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//
Copyright David Abrahams 2002.
//
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
RETURN_FROM_PYTHON_DWA200265_HPP
#
define
RETURN_FROM_PYTHON_DWA200265_HPP
#
include
<
boost/python/converter/from_python.hpp
>
#
include
<
boost/python/converter/rvalue_from_python_data.hpp
>
#
include
<
boost/python/converter/registered.hpp
>
#
include
<
boost/python/converter/registered_pointee.hpp
>
#
include
<
boost/python/converter/object_manager.hpp
>
#
include
<
boost/python/detail/void_ptr.hpp
>
#
include
<
boost/python/detail/void_return.hpp
>
#
include
<
boost/python/errors.hpp
>
#
include
<
boost/python/handle.hpp
>
#
include
<
boost/python/detail/type_traits.hpp
>
#
include
<
boost/mpl/and.hpp
>
#
include
<
boost/mpl/bool.hpp
>
namespace
boost
{
namespace
python
{
namespace
converter
{
template
<
class
T
>
struct
is_object_manager
;
namespace
detail
{
template
<
class
T
>
struct
return_pointer_from_python
{
typedef
T result_type;
T
operator
()(PyObject*)
const
;
};
template
<
class
T
>
struct
return_reference_from_python
{
typedef
T result_type;
T
operator
()(PyObject*)
const
;
};
template
<
class
T
>
struct
return_rvalue_from_python
{
typedef
T result_type;
return_rvalue_from_python
();
result_type
operator
()(PyObject*);
private:
rvalue_from_python_data<T> m_data;
};
template
<
class
T
>
struct
return_object_manager_from_python
{
typedef
T result_type;
result_type
operator
()(PyObject*)
const
;
};
template
<
class
T
>
struct
select_return_from_python
{
BOOST_STATIC_CONSTANT
(
bool
, obj_mgr = is_object_manager<T>::value);
BOOST_STATIC_CONSTANT
(
bool
, ptr = is_pointer<T>::value);
BOOST_STATIC_CONSTANT
(
bool
, ref = is_reference<T>::value);
typedef
typename
mpl::if_c<
obj_mgr
, return_object_manager_from_python<T>
,
typename
mpl::if_c<
ptr
, return_pointer_from_python<T>
,
typename
mpl::if_c<
ref
, return_reference_from_python<T>
, return_rvalue_from_python<T>
>::type
>::type
>::type type;
};
}
template
<
class
T
>
struct
return_from_python
: detail::select_return_from_python<T>::type
{
};
//
Specialization as a convenience for call and call_method
template
<>
struct
return_from_python
<
void
>
{
typedef
python::detail::returnable<
void
>::type result_type;
result_type
operator
()(PyObject* x)
const
{
(void_result_from_python)(x);
#
ifdef
BOOST_NO_VOID_RETURNS
return
result_type
();
#
endif
}
};
//
//
Implementations
//
namespace
detail
{
template
<
class
T
>
inline
return_rvalue_from_python<T>::return_rvalue_from_python()
: m_data(
const_cast
<registration*>(®istered<T>::converters)
)
{
}
template
<
class
T
>
inline
typename
return_rvalue_from_python<T>::result_type
return_rvalue_from_python<T>::
operator
()(PyObject* obj)
{
//
Take possession of the source object here. If the result is in
//
fact going to be a copy of an lvalue embedded in the object,
//
and we take possession inside rvalue_result_from_python, it
//
will be destroyed too early.
handle<>
holder
(obj);
return
*(T*)
(rvalue_result_from_python)(obj, m_data.
stage1
);
}
template
<
class
T
>
inline
T return_reference_from_python<T>::
operator
()(PyObject* obj)
const
{
return
python::detail::void_ptr_to_reference
(
(reference_result_from_python)(obj, registered<T>::converters)
, (
T
(*)())
0
);
}
template
<
class
T
>
inline
T return_pointer_from_python<T>::
operator
()(PyObject* obj)
const
{
return
T
(
(pointer_result_from_python)(obj, registered_pointee<T>::converters)
);
}
template
<
class
T
>
inline
T return_object_manager_from_python<T>::
operator
()(PyObject* obj)
const
{
return
T
(
object_manager_traits<T>::
adopt
(
expect_non_null
(obj))
);
}
}
}}}
//
namespace boost::python::converter
#
endif
//
RETURN_FROM_PYTHON_DWA200265_HPP
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