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  28 <h2><span class="refentrytitle">Struct template is_dimensionless&lt;unit&lt; dimensionless_type, System &gt;&gt;</span></h2>
  29 <p>boost::units::is_dimensionless&lt;unit&lt; dimensionless_type, System &gt;&gt; &#8212; Check if a unit is dimensionless. </p>
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  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_units/Reference.html#header.boost.units.is_dimensionless_hpp" title="Header &lt;boost/units/is_dimensionless.hpp&gt;">boost/units/is_dimensionless.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> System<span class="special">&gt;</span>
  35 <span class="keyword">struct</span> <a class="link" href="is_dimensionl_idp344640832.html" title="Struct template is_dimensionless&lt;unit&lt; dimensionless_type, System &gt;&gt;">is_dimensionless</a><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span> <span class="identifier">dimensionless_type</span><span class="special">,</span> <span class="identifier">System</span> <span class="special">&gt;</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">true_</span> <span class="special">{</span>
  36 <span class="special">}</span><span class="special">;</span></pre></div>
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  40 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2008 Matthias Christian Schabel<br>Copyright &#169; 2007-2010 Steven
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