138 lines
5.3 KiB
C++
138 lines
5.3 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2007 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
//$Id$
|
|
|
|
#include <boost/optional/optional.hpp>
|
|
#include <boost/python.hpp>
|
|
|
|
// boost::optional<T> to/from converter from John Wiegley
|
|
|
|
template <typename T, typename TfromPy>
|
|
struct object_from_python
|
|
{
|
|
object_from_python() {
|
|
boost::python::converter::registry::push_back
|
|
(&TfromPy::convertible, &TfromPy::construct,
|
|
boost::python::type_id<T>());
|
|
}
|
|
};
|
|
|
|
template <typename T, typename TtoPy, typename TfromPy>
|
|
struct register_python_conversion
|
|
{
|
|
register_python_conversion() {
|
|
boost::python::to_python_converter<T, TtoPy>();
|
|
object_from_python<T, TfromPy>();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct python_optional : public boost::noncopyable
|
|
{
|
|
struct optional_to_python
|
|
{
|
|
static PyObject * convert(const boost::optional<T>& value)
|
|
{
|
|
return (value ? boost::python::to_python_value<T>()(*value) :
|
|
boost::python::detail::none());
|
|
}
|
|
};
|
|
|
|
struct optional_from_python
|
|
{
|
|
static void * convertible(PyObject * source)
|
|
{
|
|
using namespace boost::python::converter;
|
|
|
|
if (source == Py_None)
|
|
return source;
|
|
|
|
const registration& converters(registered<T>::converters);
|
|
|
|
if (implicit_rvalue_convertible_from_python(source,
|
|
converters)) {
|
|
rvalue_from_python_stage1_data data =
|
|
rvalue_from_python_stage1(source, converters);
|
|
return rvalue_from_python_stage2(source, data, converters);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void construct(PyObject * source,
|
|
boost::python::converter::rvalue_from_python_stage1_data * data)
|
|
{
|
|
using namespace boost::python::converter;
|
|
|
|
void * const storage = ((rvalue_from_python_storage<T> *)
|
|
data)->storage.bytes;
|
|
|
|
if (data->convertible == source) // == None
|
|
new (storage) boost::optional<T>(); // A Boost uninitialized value
|
|
else
|
|
new (storage) boost::optional<T>(*static_cast<T *>(data->convertible));
|
|
|
|
data->convertible = storage;
|
|
}
|
|
};
|
|
|
|
explicit python_optional() {
|
|
register_python_conversion<boost::optional<T>,
|
|
optional_to_python, optional_from_python>();
|
|
}
|
|
};
|
|
|
|
/** This class works around a bug in boost python.
|
|
|
|
See http://osdir.com/ml/python.c++/2003-11/msg00158.html
|
|
*/
|
|
template <typename T, typename X1 = boost::python::detail::not_specified, typename X2 = boost::python::detail::not_specified, typename X3 = boost::python::detail::not_specified>
|
|
class class_with_converter : public boost::python::class_<T, X1, X2, X3>
|
|
{
|
|
public:
|
|
typedef class_with_converter<T,X1,X2,X3> self;
|
|
// Construct with the class name, with or without docstring, and default __init__() function
|
|
class_with_converter(char const* name, char const* doc = 0) : boost::python::class_<T, X1, X2, X3>(name, doc) { }
|
|
|
|
// Construct with class name, no docstring, and an uncallable __init__ function
|
|
class_with_converter(char const* name, boost::python::no_init_t y) : boost::python::class_<T, X1, X2, X3>(name, y) { }
|
|
|
|
// Construct with class name, docstring, and an uncallable __init__ function
|
|
class_with_converter(char const* name, char const* doc, boost::python::no_init_t y) : boost::python::class_<T, X1, X2, X3>(name, doc, y) { }
|
|
|
|
// Construct with class name and init<> function
|
|
template <class DerivedT> class_with_converter(char const* name, boost::python::init_base<DerivedT> const& i)
|
|
: boost::python::class_<T, X1, X2, X3>(name, i) { }
|
|
|
|
// Construct with class name, docstring and init<> function
|
|
template <class DerivedT>
|
|
inline class_with_converter(char const* name, char const* doc, boost::python::init_base<DerivedT> const& i)
|
|
: boost::python::class_<T, X1, X2, X3>(name, doc, i) { }
|
|
|
|
template <class D>
|
|
self& def_readwrite_convert(char const* name, D const& d, char const* doc=0)
|
|
{
|
|
this->add_property(name,
|
|
boost::python::make_getter(d, boost::python::return_value_policy<boost::python::return_by_value>()),
|
|
boost::python::make_setter(d, boost::python::default_call_policies()));
|
|
return *this;
|
|
}
|
|
};
|