boost_1_45_0/doc/html/foreach/history_and_acknowledgements.html - nest-learning-thermostat/5.0/boost - Git at Google

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 </h2></div></div></div>
 <a name="foreach.history_and_acknowledgements.history"></a><h3>
 <a name="id1263309"></a>
       <a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.history">History</a>
     </h3>
 <p>
       The ideas for <code class="literal">BOOST_FOREACH</code> began life in the Visual C++
       group at Microsoft during the early phases of the design for C++/CLI. Whether
       to add a dedicated "foreach" looping construct to the language was
       an open question at the time. As a mental exercise, Anson Tsao sent around
       some proof-of-concept code which demonstrated that a pure library solution
       might be possible. The code was written in the proposed C++/CLI dialect of
       the time, for which there was no compiler as of yet. I was intrigued by the
       possibility, and I ported his code to Managed C++ and got it working. We worked
       together to refine the idea and eventually published an article about it in
       the November 2003 issue of the <a href="http://www.cuj.com" target="_top">CUJ</a>.
     </p>
 <p>
       After leaving Microsoft, I revisited the idea of a looping construct. I reimplemented
       the macro from scratch in standard C++, corrected some shortcomings of the
       CUJ version and rechristened it <code class="literal">BOOST_FOREACH</code>. In October
       of 2003 I began a discussion about it on the Boost developers list, where it
       met with a luke-warm reception. I dropped the issue until December 2004, when
       I reimplemented <code class="literal">BOOST_FOREACH</code> yet again. The new version
       only evaluated its sequence expression once and correctly handled both lvalue
       and rvalue sequence expressions. It was built on top of the recently accepted
       <a href="../../../libs/range/index.html" target="_top">Boost.Range</a> library, which
       increased its portability. This was the version that, on Dec. 12 2004, I finally
       submitted to Boost for review. It was accepted into Boost on May 5, 2005.
     </p>
 <a name="foreach.history_and_acknowledgements.acknowledgements"></a><h3>
 <a name="id1263379"></a>
       <a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.acknowledgements">Acknowledgements</a>
     </h3>
 <p>
       Thanks go out to Anson Tsao of Microsoft for coming up with the idea and demonstrating
       its feasibility. I would also like to thank <a href="http://boost.org/people/thorsten_ottosen.html" target="_top">Thorsten
       Ottosen</a> for the <a href="../../../libs/range/index.html" target="_top">Boost.Range</a>
       library, on which the current version of <code class="literal">BOOST_FOREACH</code> is
       built. Finally, I'd like to thank Russell Hind, Alisdair Meredith and Stefan
       Slapeta for their help porting to various compilers.
     </p>
 <a name="foreach.history_and_acknowledgements.further_reading"></a><h3>
 <a name="id1263429"></a>
       <a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.further_reading">Further
       Reading</a>
     </h3>
 <p>
       For more information about how <code class="literal">BOOST_FOREACH</code> works, you
       may refer to the article <a href="http://www.artima.com/cppsource/foreach.html" target="_top"><span class="quote">&#8220;<span class="quote">Conditional
       Love</span>&#8221;</span></a> at <a href="http://www.artima.com/cppsource/" target="_top">The C++
       Source</a>.
     </p>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
 <td align="right"><div class="copyright-footer">Copyright &#169; 2004 Eric Niebler<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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	</h2></div></div></div>
	<a name="foreach.history_and_acknowledgements.history"></a><h3>
	<a name="id1263309"></a>
	<a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.history">History</a>
	</h3>
	<p>
	The ideas for <code class="literal">BOOST_FOREACH</code> began life in the Visual C++
	group at Microsoft during the early phases of the design for C++/CLI. Whether
	to add a dedicated "foreach" looping construct to the language was
	an open question at the time. As a mental exercise, Anson Tsao sent around
	some proof-of-concept code which demonstrated that a pure library solution
	might be possible. The code was written in the proposed C++/CLI dialect of
	the time, for which there was no compiler as of yet. I was intrigued by the
	possibility, and I ported his code to Managed C++ and got it working. We worked
	together to refine the idea and eventually published an article about it in
	the November 2003 issue of the <a href="http://www.cuj.com" target="_top">CUJ</a>.
	</p>
	<p>
	After leaving Microsoft, I revisited the idea of a looping construct. I reimplemented
	the macro from scratch in standard C++, corrected some shortcomings of the
	CUJ version and rechristened it <code class="literal">BOOST_FOREACH</code>. In October
	of 2003 I began a discussion about it on the Boost developers list, where it
	met with a luke-warm reception. I dropped the issue until December 2004, when
	I reimplemented <code class="literal">BOOST_FOREACH</code> yet again. The new version
	only evaluated its sequence expression once and correctly handled both lvalue
	and rvalue sequence expressions. It was built on top of the recently accepted
	<a href="../../../libs/range/index.html" target="_top">Boost.Range</a> library, which
	increased its portability. This was the version that, on Dec. 12 2004, I finally
	submitted to Boost for review. It was accepted into Boost on May 5, 2005.
	</p>
	<a name="foreach.history_and_acknowledgements.acknowledgements"></a><h3>
	<a name="id1263379"></a>
	<a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.acknowledgements">Acknowledgements</a>
	</h3>
	<p>
	Thanks go out to Anson Tsao of Microsoft for coming up with the idea and demonstrating
	its feasibility. I would also like to thank <a href="http://boost.org/people/thorsten_ottosen.html" target="_top">Thorsten
	Ottosen</a> for the <a href="../../../libs/range/index.html" target="_top">Boost.Range</a>
	library, on which the current version of <code class="literal">BOOST_FOREACH</code> is
	built. Finally, I'd like to thank Russell Hind, Alisdair Meredith and Stefan
	Slapeta for their help porting to various compilers.
	</p>
	<a name="foreach.history_and_acknowledgements.further_reading"></a><h3>
	<a name="id1263429"></a>
	<a class="link" href="history_and_acknowledgements.html#foreach.history_and_acknowledgements.further_reading">Further
	Reading</a>
	</h3>
	<p>
	For more information about how <code class="literal">BOOST_FOREACH</code> works, you
	may refer to the article <a href="http://www.artima.com/cppsource/foreach.html" target="_top"><span class="quote">“<span class="quote">Conditional
	Love</span>”</span></a> at <a href="http://www.artima.com/cppsource/" target="_top">The C++
	Source</a>.
	</p>
	</div>
	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
	<td align="left"></td>
	<td align="right"><div class="copyright-footer">Copyright © 2004 Eric Niebler<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>
	</div></td>
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