ceph/src/boost/libs/mpl/include/boost/mpl/aux_/order_impl.hpp

   1
   2 #ifndef BOOST_MPL_AUX_ORDER_IMPL_HPP_INCLUDED
   3 #define BOOST_MPL_AUX_ORDER_IMPL_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2003-2004
   6 // Copyright David Abrahams 2003-2004
   7 //
   8 // Distributed under the Boost Software License, Version 1.0.
   9 // (See accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11 //
  12 // See http://www.boost.org/libs/mpl for documentation.
  13
  14 // $Id$
  15 // $Date$
  16 // $Revision$
  17
  18 #include <boost/mpl/order_fwd.hpp>
  19 #include <boost/mpl/if.hpp>
  20 #include <boost/mpl/long.hpp>
  21 #include <boost/mpl/has_key.hpp>
  22 #include <boost/mpl/aux_/overload_names.hpp>
  23 #include <boost/mpl/aux_/static_cast.hpp>
  24 #include <boost/mpl/aux_/type_wrapper.hpp>
  25 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  26 #include <boost/mpl/aux_/config/msvc.hpp>
  27 #include <boost/mpl/aux_/config/static_constant.hpp>
  28 #include <boost/mpl/aux_/config/workaround.hpp>
  29
  30 namespace boost { namespace mpl {
  31
  32 // default implementation; requires 'Seq' to provide corresponding overloads
  33 // of BOOST_MPL_AUX_OVERLOAD_ORDER_BY_KEY
  34
  35 template< typename Seq, typename Key > struct x_order_impl
  36 #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) \
  37     || BOOST_WORKAROUND(__EDG_VERSION__, <= 245)
  38 {
  39     BOOST_STATIC_CONSTANT(long, value =
  40           sizeof( BOOST_MPL_AUX_OVERLOAD_CALL_ORDER_BY_KEY(
  41               Seq
  42             , BOOST_MPL_AUX_STATIC_CAST(aux::type_wrapper<Key>*, 0)
  43             ) )
  44         );
  45
  46     typedef long_<value> type;
  47
  48 #else // ISO98 C++
  49     : long_<
  50           sizeof( BOOST_MPL_AUX_OVERLOAD_CALL_ORDER_BY_KEY(
  51               Seq
  52             , BOOST_MPL_AUX_STATIC_CAST(aux::type_wrapper<Key>*, 0)
  53             ) )
  54         >
  55 {
  56 #endif
  57 };
  58
  59 template< typename Tag >
  60 struct order_impl
  61 {
  62     template< typename Seq, typename Key > struct apply
  63         : if_<
  64               typename has_key_impl<Tag>::template apply<Seq,Key>
  65             , x_order_impl<Seq,Key>
  66             , void_
  67             >::type
  68     {
  69     };
  70 };
  71
  72 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2,order_impl)
  73
  74 }}
  75
  76 #endif // BOOST_MPL_AUX_ORDER_IMPL_HPP_INCLUDED