python/include/boost/python/to_python_value.hpp at develop · FadyEssam/python · GitHub

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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/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

// 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 &> *) 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

{

};

// 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

python/include/boost/python/to_python_value.hpp at develop · FadyEssam/python · GitHub

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