src/thirdparty/boost_1_47_0/boost/multi_index/detail/base_type.hpp

   1 /* Copyright 2003-2008 Joaquin M Lopez Munoz.
   2  * Distributed under the Boost Software License, Version 1.0.
   3  * (See accompanying file LICENSE_1_0.txt or copy at
   4  * http://www.boost.org/LICENSE_1_0.txt)
   5  *
   6  * See http://www.boost.org/libs/multi_index for library home page.
   7  */
   8
   9 #ifndef BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP
  10 #define BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP
  11
  12 #if defined(_MSC_VER)&&(_MSC_VER>=1200)
  13 #pragma once
  14 #endif
  15
  16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
  17 #include <boost/detail/workaround.hpp>
  18 #include <boost/mpl/at.hpp>
  19 #include <boost/mpl/apply.hpp>
  20 #include <boost/mpl/size.hpp>
  21 #include <boost/multi_index/detail/index_base.hpp>
  22 #include <boost/multi_index/detail/is_index_list.hpp>
  23 #include <boost/multi_index/detail/msvc_index_specifier.hpp>
  24 #include <boost/static_assert.hpp>
  25
  26 namespace boost{
  27
  28 namespace multi_index{
  29
  30 namespace detail{
  31
  32 /* MPL machinery to construct a linear hierarchy of indices out of
  33  * a index list.
  34  */
  35
  36 #if BOOST_WORKAROUND(BOOST_MSVC,<1310)
  37 struct index_applier
  38 {
  39   template<typename IndexSpecifierMeta,typename SuperMeta>
  40   struct apply:
  41     msvc_index_specifier<IndexSpecifierMeta::type>::
  42       template result_index_class<SuperMeta>
  43   {
  44   };
  45 };
  46 #else
  47 struct index_applier
  48 {
  49   template<typename IndexSpecifierMeta,typename SuperMeta>
  50   struct apply
  51   {
  52     typedef typename IndexSpecifierMeta::type            index_specifier;
  53     typedef typename index_specifier::
  54       BOOST_NESTED_TEMPLATE index_class<SuperMeta>::type type;
  55   };
  56 };
  57 #endif
  58
  59 template<int N,typename Value,typename IndexSpecifierList,typename Allocator>
  60 struct nth_layer
  61 {
  62   BOOST_STATIC_CONSTANT(int,length=mpl::size<IndexSpecifierList>::value);
  63
  64   typedef typename  mpl::eval_if_c<
  65     N==length,
  66     mpl::identity<index_base<Value,IndexSpecifierList,Allocator> >,
  67     mpl::apply2<
  68       index_applier,
  69       mpl::at_c<IndexSpecifierList,N>,
  70       nth_layer<N+1,Value,IndexSpecifierList,Allocator>
  71     >
  72   >::type type;
  73 };
  74
  75 template<typename Value,typename IndexSpecifierList,typename Allocator>
  76 struct multi_index_base_type:nth_layer<0,Value,IndexSpecifierList,Allocator>
  77 {
  78   BOOST_STATIC_ASSERT(detail::is_index_list<IndexSpecifierList>::value);
  79 };
  80
  81 } /* namespace multi_index::detail */
  82
  83 } /* namespace multi_index */
  84
  85 } /* namespace boost */
  86
  87 #endif