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- [section boost/python/opaque_pointer_converter.hpp]
- [section Introduction]
- `opaque<>` registers itself as a converter from Python objects to pointers to undefined types and vice versa.
- ``
- namespace boost { namespace python
- {
- template<class Pointee>
- struct opaque
- {
- opaque();
- };
- }}
- ``
- [endsect]
- [section Class template `opaque` constructor]
- ``opaque();``
- [variablelist
- [[Effects][
- * Registers the instance as a [link to_from_python_type_conversion.boost_python_lvalue_from_pytype_.class_template_lvalue_from_pytyp `lvalue_from_pytype`] converter from Python objects into opaque pointers.
- The Python Objects created are named after the type pointed to by the opaque pointer being wrapped.
- * Registers the instance as a [link to_from_python_type_conversion.boost_python_to_python_converter.class_template_to_python_convert `to_python_converter`] from opaque pointers to Python objects.
- ]]
- ]
- [note If there is already an instance registered by another module, this instance doesn't try to register again in order to avoid warnings about multiple registrations.]
- [endsect]
- [section Macro `BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(Pointee)`]
- This macro must be used to define specializations of the [link utility_and_infrastructure.boost_python_type_id_hpp.functions `type_id`] function which can't be instantiated for incomplete types.
- [note The macro must be invoked in every translation unit which uses the opaque converter.]
- [endsect]
- [endsect]
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