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- <div class="titlepage"><div><div><h4 class="title">
- <a name="boost_test.utf_reference.testing_tool_ref.decorator_tolerance"></a><a class="link" href="decorator_tolerance.html" title="tolerance (decorator)">tolerance
- (decorator)</a>
- </h4></div></div></div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">FPT</span><span class="special">></span>
- <span class="identifier">tolerance</span><span class="special">(</span><span class="identifier">FPT</span> <span class="identifier">eps</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">FPT</span><span class="special">></span>
- <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"><</span><span class="identifier">FPT</span><span class="special">></span> <span class="identifier">eps</span><span class="special">)</span>
- </pre>
- <p>
- Decorator <code class="computeroutput"><span class="identifier">tolerance</span></code> specifies
- the default comparison tolerance for floating point type <code class="computeroutput"><span class="identifier">FTP</span></code> in the decorated test unit. The default
- tolerance only applies to a particular type, so it makes sense to provide
- more than one <code class="computeroutput"><span class="identifier">tolerance</span></code>
- decorator if we are comparing different floating point types. The variant
- with <code class="computeroutput"><span class="identifier">percent_tolerance</span></code>
- uses value
- </p>
- <pre class="programlisting"><span class="identifier">eps</span> <span class="special">/</span> <span class="number">100</span></pre>
- <p>
- as tolerance.
- </p>
- <div class="note"><table border="0" summary="Note">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
- <th align="left">Note</th>
- </tr>
- <tr><td align="left" valign="top"><p>
- For more details see the <a class="link" href="../../testing_tools/extended_comparison/floating_point.html" title="Floating point comparison">floating
- points comparison</a> section.
- </p></td></tr>
- </table></div>
- <h6>
- <a name="boost_test.utf_reference.testing_tool_ref.decorator_tolerance.h0"></a>
- <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:
- decorator tolerance</a>
- </h6>
- <div class="informaltable"><table class="table">
- <colgroup><col></colgroup>
- <thead><tr><th>
- <p>
- Code
- </p>
- </th></tr></thead>
- <tbody><tr><td>
- <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>
- <span class="preprocessor">#include</span> <span class="special"><</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">></span>
- <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>
- <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>
- <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>
- <span class="special">{</span>
- <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>
- <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>
- <span class="special">}</span>
- <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>
- <span class="special">{</span>
- <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>
- <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>
- <span class="special">}</span>
- <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>
- <span class="special">{</span>
- <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>
- <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>
- <span class="special">}</span>
- <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test4</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">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>
- <span class="special">{</span>
- <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>
- <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>
- <span class="special">}</span>
- <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test5</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">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>
- <span class="special">{</span>
- <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>
- <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>
- <span class="special">}</span>
- </pre>
- </td></tr></tbody>
- </table></div>
- <div class="informaltable"><table class="table">
- <colgroup><col></colgroup>
- <thead><tr><th>
- <p>
- Output
- </p>
- </th></tr></thead>
- <tbody><tr><td>
- <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">></span> <span class="identifier">decorator_13</span>
- <span class="identifier">Running</span> <span class="number">5</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
- <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">></span> <span class="number">0.0005</span><span class="special">]</span>
- <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">></span> <span class="number">0.0005</span><span class="special">]</span>
- <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">></span> <span class="number">0</span><span class="special">]</span>
- <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>
- <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">></span> <span class="number">0.0005</span><span class="special">]</span>
- <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">></span> <span class="number">0.0005</span><span class="special">]</span>
- <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>
- </pre>
- </td></tr></tbody>
- </table></div>
- <p>
- In the above example, in <code class="computeroutput"><span class="identifier">test1</span></code>,
- checks on <code class="computeroutput"><span class="keyword">double</span></code>s fail because
- they differ by more what tolerance for <code class="computeroutput"><span class="keyword">double</span></code>s
- specifies. In <code class="computeroutput"><span class="identifier">test2</span></code> the
- tolerance for <code class="computeroutput"><span class="keyword">double</span></code>s is greater
- and therefore the checks succeed. In <code class="computeroutput"><span class="identifier">test3</span></code>,
- we specify only tolerance for type <code class="computeroutput"><span class="keyword">float</span></code>,
- and since the checks use type <code class="computeroutput"><span class="keyword">double</span></code>
- the specified tolerance does not apply. Tolerance in <code class="computeroutput"><span class="identifier">test4</span></code>
- is equivalent to that in <code class="computeroutput"><span class="identifier">test1</span></code>,
- therefore its checks also fail. Tolerance in <code class="computeroutput"><span class="identifier">test5</span></code>
- is equivalent to that in <code class="computeroutput"><span class="identifier">test2</span></code>,
- therefore its checks also succeed.
- </p>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2001-2019 Boost.Test
- contributors<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- 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>)
- </p>
- </div></td>
- </tr></table>
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