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179 lines (149 loc) · 5.48 KB
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// Copyright David Abrahams 2002.
// Copyright Stefan Seefeld 2016.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef boost_python_to_python_value_hpp_
#define boost_python_to_python_value_hpp_
#include <boost/python/detail/prefix.hpp>
#include <boost/python/refcount.hpp>
#include <boost/python/tag.hpp>
#include <boost/python/handle.hpp>
#include <boost/python/converter/registry.hpp>
#include <boost/python/converter/registered.hpp>
#include <boost/python/converter/builtin_converters.hpp>
#include <boost/python/converter/object_manager.hpp>
#include <boost/python/converter/shared_ptr_to_python.hpp>
#include <boost/python/detail/value_is_shared_ptr.hpp>
#include <boost/python/detail/value_arg.hpp>
#include <boost/type_traits/transform_traits.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/or.hpp>
#include <boost/type_traits/is_const.hpp>
namespace boost { namespace python {
namespace detail
{
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
template <bool is_const_ref>
struct object_manager_get_pytype
{
template <class U>
static PyTypeObject const* get( U& (*)() =0)
{
return converter::object_manager_traits<U>::get_pytype();
}
};
template <>
struct object_manager_get_pytype<true>
{
template <class U>
static PyTypeObject const* get( U const& (*)() =0)
{
return converter::object_manager_traits<U>::get_pytype();
}
};
#endif
template <class T>
struct object_manager_to_python_value
{
typedef typename value_arg<T>::type argument_type;
PyObject* operator()(argument_type) const;
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
typedef boost::mpl::bool_<is_handle<T>::value> is_t_handle;
typedef boost::detail::indirect_traits::is_reference_to_const<T> is_t_const;
PyTypeObject const* get_pytype() const {
return get_pytype_aux((is_t_handle*)0);
}
inline static PyTypeObject const* get_pytype_aux(mpl::true_*) {return converter::object_manager_traits<T>::get_pytype();}
inline static PyTypeObject const* get_pytype_aux(mpl::false_* )
{
return object_manager_get_pytype<is_t_const::value>::get((T(*)())0);
}
#endif
// This information helps make_getter() decide whether to try to
// return an internal reference or not. I don't like it much,
// but it will have to serve for now.
BOOST_STATIC_CONSTANT(bool, uses_registry = false);
};
template <class T>
struct registry_to_python_value
{
typedef typename value_arg<T>::type argument_type;
PyObject* operator()(argument_type) const;
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
PyTypeObject const* get_pytype() const {return converter::registered<T>::converters.to_python_target_type();}
#endif
// This information helps make_getter() decide whether to try to
// return an internal reference or not. I don't like it much,
// but it will have to serve for now.
BOOST_STATIC_CONSTANT(bool, uses_registry = true);
};
template <class T>
struct shared_ptr_to_python_value
{
typedef typename value_arg<T>::type argument_type;
PyObject* operator()(argument_type) const;
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
PyTypeObject const* get_pytype() const {return get_pytype((boost::type<argument_type>*)0);}
#endif
// This information helps make_getter() decide whether to try to
// return an internal reference or not. I don't like it much,
// but it will have to serve for now.
BOOST_STATIC_CONSTANT(bool, uses_registry = false);
private:
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
template <class U>
PyTypeObject const* get_pytype(boost::type<shared_ptr<U> &> *) const {return converter::registered<U>::converters.to_python_target_type();}
template <class U>
PyTypeObject const* get_pytype(boost::type<const shared_ptr<U> &> *) const {return converter::registered<U>::converters.to_python_target_type();}
# if __cplusplus >= 201103L
template <class U>
PyTypeObject const* get_pytype(boost::type<std::shared_ptr<U> &> *) const {return converter::registered<U>::converters.to_python_target_type();}
template <class U>
PyTypeObject const* get_pytype(boost::type<const std::shared_ptr<U> &> *) const {return converter::registered<U>::converters.to_python_target_type();}
# endif
#endif
};
}
template <class T>
struct to_python_value
: mpl::if_<
detail::value_is_shared_ptr<T>
, detail::shared_ptr_to_python_value<T>
, typename mpl::if_<
mpl::or_<
converter::is_object_manager<T>
, converter::is_reference_to_object_manager<T>
>
, detail::object_manager_to_python_value<T>
, detail::registry_to_python_value<T>
>::type
>::type
{
};
//
// implementation
//
namespace detail
{
template <class T>
inline PyObject* registry_to_python_value<T>::operator()(argument_type x) const
{
return converter::registered<argument_type>::converters.to_python(&x);
}
template <class T>
inline PyObject* object_manager_to_python_value<T>::operator()(argument_type x) const
{
return python::upcast<PyObject>(
python::xincref(
get_managed_object(x, tag))
);
}
template <class T>
inline PyObject* shared_ptr_to_python_value<T>::operator()(argument_type x) const
{
return converter::shared_ptr_to_python(x);
}
}
}} // namespace boost::python
#endif