special">,</span> <span class="keyword">typename</span> Y<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="plain_1_3_44_10_2_30_3_1_9.html" title="Struct template plain_return_type_2&lt;arithmetic_action&lt; multiply_action &gt;, boost::units::unit&lt; Dim1, System1 &gt;, boost::units::quantity&lt; Unit2, Y &gt;&gt;">plain_return_type_2</a><span class="special">&lt;</span><span class="identifier">arithmetic_action</span><span class="special">&lt;</span> <span class