1// Copyright David Abrahams 2002.
2// Distributed under the Boost Software License, Version 1.0. (See
3// accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5#ifndef BASES_DWA2002321_HPP
6# define BASES_DWA2002321_HPP
7
8# include <boost/python/detail/prefix.hpp>
9# include <boost/type_traits/object_traits.hpp>
10# include <boost/python/detail/type_list.hpp>
11# include <boost/mpl/if.hpp>
12# include <boost/mpl/bool.hpp>
13# include <boost/preprocessor/enum_params_with_a_default.hpp>
14# include <boost/preprocessor/enum_params.hpp>
15
16namespace boost { namespace python {
17
18# define BOOST_PYTHON_BASE_PARAMS BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, Base)
19
20 // A type list for specifying bases
21 template < BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_PYTHON_MAX_BASES, typename Base, mpl::void_) >
22 struct bases : detail::type_list< BOOST_PYTHON_BASE_PARAMS >::type
23 {};
24
25 namespace detail
26 {
27 template <class T> struct specifies_bases
28 : mpl::false_
29 {
30 };
31
32 template < BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, class Base) >
33 struct specifies_bases< bases< BOOST_PYTHON_BASE_PARAMS > >
34 : mpl::true_
35 {
36 };
37 template <class T, class Prev = bases<> >
38 struct select_bases
39 : mpl::if_<
40 specifies_bases<T>
41 , T
42 , Prev
43 >
44 {
45 };
46 }
47# undef BOOST_PYTHON_BASE_PARAMS
48}} // namespace boost::python
49
50#endif // BASES_DWA2002321_HPP
51

source code of boost/boost/python/bases.hpp