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<title>Appendix F: Other Implementations</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_pool.appendices.implementations"></a><a class="link" href="implementations.html" title="Appendix F: Other Implementations">Appendix F: Other
      Implementations</a>
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<p>
        Pool allocators are found in many programming languages, and in many variations.
        The beginnings of many implementations may be found in common programming
        literature; some of these are given below. Note that none of these are complete
        implementations of a Pool; most of these leave some aspects of a Pool as
        a user exercise. However, in each case, even though some aspects are missing,
        these examples use the same underlying concept of a Simple Segregated Storage
        described in this document.
      </p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
            <span class="emphasis"><em>The C++ Programming Language</em></span>, 3rd ed., by Bjarne
            Stroustrup, Section 19.4.2. Missing aspects:
            <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                  Not portable.
                </li>
<li class="listitem">
                  Cannot handle allocations of arbitrary numbers of objects (this
                  was left as an exercise).
                </li>
<li class="listitem">
                  Not thread-safe.
                </li>
<li class="listitem">
                  Suffers from the static initialization problem.
                </li>
</ul></div>
          </li>
<li class="listitem">
            <span class="emphasis"><em>MicroC/OS-II: The Real-Time Kernel</em></span>, by Jean J. Labrosse,
            Chapter 7 and Appendix B.04.
            <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                  An example of the Simple Segregated Storage scheme at work in the
                  internals of an actual OS.
                </li>
<li class="listitem">
                  Missing aspects:
                </li>
<li class="listitem">
                  Not portable (though this is OK, since it's part of its own OS).
                </li>
<li class="listitem">
                  Cannot handle allocations of arbitrary numbers of blocks (which
                  is also OK, since this feature is not needed).
                </li>
<li class="listitem">
                  Requires non-intuitive user code to create and destroy the Pool.
                </li>
</ul></div>
          </li>
<li class="listitem">
            <span class="emphasis"><em>Efficient C++: Performance Programming Techniques</em></span>,
            by Dov Bulka and David Mayhew, Chapters 6 and 7.
            <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                  This is a good example of iteratively developing a Pool solutio.
                </li>
<li class="listitem">
                  however, their premise (that the system-supplied allocation mechanism
                  is hopelessly inefficient) is flawed on every system I've tested
                  on.
                </li>
<li class="listitem">
                  Run their timings on your system before you accept their conclusions.
                </li>
<li class="listitem">
                  Missing aspect: Requires non-intuitive user code to create and
                  destroy the Pool.
                </li>
</ul></div>
          </li>
<li class="listitem">
            <span class="emphasis"><em>Advanced C++: Programming Styles and Idioms</em></span>, by
            James O. Coplien, Section 3.6.
            <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                  Has examples of both static and dynamic pooling, but missing aspects:
                </li>
<li class="listitem">
                  Not thread-safe.
                </li>
<li class="listitem">
                  The static pooling example is not portable.
                </li>
</ul></div>
          </li>
</ol></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000-2006 Stephen Cleary<br>Copyright &#169; 2011 Paul A. Bristow<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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