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1 // Copyright David Abrahams 2002.
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2 // Distributed under the Boost Software License, Version 1.0. (See
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3 // accompanying file LICENSE_1_0.txt or copy at
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4 // http://www.boost.org/LICENSE_1_0.txt)
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5 #ifndef BASES_DWA2002321_HPP
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6 # define BASES_DWA2002321_HPP
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7
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8 # include <boost/python/detail/prefix.hpp>
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9 # include <boost/type_traits/object_traits.hpp>
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10 # include <boost/python/detail/type_list.hpp>
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11 # include <boost/mpl/if.hpp>
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12 # include <boost/mpl/bool.hpp>
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13 # include <boost/preprocessor/enum_params_with_a_default.hpp>
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14 # include <boost/preprocessor/enum_params.hpp>
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15
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16 namespace boost { namespace python {
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17
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18 # define BOOST_PYTHON_BASE_PARAMS BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, Base)
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19
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20 // A type list for specifying bases
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21 template < BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_PYTHON_MAX_BASES, typename Base, mpl::void_) >
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22 struct bases : detail::type_list< BOOST_PYTHON_BASE_PARAMS >::type
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23 {};
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24
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25 namespace detail
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26 {
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27 # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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28 template <class T> struct specifies_bases
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29 : mpl::false_
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30 {
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31 };
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32
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33 template < BOOST_PP_ENUM_PARAMS_Z(1, BOOST_PYTHON_MAX_BASES, class Base) >
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34 struct specifies_bases< bases< BOOST_PYTHON_BASE_PARAMS > >
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35 : mpl::true_
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36 {
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37 };
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38 # else
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39 template < BOOST_PP_ENUM_PARAMS(BOOST_PYTHON_MAX_BASES, class Base) >
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40 static char is_bases_helper(bases< BOOST_PYTHON_BASE_PARAMS > const&);
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41
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42 static char (& is_bases_helper(...) )[256];
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43
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44 template <class T>
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45 struct specifies_bases
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46 {
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47 private:
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48 static typename add_reference<T>::type make();
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49 BOOST_STATIC_CONSTANT(bool, non_ref = !is_reference<T>::value);
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50 public:
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51 BOOST_STATIC_CONSTANT(bool, value = non_ref & (sizeof(is_bases_helper(make())) == 1));
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52 typedef mpl::bool_<value> type;
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53 };
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54 # endif
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55 template <class T, class Prev = bases<> >
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56 struct select_bases
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57 : mpl::if_<
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58 specifies_bases<T>
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59 , T
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60 , Prev
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61 >
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62 {
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63 };
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64 }
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65 # undef BOOST_PYTHON_BASE_PARAMS
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66 }} // namespace boost::python
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67
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68 #endif // BASES_DWA2002321_HPP
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