</a>
 141             </h6>
 142 <div class="informaltable"><table class="table">
 143 <colgroup><col></colgroup>
 144 <thead><tr><th>
 145                       <p>
 146                         Code
 147                       </p>
 148                     </th></tr></thead>
 149 <tbody><tr><td>
 150 <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">dataset_example68</span>
 151 <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>
 152 <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">data</span><span class="special">/</span><span class="identifier">test_case</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 153 <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">data</span><span class="special">/</span><span class="identifier">monomorphic</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 154 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">sstream</span><span class="special">&gt;</span>
 155
 156 <span class="keyword">namespace</span> <span class="identifier">bdata</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">data</span><span class="special">;</span>
 157
 158 <span class="comment">// Dataset generating a Fibonacci sequence</span>
 159 <span class="keyword">class</span> <span class="identifier">fibonacci_dataset</span> <span class="special">{</span>
 160 <span class="keyword">public</span><span class="special">:</span>
 161     <span class="comment">// the type of the samples is deduced</span>
 162     <span class="keyword">enum</span> <span class="special">{</span> <span class="identifier">arity</span> <span class="special">=</span> <span class="number">1</span> <span class="special">};</span>
 163
 164     <span class="keyword">struct</span> <span class="identifier">iterator</span> <span class="special">{</span>
 165
 166         <span class="identifier">iterator</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">a</span><span class="special">(</span><span class="number">1</span><span class="special">),</span> <span class="identifier">b</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">{}</span>
 167
 168         <span class="keyword">int</span> <span class="keyword">operator</span><span class="special">*()</span> <span class="keyword">const</span>   <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">b</span><span class="special">;</span> <span class="special">}</span>
 169         <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">++()</span>
 170         <span class="special">{</span>
 171             <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">a</span> <span class="special">+</span> <span class="identifier">b</span><span class="special">;</span>
 172             <span class="identifier">std</span><span class="special">::</span><span class="identifier">swap</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">);</span>
 173         <span class="special">}</span>
 174     <span class="keyword">private</span><span class="special">:</span>
 175         <span class="keyword">int</span> <span class="identifier">a</span><span class="special">;</span>
 176         <span class="keyword">int</span> <span class="identifier">b</span><span class="special">;</span> <span class="comment">// b is the output</span>
 177     <span class="special">};</span>
 178
 179     <span class="identifier">fibonacci_dataset</span><span class="special">()</span>             <span class="special">{}</span>
 180
 181     <span class="comment">// size is infinite</span>
 182     <span class="identifier">bdata</span><span class="special">::</span><span class="identifier">size_t</span>   <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span>    <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">bdata</span><span class="special">::</span><span class="identifier">BOOST_TEST_DS_INFINITE_SIZE</span><span class="special">;</span> <span class="special">}</span>
 183
 184     <span class="comment">// iterator</span>
 185     <span class="identifier">iterator</span>        <span class="identifier">begin</span><span class="special">()</span> <span class="keyword">const</span>   <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">iterator</span><span class="special">();</span> <span class="special">}</span>
 186 <span class="special">};</span>
 187
 188 <span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">unit_test</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">data</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">monomorphic</span> <span class="special">{</span>
 189   <span class="comment">// registering fibonacci_dataset as a proper dataset</span>
 190   <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
 191   <span class="keyword">struct</span> <span class="identifier">is_dataset</span><span class="special">&lt;</span><span class="identifier">fibonacci_dataset</span><span class="special">&gt;</span> <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span> <span class="special">{};</span>
 192 <span class="special">}}}}</span>
 193
 194 <span class="comment">// Creating a test-driven dataset, the zip is for checking</span>
 195 <span class="identifier">BOOST_DATA_TEST_CASE</span><span class="special">(</span>
 196     <span class="identifier">test1</span><span class="special">,</span>
 197     <span class="identifier">fibonacci_dataset</span><span class="special">()</span> <span class="special">^</span> <span class="identifier">bdata</span><span class="special">::</span><span class="identifier">make</span><span class="special">(</span> <span class="special">{</span> <span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">5</span><span class="special">,</span> <span class="number">8</span><span class="special">,</span> <span class="number">13</span><span class="special">,</span> <span class="number">21</span><span class="special">,</span> <span class="number">35</span><span class="special">,</span> <span class="number">56</span> <span class="special">}</span> <span class="special">),</span>
 198     <span class="identifier">fib_sample</span><span class="special">,</span> <span class="identifier">exp</span><span class="special">)</span>
 199 <span class="special">{</span>
 200       <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">fib_sample</span> <span class="special">==</span> <span class="identifier">exp</span><span class="special">);</span>
 201 <span class="special">}</span>
 202 </pre>
 203                     </td></tr></tbody>
 204 </table></div>
 205 <div class="informaltable"><table class="table">
 206 <colgroup><col></colgroup>
 207 <thead><tr><th>
 208                       <p>
 209                         Output
 210                       </p>
 211                     </th></tr></thead>
 212 <tbody><tr><td>
 213 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">example68</span>
 214 <span class="identifier">Running</span> <span class="number">9</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
 215 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">60</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1/_7"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">fib_sample</span> <span class="special">==</span> <span class="identifier">exp</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">34</span> <span class="special">!=</span> <span class="number">35</span><span class="special">]</span>
 216 <span class="identifier">Failure</span> <span class="identifier">occurred</span> <span class="identifier">in</span> <span class="identifier">a</span> <span class="identifier">following</span> <span class="identifier">context</span><span class="special">:</span>
 217     <span class="identifier">fib_sample</span> <span class="special">=</span> <span class="number">34</span><span class="special">;</span> <span class="identifier">exp</span> <span class="special">=</span> <span class="number">35</span><span class="special">;</span>
 218 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">60</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1/_8"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">fib_sample</span> <span class="special">==</span> <span class="identifier">exp</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">55</span> <span class="special">!=</span> <span class="number">56</span><span class="special">]</span>
 219 <span class="identifier">Failure</span> <span class="identifier">occurred</span> <span class="identifier">in</span> <span class="identifier">a</span> <span class="identifier">following</span> <span class="identifier">context</span><span class="special">:</span>
 220     <span class="identifier">fib_sample</span> <span class="special">=</span> <span class="number">55</span><span class="special">;</span> <span class="identifier">exp</span> <span class="special">=</span> <span class="number">56</span><span class="special">;</span>
 221
 222 <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">"dataset_example68"</span>
 223 </pre>
 224                     </td></tr></tbody>
 225 </table></div>
 226 </div>
 227 <div class="section">
 228 <div class="titlepage"><div><div><h6 class="title">
 229 <a name="boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_creation_and_delayed_cre"></a><a class="link" href="datasets.html#boost_test.tests_organization.test_cases.test_case_generation.datasets.dataset_creation_and_delayed_cre" title="Dataset creation and delayed creation">Dataset
 230             creation and delayed creation</a>
 231 </h6></div></div></div>
 232 <p>
 233               Datasets as defined above are constructed before even the test module
 234               starts its execution as global objects. This makes impossible to access,
 235               from within the dataset generator and during their iteration, elements
 236               like <code class="computeroutput"><span class="identifier">argc</span></code> / <code class="computeroutput"><span class="identifier">argv</span></code>, the <a class="link" href="../../test_tree/master_test_suite.html" title="Master test suite">master
 237               test suite</a> (and the preprocessed <code class="computeroutput"><span class="identifier">argc</span></code>
 238               / <code class="computeroutput"><span class="identifier">argv</span></code>), or any other
 239               object that has been instantiated after the <code class="computeroutput"><span class="identifier">main</span></code>
 240               of the test module entry.
 241             </p>
 242 <p>
 243               To overcome this, a <span class="bold"><strong>delayed</strong></span> dataset
 244               instantiation interface has been introduced. This effectively wraps
 245               the dataset inside another one, which <span class="bold"><strong>lazyly</strong></span>
 246               instantiates the dataset.
 247             </p>
 248 <p>
 249               To instantiate a delayed dataset, the <code class="computeroutput">boost::unit_test::data::monomorphic::make_delayed</code>
 250               function should be used in the <a class="link" href="../../../utf_reference/test_org_reference/test_org_boost_test_dataset.html" title="BOOST_DATA_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_DATA_TEST_CASE</span></code></a> call.
 251               The following snippet:
 252             </p>
 253 <pre class="programlisting"><span class="identifier">BOOST_DATA_TEST_CASE</span><span class="special">(</span><span class="identifier">dataset_test_case</span><span class="special">,</span>
 254     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">data</span><span class="special">::</span><span class="identifier">make_delayed</span><span class="special">&lt;</span><span class="identifier">custom_dataset</span><span class="special">&gt;(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="special">...</span> <span class="special">),</span> <span class="special">...)</span>
 255 <span class="special">{</span>
 256 <span class="special">}</span>
 257 </pre>
 258 <p>
 259               creates a delayed dataset test case with a generator of type <code class="computeroutput"><span class="identifier">custom_dataset</span></code>. The generator is
 260               <span class="emphasis"><em>lazily</em></span> constructed with <code class="computeroutput"><span class="identifier">arg1</span></code>,
 261               <code class="computeroutput"><span class="special">...</span></code>.
 262             </p>
 263 <div class="tip"><table border="0" summary="Tip">
 264 <tr>
 265 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../../../doc/src/images/tip.png"></td>
 266 <th align="left">Tip</th>
 267 </tr>
 268 <tr><td align="left" valign="top"><p>
 269                 A detailed example of delayed creation is given in the section about
 270                 <a class="link" href="../../../runtime_config/custom_command_line_arguments.html" title="Custom command line arguments">custom
 271                 command line</a> arguments.
 272               </p></td></tr>
 273 </table></div>
 274 <div class="tip"><table border="0" summary="Tip">
 275 <tr>
 276 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../../../doc/src/images/tip.png"></td>
 277 <th align="left">Tip</th>
 278 </tr>
 279 <tr><td align="left" valign="top"><p>
 280                 See the class <code class="computeroutput"><a class="link" href="../../../../boost/unit_test/data/monomorphic/delayed_dataset.html" title="Class template delayed_dataset">monomorphic::delayed_dataset</a></code> for
 281                 more details on the wrapping object.
 282               </p></td></tr>
 283 </table></div>
 284 </div>
 285 <div class="footnotes">
 286 <br><hr style="width:100; text-align:left;margin-left: 0">
 287 <div id="ftn.boost_test.tests_organization.test_cases.test_case_generation.datasets.f0" class="footnote"><p><a href="#boost_test.tests_organization.test_cases.test_case_generation.datasets.f0" class="para"><sup class="para">[2] </sup></a>
 288                 polymorphic datasets will be considered in the future. Their need
 289                 is mainly driven by the replacement of the <a class="link" href="../test_organization_templates.html" title="Template test cases">typed
 290                 parametrized test cases</a> by the dataset-like API.
 291               </p></div>
 292 </div>
 293 </div>
 294 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 295 <td align="left"></td>
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 299         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>)
 300       </p>
 301 </div></td>
 302 </tr></table>
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