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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_test.testing_tools.internal_details"></a><a class="link" href="internal_details.html" title="BOOST_TEST: details on expressions"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code>: details on expressions</a>
  28 </h3></div></div></div>
  29 <p>
  30         Let's consider the following example:
  31       </p>
  32 <h6>
  33 <a name="boost_test.testing_tools.internal_details.h0"></a>
  34         <span class="phrase"><a name="boost_test.testing_tools.internal_details.example_descr"></a></span><a class="link" href="internal_details.html#boost_test.testing_tools.internal_details.example_descr">Example:
  35         BOOST_TEST reporting</a>
  36       </h6>
  37 <div class="informaltable"><table class="table">
  38 <colgroup><col></colgroup>
  39 <thead><tr><th>
  40                 <p>
  41                   Code
  42                 </p>
  43               </th></tr></thead>
  44 <tbody><tr><td>
  45 <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">boost_test_macro3</span>
  46 <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>
  47
  48 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_op_reportings</span> <span class="special">)</span>
  49 <span class="special">{</span>
  50   <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">13</span><span class="special">,</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">12</span><span class="special">;</span>
  51   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span><span class="special">);</span>
  52   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span><span class="special">);</span>
  53   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span> <span class="special">-</span> <span class="number">1</span> <span class="special">&lt;</span> <span class="identifier">b</span><span class="special">);</span>
  54   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">b</span> <span class="special">&gt;</span> <span class="identifier">a</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span>
  55 <span class="special">}</span>
  56 </pre>
  57               </td></tr></tbody>
  58 </table></div>
  59 <div class="informaltable"><table class="table">
  60 <colgroup><col></colgroup>
  61 <thead><tr><th>
  62                 <p>
  63                   Output
  64                 </p>
  65               </th></tr></thead>
  66 <tbody><tr><td>
  67 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="special">./</span><span class="identifier">boost_test_macro3</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
  68 <span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
  69 <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"boost_test_macro3"</span>
  70 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">12</span><span class="special">):</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test_op_reportings"</span>
  71 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">15</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_reportings"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">13</span> <span class="special">!=</span> <span class="number">12</span><span class="special">]</span>
  72 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">16</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_reportings"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">13</span> <span class="special">&gt;=</span> <span class="number">12</span><span class="special">]</span>
  73 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">17</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_reportings"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">a</span> <span class="special">-</span> <span class="number">1</span> <span class="special">&lt;</span> <span class="identifier">b</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">13</span> <span class="special">-</span> <span class="number">1</span> <span class="special">&gt;=</span> <span class="number">12</span><span class="special">]</span>
  74 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">18</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_reportings"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">b</span> <span class="special">&gt;</span> <span class="identifier">a</span> <span class="special">-</span> <span class="number">1</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">12</span> <span class="special">&lt;=</span> <span class="number">12</span><span class="special">]</span>
  75 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">12</span><span class="special">):</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test_op_reportings"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">484u</span><span class="identifier">s</span>
  76 <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"boost_test_macro3"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">588u</span><span class="identifier">s</span>
  77
  78 <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">"boost_test_macro3"</span>
  79 </pre>
  80               </td></tr></tbody>
  81 </table></div>
  82 <p>
  83         It was already mentioned that the reporting is not symmetrical (see <a class="link" href="reports.html" title="Reported information">here</a>). An expression is
  84         constructed from the <code class="computeroutput"><span class="identifier">statement</span></code>
  85         appearing in the <code class="computeroutput"><span class="identifier">BOOST_TEST</span></code>
  86         macro. This expression allows evaluation and reporting such as <code class="computeroutput"><span class="string">"13 - 1 &gt;= 12"</span> <span class="identifier">failed</span></code>
  87         along with a copy of the <code class="computeroutput"><span class="identifier">statement</span></code>,
  88         which contains more details than <code class="computeroutput"><span class="string">"a - 1
  89         &lt; b"</span> <span class="identifier">failed</span></code>. In
  90         details, what happens is the following:
  91       </p>
  92 <div class="orderedlist"><ol class="orderedlist" type="1">
  93 <li class="listitem">
  94 <p class="simpara">
  95             a special object, the <code class="computeroutput"><span class="identifier">seed</span></code>
  96             of the expression, is composed from the left side of <code class="computeroutput"><span class="identifier">statement</span></code>.
  97             This initial composition has highest precedence over the supported operations.
  98             The expression below:
  99           </p>
 100 <pre class="programlisting"><span class="identifier">a</span> <span class="identifier">op1</span> <span class="identifier">b</span> <span class="identifier">op2</span> <span class="identifier">c</span> <span class="identifier">op3</span> <span class="identifier">d</span>
 101 </pre>
 102 <p class="simpara">
 103             is actually seen as
 104           </p>
 105 <pre class="programlisting"><span class="special">(</span> <span class="identifier">seed</span> <span class="identifier">a</span> <span class="special">)</span> <span class="identifier">op1</span> <span class="identifier">b</span> <span class="identifier">op2</span> <span class="identifier">c</span> <span class="identifier">op3</span> <span class="identifier">d</span>
 106 </pre>
 107 </li>
 108 <li class="listitem">
 109 <p class="simpara">
 110             The "<code class="computeroutput"><span class="identifier">seed</span> <span class="identifier">a</span></code>"
 111             returns an <code class="computeroutput"><span class="identifier">expression</span></code>
 112             object that keep tracks of the type of <code class="computeroutput"><span class="identifier">a</span></code>.
 113             This expression has overloads for left-to-right associativity, and the
 114             operations <code class="computeroutput"><span class="identifier">op1</span></code>, <code class="computeroutput"><span class="identifier">op2</span></code> ... are <span class="emphasis"><em>chained</em></span>
 115             to the right of this expression object:
 116           </p>
 117 <pre class="programlisting"><span class="identifier">a</span> <span class="identifier">op1</span> <span class="identifier">b</span>
 118 </pre>
 119 <p class="simpara">
 120             yields to the pseudo-code
 121           </p>
 122 <pre class="programlisting"><span class="identifier">expression1</span> <span class="special">=</span> <span class="identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span>
 123 <span class="identifier">expression2</span> <span class="special">=</span> <span class="identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">expression1</span><span class="special">,</span> <span class="identifier">op1</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)</span>
 124 </pre>
 125 <p class="simpara">
 126             <code class="computeroutput"><span class="identifier">expression1</span></code> and <code class="computeroutput"><span class="identifier">expression2</span></code> keep track of their left
 127             and right operands, and the operation on those operands. The expressions
 128             keep also track of the result type of the associated sub-expression.
 129             In the above example, <code class="computeroutput"><span class="identifier">expression1</span></code>
 130             and <code class="computeroutput"><span class="identifier">expression2</span></code> have
 131             result type <code class="computeroutput"><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span></code>
 132             and <code class="computeroutput"><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">a</span> <span class="identifier">op1</span>
 133             <span class="identifier">b</span><span class="special">)</span></code>
 134             respectively. The result type allows for chaining sub-expressions.
 135           </p>
 136 </li>
 137 <li class="listitem">
 138 <p class="simpara">
 139             The C++ operators precedence rules apply in any case. What is seen by
 140             the expression is what is reachable with left-to-right composition. Any
 141             other operation that happens before it reaches the expression's right
 142             operand is not parsed as a sub-expression and is seen as a single operand:
 143             the right operand is not developed further by the framework. Let's suppose
 144             <code class="computeroutput"><span class="identifier">op2</span></code> below has higher
 145             precedence than <code class="computeroutput"><span class="identifier">op1</span></code>,
 146             then
 147           </p>
 148 <pre class="programlisting"><span class="identifier">a</span> <span class="identifier">op1</span> <span class="identifier">b</span> <span class="identifier">op2</span> <span class="identifier">c</span>
 149 </pre>
 150 <p class="simpara">
 151             is equivalent to:
 152           </p>
 153 <pre class="programlisting"><span class="identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">a</span><span class="special">),</span> <span class="identifier">op1</span><span class="special">,</span> <span class="special">(</span><span class="identifier">b</span> <span class="identifier">op2</span> <span class="identifier">c</span><span class="special">))</span>
 154 </pre>
 155 <p class="simpara">
 156             In the above statement, the final expression can only see the result
 157             of <code class="computeroutput"><span class="special">(</span><span class="identifier">b</span>
 158             <span class="identifier">op2</span> <span class="identifier">c</span><span class="special">)</span></code> to its right, for which no further detail
 159             can be provided in the logs. This is also the case for <span class="emphasis"><em>right-to-left</em></span>
 160             associative operators, such as <code class="computeroutput"><span class="special">!</span></code>,
 161             <code class="computeroutput"><span class="special">~</span></code>, <code class="computeroutput"><span class="special">-</span></code>
 162             (unary negation) etc.
 163           </p>
 164 <div class="caution"><table border="0" summary="Caution">
 165 <tr>
 166 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../../../doc/src/images/caution.png"></td>
 167 <th align="left">Caution</th>
 168 </tr>
 169 <tr><td align="left" valign="top"><p>
 170               Since the <code class="computeroutput"><span class="identifier">expression</span></code>
 171               object is composed from left-to-right, it actually observes a chain
 172               of operations and not the full expression tree.
 173             </p></td></tr>
 174 </table></div>
 175 </li>
 176 <li class="listitem">
 177 <p class="simpara">
 178             Once the full expression chain is built, it is evaluated as a chain of
 179             sub-expressions from left-to-right, exactly as the composition rule above.
 180             The evaluated elements are the ones of the expression itself. The expression
 181           </p>
 182 <pre class="programlisting"><span class="identifier">a</span> <span class="identifier">op1</span> <span class="identifier">b</span>
 183 </pre>
 184 <p class="simpara">
 185             yields to the following evaluation chain:
 186           </p>
 187 <pre class="programlisting"><span class="identifier">expression2</span><span class="special">.</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">expression1</span><span class="special">.</span><span class="identifier">result</span> <span class="identifier">op1</span> <span class="identifier">b</span>
 188 <span class="identifier">expression1</span><span class="special">.</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">a</span>
 189 </pre>
 190 <p class="simpara">
 191             The final expression of the statement is cast to a boolean, which is
 192             in turn evaluated by the <span class="emphasis"><em>Unit Test Framework</em></span>.
 193           </p>
 194 </li>
 195 </ol></div>
 196 <p>
 197         The example below illustrates the construction of the left-to-right <span class="emphasis"><em>chained</em></span>
 198         expression.
 199       </p>
 200 <h6>
 201 <a name="boost_test.testing_tools.internal_details.h1"></a>
 202         <span class="phrase"><a name="boost_test.testing_tools.internal_details.example_descr0"></a></span><a class="link" href="internal_details.html#boost_test.testing_tools.internal_details.example_descr0">Example:
 203         BOOST_TEST compound statements</a>
 204       </h6>
 205 <div class="informaltable"><table class="table">
 206 <colgroup><col></colgroup>
 207 <thead><tr><th>
 208                 <p>
 209                   Code
 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="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">boost_test_macro2</span>
 214 <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>
 215
 216 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_op_precedence</span> <span class="special">)</span>
 217 <span class="special">{</span>
 218   <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">13</span><span class="special">,</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">c</span> <span class="special">=</span> <span class="number">12</span><span class="special">;</span>
 219   <span class="comment">// left term of == is expanded in the logs</span>
 220   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span> <span class="special">%</span> <span class="identifier">b</span> <span class="special">==</span> <span class="identifier">c</span><span class="special">);</span>
 221   <span class="comment">// right term of == is not expanded in the logs</span>
 222   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">c</span> <span class="special">%</span> <span class="identifier">b</span><span class="special">);</span>
 223 <span class="special">}</span>
 224
 225 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_op_right_associative</span> <span class="special">)</span>
 226 <span class="special">{</span>
 227   <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
 228   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
 229   <span class="identifier">BOOST_TEST</span><span class="special">(!</span><span class="identifier">a</span><span class="special">);</span>
 230   <span class="identifier">BOOST_TEST</span><span class="special">(--</span><span class="identifier">a</span><span class="special">);</span>
 231 <span class="special">}</span>
 232 </pre>
 233               </td></tr></tbody>
 234 </table></div>
 235 <div class="informaltable"><table class="table">
 236 <colgroup><col></colgroup>
 237 <thead><tr><th>
 238                 <p>
 239                   Output
 240                 </p>
 241               </th></tr></thead>
 242 <tbody><tr><td>
 243 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="special">./</span><span class="identifier">boost_test_macro2</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
 244 <span class="identifier">Running</span> <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
 245 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">16</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_precedence"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">a</span> <span class="special">%</span> <span class="identifier">b</span> <span class="special">==</span> <span class="identifier">c</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">13</span> <span class="special">%</span> <span class="number">2</span> <span class="special">!=</span> <span class="number">12</span><span class="special">]</span>
 246 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">18</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_precedence"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">a</span> <span class="special">==</span> <span class="identifier">c</span> <span class="special">%</span> <span class="identifier">b</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">13</span> <span class="special">!=</span> <span class="number">0</span><span class="special">]</span>
 247 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">25</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test_op_right_associative"</span><span class="special">:</span> <span class="identifier">check</span> <span class="special">!</span><span class="identifier">a</span> <span class="identifier">has</span> <span class="identifier">failed</span>
 248 <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">"test_op_right_associative"</span><span class="special">:</span> <span class="identifier">check</span> <span class="special">--</span><span class="identifier">a</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[(</span><span class="keyword">bool</span><span class="special">)</span><span class="number">0</span> <span class="identifier">is</span> <span class="keyword">false</span><span class="special">]</span>
 249
 250 <span class="special">***</span> <span class="number">4</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">"boost_test_macro2"</span>
 251 </pre>
 252               </td></tr></tbody>
 253 </table></div>
 254 </div>
 255 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 256 <td align="left"></td>
 257 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
 258       contributors<p>
 259         Distributed under the Boost Software License, Version 1.0. (See accompanying
 260         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>)
 261       </p>
 262 </div></td>
 263 </tr></table>
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