s="special">&lt;,</span>
      <span class="special">&lt;=,</span> <span class="special">&gt;,</span>
      <span class="keyword">and</span> <span class="special">&gt;=</span></code>
      ) are provided to allow comparison of quantities from the same unit system.
      All operators simply delegate to the corresponding operator of the value type
      if the units permit.
    </p>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_units.Quantities.Heterogeneous_Operato