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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.test_output.test_tools_support_for_logging.test_output_macro_message"></a><a class="link" href="test_output_macro_message.html" title="Custom messages">Custom
        messages</a>
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<p>
          The macro <a class="link" href="../../utf_reference/testout_reference/test_output_macro_message.html" title="BOOST_TEST_MESSAGE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MESSAGE</span></code></a> is intended
          to be used for the purpose of injecting an additional message into the
          <span class="emphasis"><em>Unit Test Framework</em></span> test log. These messages are not
          intended to indicate any error or warning conditions, but rather as information/status
          notifications. The macro signature is as follows:
        </p>
<pre class="programlisting"><a class="link" href="../../utf_reference/testout_reference/test_output_macro_message.html" title="BOOST_TEST_MESSAGE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MESSAGE</span></code></a><span class="special">(</span><span class="identifier">test_message</span><span class="special">);</span>
</pre>
<p>
          The test_message argument can be as simple as C string literal or any custom
          expression that you can produce with in a manner similar to standard <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iostream</span></code> operation.
        </p>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../../../../doc/src/images/important.png"></td>
<th align="left">Important</th>
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<tr><td align="left" valign="top"><p>
            Messages generated by this tool do not appear in test log output with
            default value of the active log level threshold. For these messages to
            appear the active log level threshold has to be set to a value below
            or equal to "message".
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<h6>
<a name="boost_test.test_output.test_tools_support_for_logging.test_output_macro_message.h0"></a>
          <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.test_output_macro_message.example_descr"></a></span><a class="link" href="test_output_macro_message.html#boost_test.test_output.test_tools_support_for_logging.test_output_macro_message.example_descr">Example:
          <code class="computeroutput"><span class="identifier">BOOST_TEST_MESSAGE</span></code> usage</a>
        </h6>
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<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">&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>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_init</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">int</span> <span class="identifier">current_time</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="comment">// real call is required here</span>

  <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"Testing initialization :"</span> <span class="special">);</span>
  <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"Current time:"</span> <span class="special">&lt;&lt;</span> <span class="identifier">current_time</span> <span class="special">);</span>
<span class="special">}</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_update</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">field_name</span> <span class="special">=</span> <span class="string">"Volume"</span><span class="special">;</span>
  <span class="keyword">int</span>         <span class="identifier">value</span>      <span class="special">=</span> <span class="number">100</span><span class="special">;</span>

  <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"Testing update :"</span> <span class="special">);</span>
  <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"Update "</span> <span class="special">&lt;&lt;</span> <span class="identifier">field_name</span> <span class="special">&lt;&lt;</span> <span class="string">" with "</span> <span class="special">&lt;&lt;</span> <span class="identifier">value</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
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<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">example</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">message</span>
<span class="identifier">Running</span> <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
<span class="identifier">Testing</span> <span class="identifier">initialization</span> <span class="special">:</span>
<span class="identifier">Current</span> <span class="identifier">time</span><span class="special">:</span><span class="number">0</span>
<span class="identifier">Testing</span> <span class="identifier">update</span> <span class="special">:</span>
<span class="identifier">Update</span> <span class="identifier">Volume</span> <span class="identifier">with</span> <span class="number">100</span>

<span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span>
</pre>
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