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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_message"></a><a class="link" href="assertion_boost_level_message.html" title="BOOST_&lt;level&gt;_MESSAGE"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span><span class="identifier">_MESSAGE</span></code></a>
</h4></div></div></div>
<pre class="programlisting"><span class="identifier">BOOST_WARN_MESSAGE</span><span class="special">(</span><span class="identifier">predicate</span><span class="special">,</span> <span class="identifier">message</span><span class="special">);</span>
<span class="identifier">BOOST_CHECK_MESSAGE</span><span class="special">(</span><span class="identifier">predicate</span><span class="special">,</span> <span class="identifier">message</span><span class="special">);</span>
<span class="identifier">BOOST_REQUIRE_MESSAGE</span><span class="special">(</span><span class="identifier">predicate</span><span class="special">,</span> <span class="identifier">message</span><span class="special">);</span>
</pre>
<p>
          These tools perform exactly the same check as <a class="link" href="assertion_boost_level.html" title="BOOST_&lt;level&gt;"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span></code></a>
          tools. The only difference is that instead of generating an error/confirm
          message these use the supplied one.
        </p>
<p>
          The first parameter is the boolean expression. The second parameter is
          the message reported in case of check failure. The message argument can
          be constructed of components of any type supporting the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&amp;)</span></code>.
        </p>
<h6>
<a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_message.h0"></a>
          <span class="phrase"><a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_message.example_descr"></a></span><a class="link" href="assertion_boost_level_message.html#boost_test.utf_reference.testing_tool_ref.assertion_boost_level_message.example_descr">Example:
          BOOST_&lt;level&gt;_MESSAGE 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="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">cmath</span><span class="special">&gt;</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="comment">// sin 45 radians is actually ~ 0.85, sin 45 degrees is ~0.707</span>
  <span class="keyword">double</span> <span class="identifier">res</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">sin</span><span class="special">(</span> <span class="number">45.</span> <span class="special">);</span>

  <span class="identifier">BOOST_WARN_MESSAGE</span><span class="special">(</span> <span class="identifier">res</span> <span class="special">&lt;</span> <span class="number">0.71</span><span class="special">,</span>
                      <span class="string">"sin(45){"</span> <span class="special">&lt;&lt;</span> <span class="identifier">res</span> <span class="special">&lt;&lt;</span> <span class="string">"} is &gt; 0.71. Arg is not in radian?"</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">warning</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">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">warning</span> <span class="identifier">in</span> <span class="string">"test"</span><span class="special">:</span> <span class="identifier">sin</span><span class="special">(</span><span class="number">45</span><span class="special">){</span><span class="number">0.850904</span><span class="special">}</span> <span class="identifier">is</span> <span class="special">&gt;</span> <span class="number">0.71</span><span class="special">.</span> <span class="identifier">Arg</span> <span class="identifier">is</span> <span class="keyword">not</span> <span class="identifier">in</span> <span class="identifier">radian</span><span class="special">?</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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<p>
          See also:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              <a class="link" href="assertion_boost_level.html" title="BOOST_&lt;level&gt;"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span></code></a>
            </li></ul></div>
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