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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Gustavo,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think you win some sort of prize for not only fastest mailing
list responses, but also fastest implementation of features. I reviewed the
diff, and changed what I was adding to the global annotations table for these
pointers to “{‘return_internal_reference’:’true’}” – this seems to be what the
new code in foo.h was doing. I am still getting the errors, though – is this
the right way of using it?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>And just to make sure, I grabbed a new checkout of pybindgen and
re-installed it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
cplusplus-sig-bounces+bfitzpatrick=vtiinstruments.com@python.org
[mailto:cplusplus-sig-bounces+bfitzpatrick=vtiinstruments.com@python.org] <b>On
Behalf Of </b>Gustavo Carneiro<br>
<b>Sent:</b> Wednesday, January 20, 2010 1:18 PM<br>
<b>To:</b> Development of Python/C++ integration<br>
<b>Subject:</b> Re: [C++-sig] Boost-python/pybindgen and wrapping member
variables<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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<p class=MsoNormal>On Wed, Jan 20, 2010 at 5:43 PM, Ben Fitzpatrick <<a
href="mailto:bfitzpatrick@vtiinstruments.com">bfitzpatrick@vtiinstruments.com</a>>
wrote:<o:p></o:p></p>
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<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi
everyone,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
think I’m finally getting the hang of this, I seem to have gotten almost
everything in my project working thanks to Gustavo’s latest pybindgen patch.
One of the remaining things I am having difficulty with is putting annotations
on member variables of a class. I have something of the form:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>class
foo{<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <stuff><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>};<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>class
baz {<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>
public:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>
foo* var;<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>}<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The
error I am getting from pybindgen is “WrapperWarning: Return value ‘::foo *’
error (used in baz::var [variable]): TypeConfigurationError(‘Either
caller_owns_return or self.reference_existing_object must be given’)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> I
know that the issue is that I need to stick an annotation on there. Since the
pointer is allocated and tracked by the underlying C++ code, I’m pretty sure
that I need to put reference_existing_object on it. I’ve tried inserting
“{‘reference_existing_object’ : ‘true’}” into the global_annotations table, and
also inserting it into the parameter_annotations[“return”] dictionary. For
kicks, I even tried both at once. No matter what I do I can’t get rid of the error,
or see it show up in my final build, which leads me to believe there’s
something I’m missing. I went and looked up the documentation for
reference_existing_object, but of course none of their examples show how you
could use it on a member variable. What am I missing?<o:p></o:p></p>
</div>
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<div>
<p class=MsoNormal>You are not missing anything. Annotations for member
variables (pybindgen calls them "instance attributes") were not
implemented. <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>An oversight easily fixed:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><a
href="http://bazaar.launchpad.net/~gjc/pybindgen/trunk/revision/742">http://bazaar.launchpad.net/~gjc/pybindgen/trunk/revision/742</a><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;
margin-left:4.8pt;margin-right:0in'>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Ben
Fitzpatrick<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><br>
_______________________________________________<br>
Cplusplus-sig mailing list<br>
<a href="mailto:Cplusplus-sig@python.org">Cplusplus-sig@python.org</a><br>
<a href="http://mail.python.org/mailman/listinfo/cplusplus-sig" target="_blank">http://mail.python.org/mailman/listinfo/cplusplus-sig</a><o:p></o:p></p>
</blockquote>
</div>
<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Gustavo J. A. M. Carneiro<br>
INESC Porto, Telecommunications and Multimedia Unit<br>
"The universe is always one step beyond logic." -- Frank Herbert<o:p></o:p></p>
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