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/*****************************************************************************
*
* 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
*
*****************************************************************************/
#include <boost/optional/optional.hpp>
#include <boost/python.hpp>
#include <mapnik/noncopyable.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 mapnik::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 0;
}
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>();
}
};
// to/from boost::optional<bool>
template <>
struct python_optional<float> : public mapnik::noncopyable
{
struct optional_to_python
{
static PyObject * convert(const boost::optional<float>& value)
{
return (value ? PyFloat_FromDouble(*value) :
boost::python::detail::none());
}
};
struct optional_from_python
{
static void * convertible(PyObject * source)
{
using namespace boost::python::converter;
if (source == Py_None || PyFloat_Check(source))
return source;
return 0;
}
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<boost::optional<bool> > *)
data)->storage.bytes;
if (source == Py_None) // == None
new (storage) boost::optional<float>(); // A Boost uninitialized value
else
new (storage) boost::optional<float>(PyFloat_AsDouble(source));
data->convertible = storage;
}
};
explicit python_optional()
{
register_python_conversion<boost::optional<float>,
optional_to_python, optional_from_python>();
}
};
// to/from boost::optional<float>
template <>
struct python_optional<bool> : public mapnik::noncopyable
{
struct optional_to_python
{
static PyObject * convert(const boost::optional<bool>& value)
{
if (value)
{
if (*value) Py_RETURN_TRUE;
else Py_RETURN_FALSE;
}
else return boost::python::detail::none();
}
};
struct optional_from_python
{
static void * convertible(PyObject * source)
{
using namespace boost::python::converter;
if (source == Py_None || PyBool_Check(source))
return source;
return 0;
}
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<boost::optional<bool> > *)
data)->storage.bytes;
if (source == Py_None) // == None
new (storage) boost::optional<bool>(); // A Boost uninitialized value
else
{
new (storage) boost::optional<bool>(source == Py_True ? true : false);
}
data->convertible = storage;
}
};
explicit python_optional()
{
register_python_conversion<boost::optional<bool>,
optional_to_python, optional_from_python>();
}
};
// This class works around a feature 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;
}
};
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