On May 10, 2013, at 11:10 , Wichert Akkerman <wich...@wiggy.net> wrote:
> On May 9, 2013, at 12:34 , Alex Leach <beamesle...@gmail.com> wrote:
>> On Thu, 09 May 2013 07:55:07 +0100, Wichert Akkerman <wich...@wiggy.net>
>> wrote:
>>
>> On May 8, 2013, at 23:31 , "Alex Leach" <beamesle...@gmail.com> wrote:
>>
>>> That error means the type_id of uuid is not in the bp registry.
>>>
>>> I think you can fix this by deriving uuid_to_python from
>>> to_python_converter, as demonstrated in the pytype_function example[1].
>>> This will add the get_pytype function call, and on initialisation, should
>>> hopefully add what's missing: a call to `registry::lookup`[2].
>>
>> I'm afraid that doesn't work. To test this I changes my converter struct to
>> derive from bp::converter::wrap_pyttype<&PyStringType> and pass
>> has_get_type=true to the to_python_converter call, but I still get the exact
>> same error.
>>
>> Fair enough. I see your conversion function doesn't use bp::object, but a
>> raw PyObject instead. Using a bp::object might do the registration for
>> you.. Probably not. Alternatively, you could try adding this to your
>> registration code:-
>>
>>
>> converter::registration& uuid_converter
>> = const_cast<converter::registration&>(
>> converter::registry::lookup(type_id<boost::uuids::uuid>()) );
>>
>> uuid_converter.m_class_object =
>> # if PY_VERSION_HEX >= 0x03000000
>> &PyUnicode_Type;
>> #else
>> &PyString_Type;
>> #endif
>>
>>
>> That will get you past the current error, at least, but there's probably an
>> easier solution…
>
> That seems to do something! But still not quite there:
>
> >>> a.uuid
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: cannot create weak reference to 'str' object
> >>> u=a.uuid
> zsh: segmentation fault
Which can be fixed by not using def_readwrite but a property with a getting
returning a new value instead of a reference:
.add_property("uuid",
bp::make_getter(&Article::uuid,
bp::return_value_policy<bp::return_by_value>()),
bp::make_setter(&Article::uuid))
After which everything seems to work!
Wichert.
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