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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="property_tree.appendices"></a><a class="link" href="appendices.html" title="Appendices">Appendices</a>
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</h2></div></div></div>
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<h4>
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<a name="property_tree.appendices.h0"></a>
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<span class="phrase"><a name="property_tree.appendices.compatibility"></a></span><a class="link" href="appendices.html#property_tree.appendices.compatibility">Compatibility</a>
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</h4>
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<p>
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Property tree uses partial class template specialization. There has been no
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attempt to work around lack of support for this. The library will therefore
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most probably not work with Visual C++ 7.0 or earlier, or gcc 2.x.
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</p>
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<p>
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Property tree has been tested (regressions successfully compiled and run) with
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the following compilers:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Visual C++ 8.0
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</li>
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<li class="listitem">
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gcc 3.4.2 (MinGW)
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</li>
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<li class="listitem">
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gcc 3.3.5 (Linux)
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</li>
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<li class="listitem">
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gcc 3.4.4 (Linux)
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</li>
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<li class="listitem">
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gcc 4.3.3 (Linux)
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</li>
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<li class="listitem">
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Intel C++ 9.0 (Linux)
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</li>
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</ul></div>
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<h4>
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<a name="property_tree.appendices.h1"></a>
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<span class="phrase"><a name="property_tree.appendices.rationale"></a></span><a class="link" href="appendices.html#property_tree.appendices.rationale">Rationale</a>
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</h4>
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<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<span class="bold"><strong>Why are there 3 versions of <code class="computeroutput"><a class="link" href="../boost/property_tree/basic_ptree.html#id-1_3_33_10_7_1_1_1_3_63-bb">get</a></code>?
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Couldn't there be just one?</strong></span> The three versions reflect experience
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gathered during several of years of using property tree in several different
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applications. During that time I tried hard to come up with one, proper
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form of the get function, and failed. I know of these three basic patterns
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of usage:
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="emphasis"><em>Just get the data and I do not care if it cannot be done.</em></span>
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This is used when the programmer is fairly sure that data exists.
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Or in homework assignments. Or when tomorrow is final deadline for
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your project.
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</li>
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<li class="listitem">
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<span class="emphasis"><em>Get the data and revert to default value if it cannot be
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done.</em></span> Used when you want to allow omitting the key in
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question. Implemented by some similar tools (windows INI file access
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functions).
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</li>
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<li class="listitem">
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<span class="emphasis"><em>Get the data, but I care more whether you succeeded than
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I do for the data itself.</em></span> Used when you want to vary control
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flow depending on get success/failure. Or to check for presence of
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a key.
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</li>
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</ul></div>
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</li></ol></div>
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<h4>
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<a name="property_tree.appendices.h2"></a>
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<span class="phrase"><a name="property_tree.appendices.future_development"></a></span><a class="link" href="appendices.html#property_tree.appendices.future_development">Future
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Development</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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More parsers: YAML, environment strings.
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</li>
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<li class="listitem">
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More robust XML parser.
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</li>
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<li class="listitem">
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Mathematical relations: ptree difference, union, intersection. Useful for
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finding configuration file changes etc.
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</li>
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</ul></div>
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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 © 2008-2010 Marcin Kalicinski<br>Copyright © 2010-2013 Sebastian
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Redl<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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