span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">long</span> Base<span class="special">,</span> <span class="keyword">typename</span> Exponent<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="scale.html" title="Struct template scale">scale</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">Exponent</span> <a name="boost.units.scale.expon