ceph/src/boost/libs/mpl/include/boost/mpl/aux_/O1_size_impl.hpp

   1
   2 #ifndef BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED
   3 #define BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   6 //
   7 // Distributed under the Boost Software License, Version 1.0.
   8 // (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10 //
  11 // See http://www.boost.org/libs/mpl for documentation.
  12
  13 // $Id$
  14 // $Date$
  15 // $Revision$
  16
  17 #include <boost/mpl/O1_size_fwd.hpp>
  18 #include <boost/mpl/long.hpp>
  19 #include <boost/mpl/if.hpp>
  20 #include <boost/mpl/aux_/has_size.hpp>
  21 #include <boost/mpl/aux_/config/forwarding.hpp>
  22 #include <boost/mpl/aux_/config/static_constant.hpp>
  23 #include <boost/mpl/aux_/config/msvc.hpp>
  24 #include <boost/mpl/aux_/config/workaround.hpp>
  25
  26 namespace boost { namespace mpl {
  27
  28 // default implementation - returns 'Sequence::size' if sequence has a 'size'
  29 // member, and -1 otherwise; conrete sequences might override it by
  30 // specializing either the 'O1_size_impl' or the primary 'O1_size' template
  31
  32 #   if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \
  33     && !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
  34
  35 namespace aux {
  36 template< typename Sequence > struct O1_size_impl
  37     : Sequence::size
  38 {
  39 };
  40 }
  41
  42 template< typename Tag >
  43 struct O1_size_impl
  44 {
  45     template< typename Sequence > struct apply
  46 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
  47         : if_<
  48               aux::has_size<Sequence>
  49             , aux::O1_size_impl<Sequence>
  50             , long_<-1>
  51             >::type
  52     {
  53 #else
  54     {
  55         typedef typename if_<
  56               aux::has_size<Sequence>
  57             , aux::O1_size_impl<Sequence>
  58             , long_<-1>
  59             >::type type;
  60
  61         BOOST_STATIC_CONSTANT(long, value =
  62               (if_<
  63                   aux::has_size<Sequence>
  64                 , aux::O1_size_impl<Sequence>
  65                 , long_<-1>
  66                 >::type::value)
  67             );
  68 #endif
  69     };
  70 };
  71
  72 #   else // BOOST_MSVC
  73
  74 template< typename Tag >
  75 struct O1_size_impl
  76 {
  77     template< typename Sequence > struct apply
  78         : long_<-1>
  79         {
  80         };
  81 };
  82
  83 #   endif
  84
  85 }}
  86
  87 #endif // BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED