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7<title>Boost.Python TODO list Boost</title>
8<link rel="stylesheet" href="../../rst.css" type="text/css" />
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10<body>
11<div class="document" id="boost-python-todo-list-logo">
12<h1 class="title"><a class="reference" href="index.html">Boost.Python</a> TODO list <a class="reference" href="../../index.htm"><img alt="Boost" src="../../boost.png" /></a></h1>
13<!-- -*- mode: rst -*- -->
14<table class="field-list" frame="void" rules="none">
15<col class="field-name" />
16<col class="field-body" />
17<tbody valign="top">
18<tr class="field"><th class="field-name">copyright:</th><td class="field-body">Copyright David Abrahams 2003. Use, modification, and
19distribution are subject to the Boost Software License, Version
201.0. (See accompanying file <a class="reference" href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at
21<a class="reference" href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</td>
22</tr>
23</tbody>
24</table>
25<div class="contents topic" id="outline">
26<p class="topic-title"><a name="outline">Outline</a></p>
27<ul class="simple">
28<li><a class="reference" href="#class-support" id="id4" name="id4">Class Support</a><ul>
29<li><a class="reference" href="#base-class-for-virtual-function-callback-wrappers" id="id5" name="id5">Base Class for Virtual Function Callback Wrappers</a></li>
30</ul>
31</li>
32<li><a class="reference" href="#miscellaneous" id="id6" name="id6">Miscellaneous</a><ul>
33<li><a class="reference" href="#support-for-enums-with-duplicate-values" id="id7" name="id7">Support for Enums with Duplicate Values</a></li>
34</ul>
35</li>
36<li><a class="reference" href="#functions" id="id8" name="id8">Functions</a><ul>
37<li><a class="reference" href="#wrapping-function-objects" id="id9" name="id9">Wrapping Function Objects</a></li>
38<li><a class="reference" href="#best-match-overload-resolution" id="id10" name="id10">&quot;Best Match&quot; Overload Resolution</a></li>
39</ul>
40</li>
41<li><a class="reference" href="#type-converters" id="id11" name="id11">Type Converters</a><ul>
42<li><a class="reference" href="#lvalue-conversions-from-non-const-pytypeobject-s" id="id12" name="id12">Lvalue conversions from non-const <tt class="literal"><span class="pre">PyTypeObject*</span></tt>s</a></li>
43<li><a class="reference" href="#converter-scoping" id="id13" name="id13">Converter Scoping</a></li>
44<li><a class="reference" href="#file-conversions" id="id14" name="id14"><tt class="literal"><span class="pre">FILE*</span></tt> conversions</a></li>
45<li><a class="reference" href="#void-conversions" id="id15" name="id15"><tt class="literal"><span class="pre">void*</span></tt> conversions</a></li>
46<li><a class="reference" href="#post-call-actions" id="id16" name="id16">Post-Call Actions</a></li>
47<li><a class="reference" href="#pyunicode-support" id="id17" name="id17"><tt class="literal"><span class="pre">PyUnicode</span></tt> Support</a></li>
48<li><a class="reference" href="#ownership-metadata" id="id18" name="id18">Ownership Metadata</a></li>
49</ul>
50</li>
51<li><a class="reference" href="#documentation" id="id19" name="id19">Documentation</a><ul>
52<li><a class="reference" href="#builtin-converters" id="id20" name="id20">Builtin Converters</a></li>
53<li><a class="reference" href="#internals" id="id21" name="id21">Internals</a></li>
54</ul>
55</li>
56<li><a class="reference" href="#large-scale" id="id22" name="id22">Large Scale</a><ul>
57<li><a class="reference" href="#full-threading-support" id="id23" name="id23">Full Threading Support</a></li>
58<li><a class="reference" href="#langbinding" id="id24" name="id24">Langbinding</a></li>
59<li><a class="reference" href="#refactoring-and-reorganization" id="id25" name="id25">Refactoring and Reorganization</a></li>
60<li><a class="reference" href="#numarray-support-enhancements" id="id26" name="id26">NumArray Support Enhancements</a></li>
61<li><a class="reference" href="#pyfinalize-safety" id="id27" name="id27"><tt class="literal"><span class="pre">PyFinalize</span></tt> Safety</a></li>
62</ul>
63</li>
64</ul>
65</div>
66<div class="section" id="class-support">
67<h1><a class="toc-backref" href="#id4" name="class-support">Class Support</a></h1>
68<div class="section" id="base-class-for-virtual-function-callback-wrappers">
69<h2><a class="toc-backref" href="#id5" name="base-class-for-virtual-function-callback-wrappers">Base Class for Virtual Function Callback Wrappers</a></h2>
70<ul class="simple">
71<li><a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1456023">http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1456023</a>
72(bottom of message)</li>
73<li><a class="reference" href="http://mail.python.org/pipermail/c++-sig/2003-August/005297.html">http://mail.python.org/pipermail/c++-sig/2003-August/005297.html</a>
74(search for <tt class="literal"><span class="pre">VirtualDispatcher</span></tt>) describes how callback classes
75can swap ownership relationship with their Python wrappers.</li>
76<li><a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1860301">http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1860301</a>
77describes how this can also be used to considerably simplify
78callback classes, solve some &quot;dangling reference&quot; problems, and
79optimize the calling of non-overridden virtual functions.</li>
80</ul>
81</div>
82</div>
83<div class="section" id="miscellaneous">
84<h1><a class="toc-backref" href="#id6" name="miscellaneous">Miscellaneous</a></h1>
85<div class="section" id="support-for-enums-with-duplicate-values">
86<h2><a class="toc-backref" href="#id7" name="support-for-enums-with-duplicate-values">Support for Enums with Duplicate Values</a></h2>
87<blockquote>
88Scott Snyder provided a patch; Dave was dissatisfied for some
89reason, but maybe it should just be applied if no further action
90occurs <a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/1824616">http://aspn.activestate.com/ASPN/Mail/Message/1824616</a>.</blockquote>
91</div>
92</div>
93<div class="section" id="functions">
94<h1><a class="toc-backref" href="#id8" name="functions">Functions</a></h1>
95<div class="section" id="wrapping-function-objects">
96<h2><a class="toc-backref" href="#id9" name="wrapping-function-objects">Wrapping Function Objects</a></h2>
97<blockquote>
98<p>It should be possible to wrap classes which support <tt class="literal"><span class="pre">operator()</span></tt>
99as Python methods.</p>
100<p><a class="reference" href="http://mail.python.org/pipermail/c++-sig/2003-August/005184.html">http://mail.python.org/pipermail/c++-sig/2003-August/005184.html</a></p>
101</blockquote>
102</div>
103<div class="section" id="best-match-overload-resolution">
104<h2><a class="toc-backref" href="#id10" name="best-match-overload-resolution">&quot;Best Match&quot; Overload Resolution</a></h2>
105<blockquote>
106<p>Overload resolution currently depends on the order in which <tt class="literal"><span class="pre">def</span></tt>
107calls are made (preferring later overloads).  This should be
108changed so that the best-matching overload is always selected.
109This may await <a class="reference" href="#langbinding">Langbinding</a> integration, since the technology is
110already in <a class="reference" href="http://luabind.sf.net">Luabind</a>.</p>
111</blockquote>
112</div>
113</div>
114<div class="section" id="type-converters">
115<h1><a class="toc-backref" href="#id11" name="type-converters">Type Converters</a></h1>
116<div class="section" id="lvalue-conversions-from-non-const-pytypeobject-s">
117<h2><a class="toc-backref" href="#id12" name="lvalue-conversions-from-non-const-pytypeobject-s">Lvalue conversions from non-const <tt class="literal"><span class="pre">PyTypeObject*</span></tt>s</a></h2>
118<blockquote>
119<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1662717">http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1662717</a></blockquote>
120</div>
121<div class="section" id="converter-scoping">
122<h2><a class="toc-backref" href="#id13" name="converter-scoping">Converter Scoping</a></h2>
123<blockquote>
124<p><a class="reference" href="http://article.gmane.org/gmane.comp.python.c++/2044">http://article.gmane.org/gmane.comp.python.c++/2044</a></p>
125<p>If this gets done at all, it is going to happen in conjunction
126with <a class="reference" href="#langbinding">Luabind integration</a>.</p>
127</blockquote>
128</div>
129<div class="section" id="file-conversions">
130<h2><a class="toc-backref" href="#id14" name="file-conversions"><tt class="literal"><span class="pre">FILE*</span></tt> conversions</a></h2>
131<blockquote>
132<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/1411366">http://aspn.activestate.com/ASPN/Mail/Message/1411366</a></blockquote>
133</div>
134<div class="section" id="void-conversions">
135<h2><a class="toc-backref" href="#id15" name="void-conversions"><tt class="literal"><span class="pre">void*</span></tt> conversions</a></h2>
136<blockquote>
137Pointers to <em>cv</em> <tt class="literal"><span class="pre">void</span></tt> should be able to be passed and
138returned as opaque values.</blockquote>
139</div>
140<div class="section" id="post-call-actions">
141<h2><a class="toc-backref" href="#id16" name="post-call-actions">Post-Call Actions</a></h2>
142<blockquote>
143From-Python converters should be passed an extra reference to a
144chain of post-call actions in the Policies object, where they can
145register an additional action.  See the end of
146<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1755435">http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1755435</a></blockquote>
147</div>
148<div class="section" id="pyunicode-support">
149<h2><a class="toc-backref" href="#id17" name="pyunicode-support"><tt class="literal"><span class="pre">PyUnicode</span></tt> Support</a></h2>
150<blockquote>
151<p>Review and possibly incorporate changes from <a class="reference" href="mailto:qinlj-at-solidshare.com">Lijun Qin</a> at
152<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1771145">http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1771145</a></p>
153</blockquote>
154</div>
155<div class="section" id="ownership-metadata">
156<h2><a class="toc-backref" href="#id18" name="ownership-metadata">Ownership Metadata</a></h2>
157<blockquote>
158In the thread at
159<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1860301">http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1860301</a>,
160Niall Douglas describes an idea for solving some &quot;false&quot;
161dangling pointer/reference return errors by attaching data about
162objects which lets the framework determine that the reference
163count on an object doesn't tell us anything about the lifetime
164of its data.</blockquote>
165</div>
166</div>
167<div class="section" id="documentation">
168<h1><a class="toc-backref" href="#id19" name="documentation">Documentation</a></h1>
169<div class="section" id="builtin-converters">
170<h2><a class="toc-backref" href="#id20" name="builtin-converters">Builtin Converters</a></h2>
171<blockquote>
172Builtin correspondences between builtiin Python types and C++
173types need to be documented</blockquote>
174</div>
175<div class="section" id="internals">
176<h2><a class="toc-backref" href="#id21" name="internals">Internals</a></h2>
177<blockquote>
178<p>The structure of the framework needs to get documented; <a class="reference" href="mailto:brett.calcott-at-paradise.net.nz">Brett
179Calcott</a> has promised to turn <a class="reference" href="doc/internals.html">this document</a> into something fit
180for users</p>
181</blockquote>
182</div>
183</div>
184<div class="section" id="large-scale">
185<h1><a class="toc-backref" href="#id22" name="large-scale">Large Scale</a></h1>
186<div class="section" id="full-threading-support">
187<h2><a class="toc-backref" href="#id23" name="full-threading-support">Full Threading Support</a></h2>
188<blockquote>
189Various people have proposed patches to improve threading support
190in Boost.Python: see the thread at
191<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/1826544">http://aspn.activestate.com/ASPN/Mail/Message/1826544</a> and
192<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/1865842">http://aspn.activestate.com/ASPN/Mail/Message/1865842</a> for some
193examples.  The only problem is that these are incomplete
194solutions and verifying that we <em>do</em> have a complete solution is
195going to take some time and attention.</blockquote>
196</div>
197<div class="section" id="langbinding">
198<h2><a class="toc-backref" href="#id24" name="langbinding">Langbinding</a></h2>
199<blockquote>
200This project to generalizes Boost.Python to work for other
201languages, initially Lua.  See discussions at
202<a class="reference" href="http://lists.sourceforge.net/lists/listinfo/boost-langbinding">http://lists.sourceforge.net/lists/listinfo/boost-langbinding</a></blockquote>
203</div>
204<div class="section" id="refactoring-and-reorganization">
205<h2><a class="toc-backref" href="#id25" name="refactoring-and-reorganization">Refactoring and Reorganization</a></h2>
206<blockquote>
207<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1673338">http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1673338</a></blockquote>
208</div>
209<div class="section" id="numarray-support-enhancements">
210<h2><a class="toc-backref" href="#id26" name="numarray-support-enhancements">NumArray Support Enhancements</a></h2>
211<blockquote>
212Consider integrating the enhancements described in
213<a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1757092">http://aspn.activestate.com/ASPN/Mail/Message/C++-sig/1757092</a></blockquote>
214</div>
215<div class="section" id="pyfinalize-safety">
216<h2><a class="toc-backref" href="#id27" name="pyfinalize-safety"><tt class="literal"><span class="pre">PyFinalize</span></tt> Safety</a></h2>
217<blockquote>
218<p>Currently Boost.Python has several global (or function-static)
219objects whose existence keeps reference counts from dropping to
220zero until the Boost.Python shared object is unloaded.  This can
221cause a crash because when the reference counts <em>do</em> go to zero,
222there's no interpreter.  In order to make it safe to call
223<tt class="literal"><span class="pre">PyFinalize()</span></tt> we must register an <tt class="literal"><span class="pre">atexit</span></tt> routine which
224destroys these objects and releases all Python reference counts
225so that Python can clean them up while there's still an
226interpreter.  <a class="reference" href="mailto:dirk-at-gerrits.homeip.net">Dirk Gerrits</a> has promised to do this job.</p>
227</blockquote>
228</div>
229</div>
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