69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
// 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 BASES_DWA2002321_HPP
|
|
# define BASES_DWA2002321_HPP
|
|
|
|
# include <boost/python/detail/prefix.hpp>
|
|
# include <boost/type_traits/object_traits.hpp>
|
|
# include <boost/python/detail/type_list.hpp>
|
|
# include <boost/mpl/if.hpp>
|
|
# include <boost/mpl/bool.hpp>
|
|
# include <boost/preprocessor/enum_params_with_a_default.hpp>
|
|
# include <boost/preprocessor/enum_params.hpp>
|
|
|
|
namespace boost { namespace python {
|
|
|
|
# define BOOST_PYTHON_BASE_PARAMS BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, Base)
|
|
|
|
// A type list for specifying bases
|
|
template < BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_PYTHON_MAX_BASES, typename Base, mpl::void_) >
|
|
struct bases : detail::type_list< BOOST_PYTHON_BASE_PARAMS >::type
|
|
{};
|
|
|
|
namespace detail
|
|
{
|
|
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
|
template <class T> struct specifies_bases
|
|
: mpl::false_
|
|
{
|
|
};
|
|
|
|
template < BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, class Base) >
|
|
struct specifies_bases< bases< BOOST_PYTHON_BASE_PARAMS > >
|
|
: mpl::true_
|
|
{
|
|
};
|
|
# else
|
|
template < BOOST_PP_ENUM_PARAMS(BOOST_PYTHON_MAX_BASES, class Base) >
|
|
static char is_bases_helper(bases< BOOST_PYTHON_BASE_PARAMS > const&);
|
|
|
|
static char (& is_bases_helper(...) )[256];
|
|
|
|
template <class T>
|
|
struct specifies_bases
|
|
{
|
|
private:
|
|
static typename add_reference<T>::type make();
|
|
BOOST_STATIC_CONSTANT(bool, non_ref = !is_reference<T>::value);
|
|
public:
|
|
BOOST_STATIC_CONSTANT(bool, value = non_ref & (sizeof(is_bases_helper(make())) == 1));
|
|
typedef mpl::bool_<value> type;
|
|
};
|
|
# endif
|
|
template <class T, class Prev = bases<> >
|
|
struct select_bases
|
|
: mpl::if_<
|
|
specifies_bases<T>
|
|
, T
|
|
, Prev
|
|
>
|
|
{
|
|
};
|
|
}
|
|
# undef BOOST_PYTHON_BASE_PARAMS
|
|
}} // namespace boost::python
|
|
|
|
#endif // BASES_DWA2002321_HPP
|