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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 EXTRACT_DWA200265_HPP
# define EXTRACT_DWA200265_HPP
# include <boost/python/detail/prefix.hpp>
# include <boost/python/converter/object_manager.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/object_core.hpp>
# include <boost/python/refcount.hpp>
# include <boost/python/detail/copy_ctor_mutates_rhs.hpp>
# include <boost/python/detail/void_ptr.hpp>
# include <boost/python/detail/void_return.hpp>
# include <boost/utility.hpp>
# include <boost/call_traits.hpp>
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) || BOOST_WORKAROUND(BOOST_INTEL_WIN, <= 900)
// workaround for VC++ 6.x or 7.0
# define BOOST_EXTRACT_WORKAROUND ()
#else
# define BOOST_EXTRACT_WORKAROUND
#endif
namespace boost { namespace python {
namespace api
{
class object;
}
namespace converter
{
template <class Ptr>
struct extract_pointer
{
typedef Ptr result_type;
extract_pointer(PyObject*);
bool check() const;
Ptr operator()() const;
private:
PyObject* m_source;
void* m_result;
};
template <class Ref>
struct extract_reference
{
typedef Ref result_type;
extract_reference(PyObject*);
bool check() const;
Ref operator()() const;
private:
PyObject* m_source;
void* m_result;
};
template <class T>
struct extract_rvalue : private noncopyable
{
typedef typename mpl::if_<
python::detail::copy_ctor_mutates_rhs<T>
, T&
, typename call_traits<T>::param_type
>::type result_type;
extract_rvalue(PyObject*);
bool check() const;
result_type operator()() const;
private:
PyObject* m_source;
mutable rvalue_from_python_data<T> m_data;
};
template <class T>
struct extract_object_manager
{
typedef T result_type;
extract_object_manager(PyObject*);
bool check() const;
result_type operator()() const;
private:
PyObject* m_source;
};
template <class T>
struct select_extract
{
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
, extract_object_manager<T>
, typename mpl::if_c<
ptr
, extract_pointer<T>
, typename mpl::if_c<
ref
, extract_reference<T>
, extract_rvalue<T>
>::type
>::type
>::type type;
};
}
template <class T>
struct extract
: converter::select_extract<T>::type
{
private:
typedef typename converter::select_extract<T>::type base;
public:
typedef typename base::result_type result_type;
operator result_type() const
{
return (*this)();
}
extract(PyObject*);
extract(api::object const&);
};
//
// Implementations
//
template <class T>
inline extract<T>::extract(PyObject* o)
: base(o)
{
}
template <class T>
inline extract<T>::extract(api::object const& o)
: base(o.ptr())
{
}
namespace converter
{
template <class T>
inline extract_rvalue<T>::extract_rvalue(PyObject* x)
: m_source(x)
, m_data(
(rvalue_from_python_stage1)(x, registered<T>::converters)
)
{
}
template <class T>
inline bool
extract_rvalue<T>::check() const
{
return m_data.stage1.convertible;
}
template <class T>
inline typename extract_rvalue<T>::result_type
extract_rvalue<T>::operator()() const
{
return *(T*)(
// Only do the stage2 conversion once
m_data.stage1.convertible == m_data.storage.bytes
? m_data.storage.bytes
: (rvalue_from_python_stage2)(m_source, m_data.stage1, registered<T>::converters)
);
}
template <class Ref>
inline extract_reference<Ref>::extract_reference(PyObject* obj)
: m_source(obj)
, m_result(
(get_lvalue_from_python)(obj, registered<Ref>::converters)
)
{
}
template <class Ref>
inline bool extract_reference<Ref>::check() const
{
return m_result != 0;
}
template <class Ref>
inline Ref extract_reference<Ref>::operator()() const
{
if (m_result == 0)
(throw_no_reference_from_python)(m_source, registered<Ref>::converters);
return python::detail::void_ptr_to_reference(m_result, (Ref(*)())0);
}
template <class Ptr>
inline extract_pointer<Ptr>::extract_pointer(PyObject* obj)
: m_source(obj)
, m_result(
obj == Py_None ? 0 : (get_lvalue_from_python)(obj, registered_pointee<Ptr>::converters)
)
{
}
template <class Ptr>
inline bool extract_pointer<Ptr>::check() const
{
return m_source == Py_None || m_result != 0;
}
template <class Ptr>
inline Ptr extract_pointer<Ptr>::operator()() const
{
if (m_result == 0 && m_source != Py_None)
(throw_no_pointer_from_python)(m_source, registered_pointee<Ptr>::converters);
return Ptr(m_result);
}
template <class T>
inline extract_object_manager<T>::extract_object_manager(PyObject* obj)
: m_source(obj)
{
}
template <class T>
inline bool extract_object_manager<T>::check() const
{
return object_manager_traits<T>::check(m_source);
}
template <class T>
inline T extract_object_manager<T>::operator()() const
{
return T(
object_manager_traits<T>::adopt(python::incref(m_source))
);
}
}
}} // namespace boost::python::converter
#endif // EXTRACT_DWA200265_HPP
|
