'[C++-sig] Python subclassing from C++'

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List:       python-cpp-sig
Subject:    [C++-sig] Python subclassing from C++
From:       "eric.frederich () siemens ! com" <eric ! frederich () siemens ! com>
Date:       2016-04-04 18:00:01
Message-ID: E6044A01E1F4C34482019F2682F5292D26F62596 () USLZUA0EM23MSX ! ww017 ! siemens ! net
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Hello,

I'd like to expose an std::map to Python.  I found a great example here:
https://sourceforge.net/p/cctbx/code/HEAD/tree/trunk/scitbx/stl/map_wrapper=
.h#l240

It implements a bunch of methods to make it act like a dict (hooray duck ty=
ping)
But I think it misses some like __eq__, __ne__, pop.

I think this could be done better by extending collections.MutableMapping.
This way you'd only have to implement the 5 abstract methods rather than th=
e 20 or so it currently does.
How can I do this?  Is it possible to define the parent class when creating=
 a Python class from C++ using boost::python::class_?

I haven't been able to find a way.

Thanks,
~Eric

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<div>Hello,</div>
<div>&nbsp;</div>
<div>I&#8217;d like to expose an std::map to Python.&nbsp; I found a great example \
here:</div> <div><a href="https://sourceforge.net/p/cctbx/code/HEAD/tree/trunk/scitbx/stl/map_wrapper.h#l240"><font \
color="blue"><u>https://sourceforge.net/p/cctbx/code/HEAD/tree/trunk/scitbx/stl/map_wrapper.h#l240</u></font></a></div>
 <div>&nbsp;</div>
<div>It implements a bunch of methods to make it act like a dict (hooray duck \
typing)</div> <div>But I think it misses some like __eq__, __ne__, pop.</div>
<div>&nbsp;</div>
<div>I think this could be done better by extending collections.MutableMapping.</div>
<div>This way you&#8217;d only have to implement the 5 abstract methods rather than \
the 20 or so it currently does.</div> <div>How can I do this?&nbsp; Is it possible to \
define the parent class when creating a Python class from C&#43;&#43; using \
boost::python::class_?</div> <div>&nbsp;</div>
<div>I haven&#8217;t been able to find a way.</div>
<div>&nbsp;</div>
<div>Thanks,</div>
<div>~Eric</div>
<div>&nbsp;</div>
<div><font face="Times New Roman" size="2"><span style="font-size:9pt;">This message \
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printing, copying, distributing, or using such information is strictly prohibited and \
may be unlawful. If you are not an intended recipient, you are hereby notified that \
you received this email in error, and that any review, dissemination, distribution or \
copying of this email and any attachment is strictly prohibited. If you have received \
this email in error, please contact the sender and delete the message and any \
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