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decorator_tolerance.html

decorator_tolerance.html 20 KB
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    24. 

  24. </div>
    25. 

  25. <div class="section">
    26. 

  26. <div class="titlepage"><div><div><h4 class="title">
    27. 

  27. <a name="boost_test.utf_reference.testing_tool_ref.decorator_tolerance"></a><a class="link" href="decorator_tolerance.html" title="tolerance (decorator)">tolerance
    28. 

  28.         (decorator)</a>
    29. 

  29. </h4></div></div></div>
    30. 

  30. <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">FPT</span><span class="special">&gt;</span>
    31. 

  31.   <span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">FPT</span> <span class="identifier">eps</span><span class="special">);</span>
    32. 

  32. 

  33. <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">FPT</span><span class="special">&gt;</span>
    34. 

  34.   <span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">test_tools</span><span class="special">::</span><span class="identifier">fpc</span><span class="special">::</span><span class="identifier">percent_tolerance_t</span><span class="special">&lt;</span><span class="identifier">FPT</span><span class="special">&gt;</span> <span class="identifier">eps</span><span class="special">)</span>
    35. 

  35. </pre>
    36. 

  36. <p>
    37. 

  37.           Decorator <code class="computeroutput"><span class="identifier">tolerance</span></code> specifies
    38. 

  38.           the default comparison tolerance for floating point type <code class="computeroutput"><span class="identifier">FTP</span></code> in the decorated test unit. The default
    39. 

  39.           tolerance only applies to a particular type, so it makes sense to provide
    40. 

  40.           more than one <code class="computeroutput"><span class="identifier">tolerance</span></code>
    41. 

  41.           decorator if we are comparing different floating point types. The variant
    42. 

  42.           with <code class="computeroutput"><span class="identifier">percent_tolerance</span></code>
    43. 

  43.           uses value
    44. 

  44.         </p>
    45. 

  45. <pre class="programlisting"><span class="identifier">eps</span> <span class="special">/</span> <span class="number">100</span></pre>
    46. 

  46. <p>
    47. 

  47.           as tolerance.
    48. 

  48.         </p>
    49. 

  49. <div class="note"><table border="0" summary="Note">
    50. 

  50. <tr>
    51. 

  51. <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
    52. 

  52. <th align="left">Note</th>
    53. 

  53. </tr>
    54. 

  54. <tr><td align="left" valign="top"><p>
    55. 

  55.             For more details see the <a class="link" href="../../testing_tools/extended_comparison/floating_point.html" title="Floating point comparison">floating
    56. 

  56.             points comparison</a> section.
    57. 

  57.           </p></td></tr>
    58. 

  58. </table></div>
    59. 

  59. <h6>
    60. 

  60. <a name="boost_test.utf_reference.testing_tool_ref.decorator_tolerance.h0"></a>
    61. 

  61.           <span class="phrase"><a name="boost_test.utf_reference.testing_tool_ref.decorator_tolerance.example_descr"></a></span><a class="link" href="decorator_tolerance.html#boost_test.utf_reference.testing_tool_ref.decorator_tolerance.example_descr">Example:
    62. 

  62.           decorator tolerance</a>
    63. 

  63.         </h6>
    64. 

  64. <div class="informaltable"><table class="table">
    65. 

  65. <colgroup><col></colgroup>
    66. 

  66. <thead><tr><th>
    67. 

  67.                   <p>
    68. 

  68.                     Code
    69. 

  69.                   </p>
    70. 

  70.                 </th></tr></thead>
    71. 

  71. <tbody><tr><td>
    72. 

  72. <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">decorator_13</span>
    73. 

  73. <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>
    74. 

  74. 

  75. <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>
    76. 

  76. <span class="keyword">namespace</span> <span class="identifier">fpc</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">test_tools</span><span class="special">::</span><span class="identifier">fpc</span><span class="special">;</span>
    77. 

  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="number">0.0005</span><span class="special">))</span>
    79. 

  79. <span class="special">{</span>
    80. 

  80.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="special">);</span>
    81. 

  81.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="special">);</span>
    82. 

  82. <span class="special">}</span>
    83. 

  83. 

  84. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test2</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="number">0.005</span><span class="special">))</span>
    85. 

  85. <span class="special">{</span>
    86. 

  86.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="special">);</span>
    87. 

  87.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="special">);</span>
    88. 

  88. <span class="special">}</span>
    89. 

  89. 

  90. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test3</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="number">0.05F</span><span class="special">))</span>
    91. 

  91. <span class="special">{</span>
    92. 

  92.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="special">);</span>
    93. 

  93.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="special">);</span>
    94. 

  94. <span class="special">}</span>
    95. 

  95. 

  96. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test4</span><span class="special">,</span>
    97. 

  97.   <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">fpc</span><span class="special">::</span><span class="identifier">percent_tolerance</span><span class="special">(</span><span class="number">0.05</span><span class="special">)))</span>
    98. 

  98. <span class="special">{</span>
    99. 

  99.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="special">);</span>
    100. 

  100.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="special">);</span>
    101. 

  101. <span class="special">}</span>
    102. 

  102. 

  103. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test5</span><span class="special">,</span>
    104. 

  104.   <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">fpc</span><span class="special">::</span><span class="identifier">percent_tolerance</span><span class="special">(</span><span class="number">0.5</span><span class="special">)))</span>
    105. 

  105. <span class="special">{</span>
    106. 

  106.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="special">);</span>
    107. 

  107.   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="special">);</span>
    108. 

  108. <span class="special">}</span>
    109. 

  109. </pre>
    110. 

  110.                 </td></tr></tbody>
    111. 

  111. </table></div>
    112. 

  112. <div class="informaltable"><table class="table">
    113. 

  113. <colgroup><col></colgroup>
    114. 

  114. <thead><tr><th>
    115. 

  115.                   <p>
    116. 

  116.                     Output
    117. 

  117.                   </p>
    118. 

  118.                 </th></tr></thead>
    119. 

  119. <tbody><tr><td>
    120. 

  120. <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">decorator_13</span>
    121. 

  121. <span class="identifier">Running</span> <span class="number">5</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
    122. 

  122. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">9</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="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">0.001</span> <span class="special">!=</span> <span class="number">0</span><span class="special">].</span> <span class="identifier">Absolute</span> <span class="identifier">value</span> <span class="identifier">exceeds</span> <span class="identifier">tolerance</span> <span class="special">[|</span><span class="number">0.001</span><span class="special">|</span> <span class="special">&gt;</span> <span class="number">0.0005</span><span class="special">]</span>
    123. 

  123. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">10</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="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">1.1000000000000001</span> <span class="special">!=</span> <span class="number">1.101</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">0.000908265</span> <span class="special">&gt;</span> <span class="number">0.0005</span><span class="special">]</span>
    124. 

  124. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">21</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test3"</span><span class="special">:</span> <span class="identifier">check</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">0.001</span> <span class="special">!=</span> <span class="number">0</span><span class="special">].</span> <span class="identifier">Absolute</span> <span class="identifier">value</span> <span class="identifier">exceeds</span> <span class="identifier">tolerance</span> <span class="special">[|</span><span class="number">0.001</span><span class="special">|</span> <span class="special">&gt;</span> <span class="number">0</span><span class="special">]</span>
    125. 

  125. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">22</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test3"</span><span class="special">:</span> <span class="identifier">check</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">1.1000000000000001</span> <span class="special">!=</span> <span class="number">1.101</span><span class="special">]</span>
    126. 

  126. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">28</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test4"</span><span class="special">:</span> <span class="identifier">check</span> <span class="number">0.001</span> <span class="special">==</span> <span class="number">0.000</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">0.001</span> <span class="special">!=</span> <span class="number">0</span><span class="special">].</span> <span class="identifier">Absolute</span> <span class="identifier">value</span> <span class="identifier">exceeds</span> <span class="identifier">tolerance</span> <span class="special">[|</span><span class="number">0.001</span><span class="special">|</span> <span class="special">&gt;</span> <span class="number">0.0005</span><span class="special">]</span>
    127. 

  127. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">29</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test4"</span><span class="special">:</span> <span class="identifier">check</span> <span class="number">1.100</span> <span class="special">==</span> <span class="number">1.101</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">1.1000000000000001</span> <span class="special">!=</span> <span class="number">1.101</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">0.000908265</span> <span class="special">&gt;</span> <span class="number">0.0005</span><span class="special">]</span>
    128. 

  128. 

  129. <span class="special">***</span> <span class="number">6</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">"decorator_13"</span>
    130. 

  130. </pre>
    131. 

  131.                 </td></tr></tbody>
    132. 

  132. </table></div>
    133. 

  133. <p>
    134. 

  134.           In the above example, in <code class="computeroutput"><span class="identifier">test1</span></code>,
    135. 

  135.           checks on <code class="computeroutput"><span class="keyword">double</span></code>s fail because
    136. 

  136.           they differ by more what tolerance for <code class="computeroutput"><span class="keyword">double</span></code>s
    137. 

  137.           specifies. In <code class="computeroutput"><span class="identifier">test2</span></code> the
    138. 

  138.           tolerance for <code class="computeroutput"><span class="keyword">double</span></code>s is greater
    139. 

  139.           and therefore the checks succeed. In <code class="computeroutput"><span class="identifier">test3</span></code>,
    140. 

  140.           we specify only tolerance for type <code class="computeroutput"><span class="keyword">float</span></code>,
    141. 

  141.           and since the checks use type <code class="computeroutput"><span class="keyword">double</span></code>
    142. 

  142.           the specified tolerance does not apply. Tolerance in <code class="computeroutput"><span class="identifier">test4</span></code>
    143. 

  143.           is equivalent to that in <code class="computeroutput"><span class="identifier">test1</span></code>,
    144. 

  144.           therefore its checks also fail. Tolerance in <code class="computeroutput"><span class="identifier">test5</span></code>
    145. 

  145.           is equivalent to that in <code class="computeroutput"><span class="identifier">test2</span></code>,
    146. 

  146.           therefore its checks also succeed.
    147. 

  147.         </p>
    148. 

  148. </div>
    149. 

  149. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    150. 

  150. <td align="left"></td>
    151. 

  151. <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
    152. 

  152.       contributors<p>
    153. 

  153.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    154. 

  154.         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>)
    155. 

  155.       </p>
    156. 

  156. </div></td>
    157. 

  157. </tr></table>
    158. 

  158. <hr>
    159. 

  159. <div class="spirit-nav">
    160. 

  160. <a accesskey="p" href="decorator_timeout.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../testing_tool_ref.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="assertion_boost_level.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a>
    161. 

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    162. 

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    163. 

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    164.