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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_small"></a><a class="link" href="assertion_boost_level_small.html" title="BOOST_&lt;level&gt;_SMALL"><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">_SMALL</span></code></a>
</h4></div></div></div>
<pre class="programlisting"><span class="identifier">BOOST_WARN_SMALL</span><span class="special">(</span><span class="identifier">value</span><span class="special">,</span> <span class="identifier">tolerance</span><span class="special">);</span>
<span class="identifier">BOOST_CHECK_SMALL</span><span class="special">(</span><span class="identifier">value</span><span class="special">,</span> <span class="identifier">tolerance</span><span class="special">);</span>
<span class="identifier">BOOST_REQUIRE_SMALL</span><span class="special">(</span><span class="identifier">value</span><span class="special">,</span> <span class="identifier">tolerance</span><span class="special">);</span>
</pre>
<p>
          These tools are used to check that supplied value is small enough. The
          "smallness" is defined by absolute value of the tolerance supplied
          as a second argument. Use these tools with caution. To compare to values
          on closeness it's preferable to use <a class="link" href="assertion_boost_level_close.html" title="BOOST_&lt;level&gt;_CLOSE"><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">_CLOSE</span></code></a> tools instead.
        </p>
<p>
          The first parameter is the value to check. The second parameter is the
          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>
            The floating point comparison tools are automatically added if the <span class="emphasis"><em>Unit
            Test Framework</em></span> is included as indicated in the previous sections.
            The tools are implemented is in the header <code class="computeroutput"><a class="link" href="../../../header/boost/test/tools/floating_point_comparison_hpp.html" title="Header &lt;boost/test/tools/floating_point_comparison.hpp&gt;">boost/test/tools/floating_point_comparison.hpp</a></code>.
          </p></td></tr>
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<h6>
<a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_small.h0"></a>
          <span class="phrase"><a name="boost_test.utf_reference.testing_tool_ref.assertion_boost_level_small.example_descr"></a></span><a class="link" href="assertion_boost_level_small.html#boost_test.utf_reference.testing_tool_ref.assertion_boost_level_small.example_descr">Example:
          BOOST_&lt;level&gt;_SMALL usage</a>
        </h6>
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                  <p>
                    Code
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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">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">tools</span><span class="special">/</span><span class="identifier">floating_point_comparison</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</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">double</span> <span class="identifier">v</span> <span class="special">=</span> <span class="special">-</span><span class="number">1.23456e-3</span><span class="special">;</span>
  <span class="identifier">BOOST_CHECK_SMALL</span><span class="special">(</span> <span class="identifier">v</span><span class="special">,</span> <span class="number">0.000001</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
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                  <p>
                    Output
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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="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">11</span><span class="special">):</span> <span class="identifier">error</span> <span class="identifier">in</span> <span class="string">"test"</span><span class="special">:</span> <span class="identifier">absolute</span> <span class="identifier">value</span> <span class="identifier">of</span> <span class="identifier">v</span><span class="special">{-</span><span class="number">0.00123456</span><span class="special">}</span> <span class="identifier">exceeds</span> <span class="number">1e-006</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>
<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_close.html" title="BOOST_&lt;level&gt;_CLOSE"><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">_CLOSE</span></code></a>
            </li>
<li class="listitem">
              <a class="link" href="assertion_boost_level_close_fraction.html" title="BOOST_&lt;level&gt;_CLOSE_FRACTION"><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">_CLOSE_FRACTION</span></code></a>
            </li>
<li class="listitem">
              <a class="link" href="../../testing_tools/extended_comparison/floating_point/floating_points_comparison_theory.html" title="Theory behind floating point comparisons">Floating
              point comparison algorithms</a>
            </li>
</ul></div>
</div>
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