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enable conversion from Py_None to mapnik::value_null - refs #1642,#794

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This commit is contained in:
Dane Springmeyer 2012-12-11 18:13:33 -08:00
parent a4f3be02b5
commit 2353deced4
1 changed files with 35 additions and 0 deletions
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35
bindings/python/mapnik_feature.cpp
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@ -156,18 +156,53 @@ struct UnicodeString_from_python_str
}
};
struct value_null_from_python
{
value_null_from_python()
{
boost::python::converter::registry::push_back(
&convertible,
&construct,
boost::python::type_id<mapnik::value_null>());
}
static void* convertible(PyObject* obj_ptr)
{
if (obj_ptr == Py_None) return obj_ptr;
return 0;
}
static void construct(
PyObject* obj_ptr,
boost::python::converter::rvalue_from_python_stage1_data* data)
{
if (obj_ptr != Py_None) boost::python::throw_error_already_set();
void* storage = (
(boost::python::converter::rvalue_from_python_storage<mapnik::value_null>*)
data)->storage.bytes;
new (storage) mapnik::value_null();
data->convertible = storage;
}
};
void export_feature()
{
using namespace boost::python;
using mapnik::Feature;
// Python to mapnik::value converters
// NOTE: order matters here. For example value_null must be listed before
// bool otherwise Py_None will be interpreted as bool (false)
implicitly_convertible<int,mapnik::value>();
implicitly_convertible<double,mapnik::value>();
implicitly_convertible<UnicodeString,mapnik::value>();
implicitly_convertible<mapnik::value_null,mapnik::value>();
implicitly_convertible<bool,mapnik::value>();
// http://misspent.wordpress.com/2009/09/27/how-to-write-boost-python-converters/
UnicodeString_from_python_str();
value_null_from_python();
class_<context_type,context_ptr,boost::noncopyable>
("Context",init<>("Default ctor."))