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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 ARG_TO_PYTHON_DWA200265_HPP
# define ARG_TO_PYTHON_DWA200265_HPP
# include <boost/python/ptr.hpp>
# include <boost/python/tag.hpp>
# include <boost/python/to_python_indirect.hpp>
# include <boost/python/converter/registered.hpp>
# include <boost/python/converter/registered_pointee.hpp>
# include <boost/python/converter/arg_to_python_base.hpp>
# include <boost/python/converter/shared_ptr_to_python.hpp>
// Bring in specializations
# include <boost/python/converter/builtin_converters.hpp>
# include <boost/python/object/function_handle.hpp>
# include <boost/python/base_type_traits.hpp>
# include <boost/python/detail/indirect_traits.hpp>
# include <boost/python/detail/convertible.hpp>
# include <boost/python/detail/string_literal.hpp>
# include <boost/python/detail/value_is_shared_ptr.hpp>
# include <boost/type_traits/cv_traits.hpp>
# include <boost/type_traits/composite_traits.hpp>
# include <boost/type_traits/function_traits.hpp>
# include <boost/mpl/or.hpp>
namespace boost { namespace python { namespace converter {
template <class T> struct is_object_manager;
namespace detail
{
template <class T>
struct function_arg_to_python : handle<>
{
function_arg_to_python(T const& x);
};
template <class T>
struct reference_arg_to_python : handle<>
{
reference_arg_to_python(T& x);
private:
static PyObject* get_object(T& x);
};
template <class T>
struct shared_ptr_arg_to_python : handle<>
{
shared_ptr_arg_to_python(T const& x);
private:
static PyObject* get_object(T& x);
};
template <class T>
struct value_arg_to_python : arg_to_python_base
{
// Throw an exception if the conversion can't succeed
value_arg_to_python(T const&);
};
template <class Ptr>
struct pointer_deep_arg_to_python : arg_to_python_base
{
// Throw an exception if the conversion can't succeed
pointer_deep_arg_to_python(Ptr);
};
template <class Ptr>
struct pointer_shallow_arg_to_python : handle<>
{
// Throw an exception if the conversion can't succeed
pointer_shallow_arg_to_python(Ptr);
private:
static PyObject* get_object(Ptr p);
};
// Convert types that manage a Python object to_python
template <class T>
struct object_manager_arg_to_python
{
object_manager_arg_to_python(T const& x) : m_src(x) {}
PyObject* get() const
{
return python::upcast<PyObject>(get_managed_object(m_src, tag));
}
private:
T const& m_src;
};
template <class T>
struct select_arg_to_python
{
typedef typename unwrap_reference<T>::type unwrapped_referent;
typedef typename unwrap_pointer<T>::type unwrapped_ptr;
typedef typename mpl::if_<
// Special handling for char const[N]; interpret them as char
// const* for the sake of conversion
python::detail::is_string_literal<T const>
, arg_to_python<char const*>
, typename mpl::if_<
python::detail::value_is_shared_ptr<T>
, shared_ptr_arg_to_python<T>
, typename mpl::if_<
mpl::or_<
is_function<T>
, indirect_traits::is_pointer_to_function<T>
, is_member_function_pointer<T>
>
, function_arg_to_python<T>
, typename mpl::if_<
is_object_manager<T>
, object_manager_arg_to_python<T>
, typename mpl::if_<
is_pointer<T>
, pointer_deep_arg_to_python<T>
, typename mpl::if_<
is_pointer_wrapper<T>
, pointer_shallow_arg_to_python<unwrapped_ptr>
, typename mpl::if_<
is_reference_wrapper<T>
, reference_arg_to_python<unwrapped_referent>
, value_arg_to_python<T>
>::type
>::type
>::type
>::type
>::type
>::type
>::type
type;
};
}
template <class T>
struct arg_to_python
: detail::select_arg_to_python<T>::type
{
typedef typename detail::select_arg_to_python<T>::type base;
public: // member functions
// Throw an exception if the conversion can't succeed
arg_to_python(T const& x);
};
//
// implementations
//
namespace detail
{
// reject_raw_object_ptr -- cause a compile-time error if the user
// should pass a raw Python object pointer
using python::detail::yes_convertible;
using python::detail::no_convertible;
using python::detail::unspecialized;
template <class T> struct cannot_convert_raw_PyObject;
template <class T, class Convertibility>
struct reject_raw_object_helper
{
static void error(Convertibility)
{
cannot_convert_raw_PyObject<T*>::to_python_use_handle_instead();
}
static void error(...) {}
};
template <class T>
inline void reject_raw_object_ptr(T*)
{
reject_raw_object_helper<T,yes_convertible>::error(
python::detail::convertible<PyObject const volatile*>::check((T*)0));
typedef typename remove_cv<T>::type value_type;
reject_raw_object_helper<T,no_convertible>::error(
python::detail::convertible<unspecialized*>::check(
(base_type_traits<value_type>*)0
));
}
// ---------
template <class T>
inline function_arg_to_python<T>::function_arg_to_python(T const& x)
: handle<>(python::objects::make_function_handle(x))
{
}
template <class T>
inline value_arg_to_python<T>::value_arg_to_python(T const& x)
: arg_to_python_base(&x, registered<T>::converters)
{
}
template <class Ptr>
inline pointer_deep_arg_to_python<Ptr>::pointer_deep_arg_to_python(Ptr x)
: arg_to_python_base(x, registered_pointee<Ptr>::converters)
{
detail::reject_raw_object_ptr((Ptr)0);
}
template <class T>
inline PyObject* reference_arg_to_python<T>::get_object(T& x)
{
to_python_indirect<T&,python::detail::make_reference_holder> convert;
return convert(x);
}
template <class T>
inline reference_arg_to_python<T>::reference_arg_to_python(T& x)
: handle<>(reference_arg_to_python<T>::get_object(x))
{
}
template <class T>
inline shared_ptr_arg_to_python<T>::shared_ptr_arg_to_python(T const& x)
: handle<>(shared_ptr_to_python(x))
{
}
template <class Ptr>
inline pointer_shallow_arg_to_python<Ptr>::pointer_shallow_arg_to_python(Ptr x)
: handle<>(pointer_shallow_arg_to_python<Ptr>::get_object(x))
{
detail::reject_raw_object_ptr((Ptr)0);
}
template <class Ptr>
inline PyObject* pointer_shallow_arg_to_python<Ptr>::get_object(Ptr x)
{
to_python_indirect<Ptr,python::detail::make_reference_holder> convert;
return convert(x);
}
}
template <class T>
inline arg_to_python<T>::arg_to_python(T const& x)
: base(x)
{}
}}} // namespace boost::python::converter
#endif // ARG_TO_PYTHON_DWA200265_HPP
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