s="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  <span class="keyword">namespace</span> <span class="identifier">histogram</span> <span class="special">{</span>
    <span class="keyword">namespace</span> <span class="identifier">literals</span> <span class="special">{</span>

      <span class="comment">// Suffix operator to generate literal compile-time numbers, 0_c, 12_c, etc. </span>
      <span class="keyword">template</span><span