¿ÂÃÍ <[EMAIL PROTECTED]> writes:
> Hi:
>
> I'm now use the boost.python,and want to write my own converter.
> In the last version,I can write like this:
>
> #include <boost/python/class_builder.hpp>
> namespace python = boost::python;
> BOOST_PYTHON_BEGIN_CONVERSION_NAMESPACE
> inline AsnInt from_python(PyObject* p, python::type<const AsnInt&>)
> {
> return AsnInt(from_python(p, python::type<int>()));
> }
> inline AsnInt from_python(PyObject* p, python::type<AsnInt>)
> {
> return from_python(p, python::type<const AsnInt&>());
> }
> inline PyObject* to_python(const AsnInt& ai)
> {
> return PyInt_FromLong((AsnIntType)ai);
> }
> BOOST_PYTHON_END_CONVERSION_NAMESPACE
>
>
> In this new version, what can I do for the same work? Please give me some examples,
> Thank you very much!
This is unsupported interface in v2, because it will probably change a
bit before it becomes supported in the next major release (to make it
easier), but here goes:
// Untested!!
PyObject* AsnInt_to_python(void const* x)
{
AsnInt const& ai = *(AsnInt const*)x;
return PyInt_FromLong((AsnIntType)ai);
}
struct AsnInt_rvalue_from_python
{
static void* convertible(PyObject* obj)
{
return (PyInt_Check(obj) || PyLong_Check(obj))
? obj : 0;
}
static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)
{
// Get the (intermediate) source object
unaryfunc creator = &obj->ob_type->tp_as_number->nb_int;
handle<> intermediate(creator(obj));
// Get the location in which to construct
void* storage = ((rvalue_from_python_storage<AsnInt>*)data)->storage.bytes;
new (storage) AsnInt(PyInt_As_Long(intermediate.get()));
// record successful construction
data->convertible = storage;
}
};
...
boost::python::converter::registry::insert(
AsnInt_to_python, type_id<AsnInt>());
boost::python::converter::registry::insert(
AsnInt_rvalue_from_python::convertible
, AsnInt_rvalue_from_python::construct
, type_id<AsnInt>());
--
David Abrahams
[EMAIL PROTECTED] * http://www.boost-consulting.com
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