[C++-sig] Keyed properties? (original) (raw)

Matthew Scouten (TT) Matthew.Scouten at tradingtechnologies.com
Tue Aug 4 15:44:12 CEST 2009

You can solve it pretty much the same way. Expose a function *etitem.

It would look something like this:

void set(thingy_t thingy&, int index, value_type& val){...} value_type get(const thingy_t thingy&, int index ){...}

And then you export them in the class_ exposer:

class_< thingy_t >("thingy_t") .def("getstate", &get) .def("setstate", &set)

One wrinkle to watch out for: remember not to name the c++ functions starting with '__' Initial double underscores are reserved for the compiler.

-----Original Message----- From: cplusplus-sig-bounces+matthew.scouten=tradingtechnologies.com at python.org [mailto:cplusplus-sig-bounces+matthew.scouten=tradingtechnologies.com at py thon.org] On Behalf Of Jakob van Santen Sent: Tuesday, August 04, 2009 8:23 AM To: cplusplus-sig at python.org Subject: [C++-sig] Keyed properties?

Hello,

I'm in the process of hiding the unnecessarily verbose parts of a C++
interface behind Python properties, and I've run in to a slight
problem. We have a bunch of classes that expose private std::vectors
via Get(int index) and Set(int index, value_type& val) methods.
Ideally, I'd like to replace

thingy.GetATWDGain(1) thingy.SetATWDGain(1, 254.5)

with

thingy.atwd_gain[1] thingy.atwd_gain[1] = 254.5

I know how I would solve this in pure Python (something similar to
this: http://code.activestate.com/recipes/440514/), but I'm wondering
if there's a clever way to do this in Boost.Python without messing
around with the library itself. If anyone has done this already, I'd
be curious to know how.

Cheers, Jakob van Santen

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