79 lines
4.9 KiB
HTML
79 lines
4.9 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Background</title>
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<link rel="stylesheet" href="boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="Safe Numerics">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr>
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<td valign="top"><img href="index.html" height="164px" src="pre-boost.jpg" alt="Library Documentation Index"></td>
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<td><h2>Safe Numerics</h2></td>
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</tr></table>
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<a accesskey="p" href="safety_critical_embedded_controller.html"><img src="images/prev.png" alt="Prev"></a><a accesskey="u" href="index.html"><img src="images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a><a accesskey="n" href="concepts.html"><img src="images/next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="safe_numerics.notes"></a>Background</h2></div></div></div>
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<p>This library started out as a re-implementation of the facilities
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provided by <a href="http://safeint.codeplex.com" target="_top">David LeBlanc's SafeInt
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Library</a>. I found this library to be well done in every way. My main
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usage was to run unit tests for my embedded systems projects on my PC.
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Still, from my perspective it had a few issues.</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem"><p>It was a lot of code in one header - 6400 lines. Very unwieldy to
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understand, modify and maintain.</p></li>
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<li class="listitem"><p>I couldn't find separate documentation other than that in the
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header file.</p></li>
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<li class="listitem"><p>It didn't use <a href="http://www.boost.org" target="_top">Boost</a>
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conventions for naming.</p></li>
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<li class="listitem"><p>It required porting to different compilers.</p></li>
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<li class="listitem"><p>It had a very long license associated with it.</p></li>
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<li class="listitem"><p>I could find no test suite for the library.</p></li>
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</ul></div>
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<p>Using later versions of C++ and the its standard library, template
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metaprogramming and <a href="http://www.boost.org" target="_top">Boost
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libraries</a> I managed to (re)implement similar functionality in under
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2000 ? lines of code. I promoted this version as a possible submission to
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the Boost. The feedback I received convinced me that no such library would
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be considered acceptable to the large majority of C++ programmers. It seems
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that the desire for maximum performance overrides any requirement that a
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program be known to be free of bugs. By this time I had a better idea of the
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opportunities available with the latest version of C++ (C++14) and resolved
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to address this issue by creating a library which would provide all the
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facilities of safe numerics at minimal runtime cost. The result is what you
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see here. The library now consists of 7000 lines of code, approximately 50
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separate tests and more than 60 pages of documentation and examples.</p>
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<p>Since I wrote the above, I've been contacted by David LeBlanc. He's
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been updating his package and informs me that the latest
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version:</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem"><p>SafeInt does not require porting for different compilers, is
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fully supported on gcc, clang, and Visual Studio.</p></li>
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<li class="listitem"><p>The license has been changed from MS-PL to MIT license.</p></li>
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<li class="listitem"><p>The library has had a test suite since before it was public, and
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is now located here:</p></li>
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<li class="listitem"><p>SafeInt also has no external dependencies other than standard
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library files, and doesn't need anything else installed to
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work.</p></li>
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</ul></div>
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<p>His current package can now be found at in <a href="https://github.com/dcleblanc/SafeInt" target="_top">github</a>.</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2012-2018 Robert Ramey<p><a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">Subject to Boost
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Software License</a></p>
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</div></td>
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</tr></table>
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