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  27 <a name="sort.single_thread.spreadsort.sort_hpp.rationale.unstable_sort"></a><a class="link" href="unstable_sort.html" title="Unstable Sorting">Unstable
  28             Sorting</a>
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  30 <p>
  31               Making a <a href="http://en.wikipedia.org/wiki/Radix_sort" target="_top">radix
  32               sort</a> stable requires the usage of an external copy of the data.
  33               A stable hybrid algorithm also requires a stable comparison-based algorithm,
  34               and these are generally slow. LSD <a href="http://en.wikipedia.org/wiki/Radix_sort" target="_top">radix
  35               sort</a> uses an external copy of the data, and provides stability,
  36               along with likely being faster (than a stable hybrid sort), so that's
  37               probably a better way to go for integer and floating-point types. It
  38               might make sense to make a stable version of <code class="literal"><code class="computeroutput"><a class="link" href="../../../../../boost/sort/spreadsort/string_s_idm46048202990736.html" title="Function template string_sort">string_sort</a></code></code>
  39               using external memory, but for simplicity this has been left out for
  40               now.
  41             </p>
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  46       Ross, Francisco Tapia, Orson Peters<p>
  47         Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost
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