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- <title>Logging user defined types</title>
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- <div class="titlepage"><div><div><h4 class="title">
- <a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable"></a><a class="link" href="testing_tool_output_disable.html" title="Logging user defined types">Logging
- user defined types</a>
- </h4></div></div></div>
- <p>
- Most of the <a class="link" href="../../testing_tools.html" title="Writing unit tests">testing tools</a>
- print values of their arguments to the output stream in some form of log
- statement. If arguments type does not support
- </p>
- <pre class="programlisting"><span class="keyword">operator</span><span class="special"><<(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&,</span> <span class="identifier">ArgumentType</span> <span class="keyword">const</span><span class="special">&);</span>
- </pre>
- <p>
- interface, you will get a compilation error.
- </p>
- <p>
- The <span class="emphasis"><em>Unit Test Framework</em></span> supports three different methods
- for logging user defined types:
- </p>
- <div class="orderedlist"><ol class="orderedlist" type="1">
- <li class="listitem">
- through the <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>
- for that specific type: any type that implements the above interface
- has direct support for logging,
- </li>
- <li class="listitem">
- through a customization point responsible for logging a specific type,
- which is less intrusive than the implementation of <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>. This is explained in more
- details in <a class="link" href="testing_tool_output_disable.html#ref_log_output_custom_customization_point">this
- section</a>,
- </li>
- <li class="listitem">
- by prohibiting the <a class="link" href="../../testing_tools.html" title="Writing unit tests">testing
- tools</a> from logging argument values for specified type through
- <a class="link" href="../../utf_reference/testout_reference/test_output_macro_disable_type.html" title="BOOST_TEST_DONT_PRINT_LOG_VALUE"><code class="computeroutput"><span class="identifier">BOOST_TEST_DONT_PRINT_LOG_VALUE</span></code></a>.
- This is explained in more details in <a class="link" href="testing_tool_output_disable.html#ref_log_output_custom_avoid_printing">this
- section</a>.
- </li>
- </ol></div>
- <a name="ref_log_output_custom_customization_point"></a><h5>
- <a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.h0"></a>
- <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.user_type_customization_point_fo"></a></span><a class="link" href="testing_tool_output_disable.html#boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.user_type_customization_point_fo">User
- type customization point for logging</a>
- </h5>
- <p>
- It is possible to indicate a function, <code class="computeroutput"><span class="identifier">boost_test_print_type</span></code>,
- to <span class="emphasis"><em>Unit Test Framework</em></span> that is responsible for the
- printing of a user defined type, without the need to override the <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>
- for that specific type. This is convenient for instance when the <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>
- has already been defined for other needs.
- </p>
- <p>
- The syntax follows the <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>, and this function should be in
- the same namespace as the type:
- </p>
- <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">boost_test_print_type</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">ostr</span><span class="special">,</span> <span class="identifier">ArgumentType</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">);</span>
- </pre>
- <h6>
- <a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.h1"></a>
- <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.example_descr"></a></span><a class="link" href="testing_tool_output_disable.html#boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.example_descr">Example:
- Logging customization point usage</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">logger</span><span class="special">-</span><span class="identifier">customization</span><span class="special">-</span><span class="identifier">point</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">user_defined_namespace</span> <span class="special">{</span>
- <span class="keyword">struct</span> <span class="identifier">user_defined_type</span> <span class="special">{</span>
- <span class="keyword">int</span> <span class="identifier">value</span><span class="special">;</span>
- <span class="identifier">user_defined_type</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">value_</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">value</span><span class="special">(</span><span class="identifier">value_</span><span class="special">)</span>
- <span class="special">{}</span>
- <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">int</span> <span class="identifier">right</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span>
- <span class="keyword">return</span> <span class="identifier">right</span> <span class="special">==</span> <span class="identifier">value</span><span class="special">;</span>
- <span class="special">}</span>
- <span class="special">};</span>
- <span class="special">}</span>
- <span class="keyword">namespace</span> <span class="identifier">user_defined_namespace</span> <span class="special">{</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">boost_test_print_type</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">ostr</span><span class="special">,</span> <span class="identifier">user_defined_type</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span>
- <span class="identifier">ostr</span> <span class="special"><<</span> <span class="string">"** value of user_defined_type is "</span> <span class="special"><<</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">value</span> <span class="special"><<</span> <span class="string">" **"</span><span class="special">;</span>
- <span class="keyword">return</span> <span class="identifier">ostr</span><span class="special">;</span>
- <span class="special">}</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">user_defined_namespace</span><span class="special">::</span><span class="identifier">user_defined_type</span> <span class="identifier">t</span><span class="special">(</span><span class="number">10</span><span class="special">);</span>
- <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">t</span> <span class="special">==</span> <span class="number">11</span><span class="special">);</span>
- <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">user_defined_namespace</span><span class="special">;</span>
- <span class="identifier">user_defined_type</span> <span class="identifier">t2</span><span class="special">(</span><span class="number">11</span><span class="special">);</span>
- <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">t2</span> <span class="special">==</span> <span class="number">11</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">logger</span><span class="special">-</span><span class="identifier">customization</span><span class="special">-</span><span class="identifier">point</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
- <span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
- <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"logger-customization-point"</span>
- <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">36</span><span class="special">):</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test1"</span>
- <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">39</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">t</span> <span class="special">==</span> <span class="number">11</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[**</span> <span class="identifier">value</span> <span class="identifier">of</span> <span class="identifier">user_defined_type</span> <span class="identifier">is</span> <span class="number">10</span> <span class="special">**</span> <span class="special">!=</span> <span class="number">11</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">43</span><span class="special">):</span> <span class="identifier">info</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">t2</span> <span class="special">==</span> <span class="number">11</span> <span class="identifier">has</span> <span class="identifier">passed</span>
- <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">36</span><span class="special">):</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test1"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">125u</span><span class="identifier">s</span>
- <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"logger-example-customization-point"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">157u</span><span class="identifier">s</span>
- <span class="special">***</span> <span class="number">1</span> <span class="identifier">failure</span> <span class="identifier">is</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">"logger-customization-point"</span>
- </pre>
- </td></tr></tbody>
- </table></div>
- <a name="ref_log_output_custom_avoid_printing"></a><h5>
- <a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.h2"></a>
- <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.prohibiting_the_printing_of_a_sp"></a></span><a class="link" href="testing_tool_output_disable.html#boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.prohibiting_the_printing_of_a_sp">Prohibiting
- the printing of a specific type</a>
- </h5>
- <p>
- To prohibit the printing of a specific type, use the following statement
- on file level before first test case that includes statement failing to
- compile:
- </p>
- <pre class="programlisting"><span class="identifier">BOOST_TEST_DONT_PRINT_LOG_VALUE</span><span class="special">(</span><span class="identifier">ArgumentType</span><span class="special">)</span>
- </pre>
- <h6>
- <a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.h3"></a>
- <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.example_descr0"></a></span><a class="link" href="testing_tool_output_disable.html#boost_test.test_output.test_tools_support_for_logging.testing_tool_output_disable.example_descr0">Example:
- BOOST_TEST_DONT_PRINT_LOG_VALUE usage</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">example</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="preprocessor">#include</span> <span class="special"><</span><span class="identifier">utility</span><span class="special">></span>
- <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">pair_type</span><span class="special">;</span>
- <span class="identifier">BOOST_TEST_DONT_PRINT_LOG_VALUE</span><span class="special">(</span> <span class="identifier">pair_type</span> <span class="special">)</span>
- <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_list</span> <span class="special">)</span>
- <span class="special">{</span>
- <span class="identifier">pair_type</span> <span class="identifier">p1</span><span class="special">(</span> <span class="number">2</span><span class="special">,</span> <span class="number">5.5f</span> <span class="special">);</span>
- <span class="identifier">pair_type</span> <span class="identifier">p2</span><span class="special">(</span> <span class="number">2</span><span class="special">,</span> <span class="number">5.501f</span> <span class="special">);</span>
- <span class="identifier">BOOST_CHECK_EQUAL</span><span class="special">(</span> <span class="identifier">p1</span><span class="special">,</span> <span class="identifier">p2</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="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</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">16</span><span class="special">):</span> <span class="identifier">error</span> <span class="identifier">in</span> <span class="string">"test_list"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">p1</span> <span class="special">==</span> <span class="identifier">p2</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span> <span class="special">!=</span> <span class="special">]</span>
- <span class="special">***</span> <span class="number">1</span> <span class="identifier">failures</span> <span class="identifier">is</span> <span class="identifier">detected</span> <span class="identifier">in</span> <span class="identifier">test</span> <span class="identifier">suite</span> <span class="string">"example"</span>
- </pre>
- </td></tr></tbody>
- </table></div>
- </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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