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28 <h2><span class="refentrytitle">Struct template subtract_typeof_helper&lt;quantity&lt; unit&lt; Dim1, System1 &gt;, X &gt;, quantity&lt; unit&lt; Dim2, System2 &gt;, Y &gt;&gt;</span></h2>
29 <p>boost::units::subtract_typeof_helper&lt;quantity&lt; unit&lt; Dim1, System1 &gt;, X &gt;, quantity&lt; unit&lt; Dim2, System2 &gt;, Y &gt;&gt;</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.quantity_hpp" title="Header &lt;boost/units/quantity.hpp&gt;">boost/units/quantity.hpp</a>&gt;
33
34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Dim1<span class="special">,</span> <span class="keyword">typename</span> System1<span class="special">,</span> <span class="keyword">typename</span> Dim2<span class="special">,</span> <span class="keyword">typename</span> System2<span class="special">,</span> 
35          <span class="keyword">typename</span> X<span class="special">,</span> <span class="keyword">typename</span> Y<span class="special">&gt;</span> 
36 <span class="keyword">struct</span> <a class="link" href="subtract_typeof__id1806783.html" title="Struct template subtract_typeof_helper&lt;quantity&lt; unit&lt; Dim1, System1 &gt;, X &gt;, quantity&lt; unit&lt; Dim2, System2 &gt;, Y &gt;&gt;">subtract_typeof_helper</a><span class="special">&lt;</span><span class="identifier">quantity</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span> <span class="identifier">Dim1</span><span class="special">,</span> <span class="identifier">System1</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">X</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">quantity</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span> <span class="identifier">Dim2</span><span class="special">,</span> <span class="identifier">System2</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">&gt;</span><span class="special">&gt;</span> <span class="special">{</span>
37 <span class="special">}</span><span class="special">;</span></pre></div>
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