ceph/src/boost/boost/python/bases.hpp

   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/python/detail/type_list.hpp>
  10 # include <boost/python/detail/type_traits.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