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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 BASES_DWA2002321_HPP # define BASES_DWA2002321_HPP # include <boost/python/detail/prefix.hpp> # include <boost/python/detail/type_list.hpp> # include <boost/python/detail/type_traits.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 { 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_ { }; 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