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/*
* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _PY_UTILS_H
#define _PY_UTILS_H
#include "pyfstream.h"
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 register_optional_to_python : public boost::noncopyable
{
struct optional_to_python
{
static PyObject * convert(const boost::optional<T>& value)
{
return boost::python::incref
(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 =
reinterpret_cast<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>(*reinterpret_cast<T *>(data->convertible));
data->convertible = storage;
}
};
explicit register_optional_to_python() {
register_python_conversion<boost::optional<T>,
optional_to_python, optional_from_python>();
}
};
//boost::python::register_ptr_to_python< boost::shared_ptr<Base> >();
#endif // _PY_UTILS_H
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