1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Appendices</title> 6<link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../property_tree.html" title="Chapter 31. Boost.PropertyTree"> 10<link rel="prev" href="accessing.html" title="How to Access Data in a Property Tree"> 11<link rel="next" href="reference.html" title="Reference"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> 16<td align="center"><a href="../../../index.html">Home</a></td> 17<td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="accessing.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../property_tree.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="section"> 27<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 28<a name="property_tree.appendices"></a><a class="link" href="appendices.html" title="Appendices">Appendices</a> 29</h2></div></div></div> 30<h4> 31<a name="property_tree.appendices.h0"></a> 32 <span class="phrase"><a name="property_tree.appendices.compatibility"></a></span><a class="link" href="appendices.html#property_tree.appendices.compatibility">Compatibility</a> 33 </h4> 34<p> 35 Property tree uses partial class template specialization. There has been no 36 attempt to work around lack of support for this. The library will therefore 37 most probably not work with Visual C++ 7.0 or earlier, or gcc 2.x. 38 </p> 39<p> 40 Property tree has been tested (regressions successfully compiled and run) with 41 the following compilers: 42 </p> 43<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 44<li class="listitem"> 45 Visual C++ 8.0 46 </li> 47<li class="listitem"> 48 gcc 3.4.2 (MinGW) 49 </li> 50<li class="listitem"> 51 gcc 3.3.5 (Linux) 52 </li> 53<li class="listitem"> 54 gcc 3.4.4 (Linux) 55 </li> 56<li class="listitem"> 57 gcc 4.3.3 (Linux) 58 </li> 59<li class="listitem"> 60 Intel C++ 9.0 (Linux) 61 </li> 62</ul></div> 63<h4> 64<a name="property_tree.appendices.h1"></a> 65 <span class="phrase"><a name="property_tree.appendices.rationale"></a></span><a class="link" href="appendices.html#property_tree.appendices.rationale">Rationale</a> 66 </h4> 67<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 68 <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_32_10_7_1_1_1_3_63-bb">get</a></code>? 69 Couldn't there be just one?</strong></span> The three versions reflect experience 70 gathered during several of years of using property tree in several different 71 applications. During that time I tried hard to come up with one, proper 72 form of the get function, and failed. I know of these three basic patterns 73 of usage: 74 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 75<li class="listitem"> 76 <span class="emphasis"><em>Just get the data and I do not care if it cannot be done.</em></span> 77 This is used when the programmer is fairly sure that data exists. 78 Or in homework assignments. Or when tomorrow is final deadline for 79 your project. 80 </li> 81<li class="listitem"> 82 <span class="emphasis"><em>Get the data and revert to default value if it cannot be 83 done.</em></span> Used when you want to allow omitting the key in 84 question. Implemented by some similar tools (windows INI file access 85 functions). 86 </li> 87<li class="listitem"> 88 <span class="emphasis"><em>Get the data, but I care more whether you succeeded than 89 I do for the data itself.</em></span> Used when you want to vary control 90 flow depending on get success/failure. Or to check for presence of 91 a key. 92 </li> 93</ul></div> 94 </li></ol></div> 95<h4> 96<a name="property_tree.appendices.h2"></a> 97 <span class="phrase"><a name="property_tree.appendices.future_development"></a></span><a class="link" href="appendices.html#property_tree.appendices.future_development">Future 98 Development</a> 99 </h4> 100<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 101<li class="listitem"> 102 More parsers: YAML, environment strings. 103 </li> 104<li class="listitem"> 105 More robust XML parser. 106 </li> 107<li class="listitem"> 108 Mathematical relations: ptree difference, union, intersection. Useful for 109 finding configuration file changes etc. 110 </li> 111</ul></div> 112</div> 113<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 114<td align="left"></td> 115<td align="right"><div class="copyright-footer">Copyright © 2008-2010 Marcin Kalicinski<br>Copyright © 2010-2013 Sebastian 116 Redl<p> 117 Distributed under the Boost Software License, Version 1.0. (See accompanying 118 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>) 119 </p> 120</div></td> 121</tr></table> 122<hr> 123<div class="spirit-nav"> 124<a accesskey="p" href="accessing.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../property_tree.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> 125</div> 126</body> 127</html> 128
