boost/mpl/vector/aux_/back.hpp

   1
   2 #ifndef BOOST_MPL_VECTOR_AUX_BACK_HPP_INCLUDED
   3 #define BOOST_MPL_VECTOR_AUX_BACK_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: back.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  14 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
  15 // $Revision: 49267 $
  16
  17 #include <boost/mpl/back_fwd.hpp>
  18 #include <boost/mpl/next_prior.hpp>
  19 #include <boost/mpl/vector/aux_/at.hpp>
  20 #include <boost/mpl/vector/aux_/tag.hpp>
  21 #include <boost/mpl/aux_/config/typeof.hpp>
  22 #include <boost/mpl/aux_/config/ctps.hpp>
  23
  24 namespace boost { namespace mpl {
  25
  26 #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
  27
  28 template<>
  29 struct back_impl< aux::vector_tag >
  30 {
  31     template< typename Vector > struct apply
  32         : v_at<
  33               Vector
  34             , prior<typename Vector::size>::type::value
  35             >
  36     {
  37     };
  38 };
  39
  40 #else
  41
  42 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  43
  44 template< long n_ >
  45 struct back_impl< aux::vector_tag<n_> >
  46 {
  47     template< typename Vector > struct apply
  48     {
  49         typedef typename Vector::back type;
  50     };
  51 };
  52
  53 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  54
  55 #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
  56
  57 }}
  58
  59 #endif // BOOST_MPL_VECTOR_AUX_BACK_HPP_INCLUDED