Murray Cumming schrieb am Montag 23 Februar 2009 um 12:39:
> I'm trying to support this notation in python:
> something = record["somefieldname"]
[snip]
> I'm now trying to do this with boost::python, like so, because googling
> has suggested that this should work:
>
> boost::python::class_<Glom::PyGlomRecord>("Record")
> .def("__getitem__", &Glom::PyGlomRecord::getitem)
> .def("__len__", &Glom::PyGlomRecord::len)
>
> But when I try to use that in Python, I get this error:
> "Boost.Python.class' object is unsubscriptable"
>
> Is there something else that I need to do?
I assume Glom::PyGlomRecord::getitem hasn't the right signature, which isn't
checked at compile time
{{{
struct PyGlomRecord
{
whatever_type getitem(boost::python::object subscriptionObj);
};
}}}
Here is an working example
{{{
#include <boost/python.hpp>
namespace bp = boost::python;
struct Subscriptable
{
double val;
double getitem(bp::object subscriptionObj)
{
return this->val;
}
double setitem(bp::object subscriptionObj, double val)
{
this->val = val;
}
};
BOOST_PYTHON_MODULE(mypy)
{
bp::class_<Subscriptable>("Subscriptable")
.def("__getitem__", &Subscriptable::getitem)
.def("__setitem__", &Subscriptable::setitem);
}
}}}
HTH,
-- Maik
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