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Improve MPL idiomatic usage

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[SVN r28945]
This commit is contained in:
Dave Abrahams
2005-05-16 02:01:35 +00:00
parent c876db8cae
commit 02c0b2b486
1 changed files with 38 additions and 46 deletions
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84
include/boost/python/converter/arg_from_python.hpp
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@@ -11,7 +11,12 @@
# include <boost/type_traits/transform_traits.hpp>
# include <boost/type_traits/cv_traits.hpp>
# include <boost/python/converter/rvalue_from_python_data.hpp>
# include <boost/mpl/eval_if.hpp>
# include <boost/mpl/if.hpp>
# include <boost/mpl/identity.hpp>
# include <boost/mpl/and.hpp>
# include <boost/mpl/or.hpp>
# include <boost/mpl/not.hpp>
# include <boost/python/converter/registry.hpp>
# include <boost/python/converter/registered.hpp>
# include <boost/python/converter/registered_pointee.hpp>
@@ -141,60 +146,47 @@ struct back_reference_arg_from_python
// ==================
template <class C, class T, class F>
struct if_2
: mpl::eval_if<C, mpl::identity<T>, F>
{};
// This metafunction selects the appropriate arg_from_python converter
// type for an argument of type T.
template <class T>
struct select_arg_from_python
{
BOOST_STATIC_CONSTANT(
bool, obj_mgr = is_object_manager<T>::value);
BOOST_STATIC_CONSTANT(
bool, obj_mgr_ref = is_reference_to_object_manager<T>::value);
BOOST_STATIC_CONSTANT(
bool, ptr = is_pointer<T>::value);
BOOST_STATIC_CONSTANT(
bool, ptr_cref
= indirect_traits::is_reference_to_pointer<T>::value
&& indirect_traits::is_reference_to_const<T>::value
&& !indirect_traits::is_reference_to_volatile<T>::value);
BOOST_STATIC_CONSTANT(
bool, ref =
indirect_traits::is_reference_to_non_const<T>::value
|| indirect_traits::is_reference_to_volatile<T>::value);
BOOST_STATIC_CONSTANT(
bool, back_ref =
boost::python::is_back_reference<T>::value);
typedef typename mpl::if_c<
obj_mgr
, object_manager_value_arg_from_python<T>
, typename mpl::if_c<
obj_mgr_ref
, object_manager_ref_arg_from_python<T>
, typename mpl::if_c<
ptr
, pointer_arg_from_python<T>
, typename mpl::if_c<
ptr_cref
, pointer_cref_arg_from_python<T>
, typename mpl::if_c<
ref
typedef typename if_2<
is_object_manager<T>
, object_manager_value_arg_from_python<T>
, if_2<
is_reference_to_object_manager<T>
, object_manager_ref_arg_from_python<T>
, if_2<
is_pointer<T>
, pointer_arg_from_python<T>
, if_2<
mpl::and_<
indirect_traits::is_reference_to_pointer<T>
, indirect_traits::is_reference_to_const<T>
, mpl::not_<indirect_traits::is_reference_to_volatile<T> >
>
, pointer_cref_arg_from_python<T>
, if_2<
mpl::or_<
indirect_traits::is_reference_to_non_const<T>
, indirect_traits::is_reference_to_volatile<T>
>
, reference_arg_from_python<T>
, typename mpl::if_c<
back_ref
, mpl::if_<
boost::python::is_back_reference<T>
, back_reference_arg_from_python<T>
, arg_rvalue_from_python<T>
>::type
>::type
>::type
>::type
>::type
>
>
>
>
>
>::type type;
};