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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="property_tree.appendices"></a><a class="link" href="appendices.html" title="Appendices">Appendices</a> |
| </h2></div></div></div> |
| <a name="property_tree.appendices.compatibility"></a><h4> |
| <a name="id2113180"></a> |
| <a class="link" href="appendices.html#property_tree.appendices.compatibility">Compatibility</a> |
| </h4> |
| <p> |
| Property tree uses partial class template specialization. There has been no |
| attempt to work around lack of support for this. The library will therefore |
| most probably not work with Visual C++ 7.0 or earlier, or gcc 2.x. |
| </p> |
| <p> |
| Property tree has been tested (regressions successfully compiled and run) with |
| the following compilers: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Visual C++ 8.0 |
| </li> |
| <li class="listitem"> |
| gcc 3.4.2 (MinGW) |
| </li> |
| <li class="listitem"> |
| gcc 3.3.5 (Linux) |
| </li> |
| <li class="listitem"> |
| gcc 3.4.4 (Linux) |
| </li> |
| <li class="listitem"> |
| gcc 4.3.3 (Linux) |
| </li> |
| <li class="listitem"> |
| Intel C++ 9.0 (Linux) |
| </li> |
| </ul></div> |
| <a name="property_tree.appendices.rationale"></a><h4> |
| <a name="id2113260"></a> |
| <a class="link" href="appendices.html#property_tree.appendices.rationale">Rationale</a> |
| </h4> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <p class="simpara"> |
| <span class="bold"><strong>Why are there 3 versions of <code class="computeroutput"><a class="link" href="../boost/property_tree/basic_ptree.html#id900429-bb">get</a></code>? |
| Couldn't there be just one?</strong></span> The three versions reflect experience |
| gathered during several of years of using property tree in several different |
| applications. During that time I tried hard to come up with one, proper |
| form of the get function, and failed. I know of these three basic patterns |
| of usage: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <span class="emphasis"><em>Just get the data and I do not care if it cannot be done.</em></span> |
| This is used when the programmer is fairly sure that data exists. Or |
| in homework assignments. Or when tomorrow is final deadline for your |
| project. |
| </li> |
| <li class="listitem"> |
| <span class="emphasis"><em>Get the data and revert to default value if it cannot be |
| done.</em></span> Used when you want to allow omitting the key in question. |
| Implemented by some similar tools (windows INI file access functions). |
| </li> |
| <li class="listitem"> |
| <span class="emphasis"><em>Get the data, but I care more whether you succeeded than |
| I do for the data itself.</em></span> Used when you want to vary control |
| flow depending on get success/failure. Or to check for presence of |
| a key. |
| </li> |
| </ul></div> |
| </li></ol></div> |
| <a name="property_tree.appendices.future_development"></a><h4> |
| <a name="id2113361"></a> |
| <a class="link" href="appendices.html#property_tree.appendices.future_development">Future Development</a> |
| </h4> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| More parsers: YAML, environment strings. |
| </li> |
| <li class="listitem"> |
| More robust XML parser. |
| </li> |
| <li class="listitem"> |
| Mathematical relations: ptree difference, union, intersection. Useful for |
| finding configuration file changes etc. |
| </li> |
| </ul></div> |
| </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 © 2008 Marcin Kalicinski<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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