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 | |
16 | namespace 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 | |