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Editing: to_python_value.hpp

// 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/type_traits.hpp>
#include <boost/python/detail/value_is_shared_ptr.hpp>
#include <boost/python/detail/value_arg.hpp>

#include <boost/mpl/if.hpp>
#include <boost/mpl/or.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::get_pytype();
 }
};

template <>
struct object_manager_get_pytype<true>
{
 template <class U>
 static PyTypeObject const* get( U const& (*)() =0)
 {
 return converter::object_manager_traits::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

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 &> *) const {return converter::registered::converters.to_python_target_type();}
 template <class U>
 PyTypeObject const* get_pytype(boost::type<const shared_ptr &> *) const {return converter::registered::converters.to_python_target_type();}
# if !defined(BOOST_NO_CXX11_SMART_PTR)
 template <class U>
 PyTypeObject const* get_pytype(boost::type<std::shared_ptr &> *) const {return converter::registered::converters.to_python_target_type();}
 template <class U>
 PyTypeObject const* get_pytype(boost::type<const std::shared_ptr &> *) const {return converter::registered::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

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