boost/fusion/sequence/comparison/less_equal.hpp

   1 /*=============================================================================
   2     Copyright (c) 1999-2003 Jaakko Jarvi
   3     Copyright (c) 2001-2006 Joel de Guzman
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(FUSION_LESS_EQUAL_05052005_0432)
   9 #define FUSION_LESS_EQUAL_05052005_0432
  10
  11 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  12 #include <boost/fusion/sequence/intrinsic/end.hpp>
  13 #include <boost/fusion/sequence/intrinsic/size.hpp>
  14 #include <boost/fusion/sequence/comparison/detail/enable_comparison.hpp>
  15
  16 #if defined(FUSION_DIRECT_OPERATOR_USAGE)
  17 #include <boost/fusion/sequence/comparison/detail/less_equal.hpp>
  18 #else
  19 #include <boost/fusion/sequence/comparison/less.hpp>
  20 #endif
  21
  22 namespace boost { namespace fusion
  23 {
  24     template <typename Seq1, typename Seq2>
  25     inline bool
  26     less_equal(Seq1 const& a, Seq2 const& b)
  27     {
  28 #if defined(FUSION_DIRECT_OPERATOR_USAGE)
  29         return detail::sequence_less_equal<Seq1 const, Seq2 const>::
  30             call(fusion::begin(a), fusion::begin(b));
  31 #else
  32         return !(b < a);
  33 #endif
  34     }
  35
  36     namespace operators
  37     {
  38 #if defined(BOOST_MSVC) && (BOOST_MSVC <= 1400)
  39 // Workaround for  VC8.0 and VC7.1
  40         template <typename Seq1, typename Seq2>
  41         inline bool
  42         operator<=(sequence_base<Seq1> const& a, sequence_base<Seq2> const& b)
  43         {
  44             return less_equal(a.derived(), b.derived());
  45         }
  46
  47         template <typename Seq1, typename Seq2>
  48         inline typename disable_if<detail::is_native_fusion_sequence<Seq2>, bool>::type
  49         operator<=(sequence_base<Seq1> const& a, Seq2 const& b)
  50         {
  51             return less_equal(a.derived(), b);
  52         }
  53
  54         template <typename Seq1, typename Seq2>
  55         inline typename disable_if<detail::is_native_fusion_sequence<Seq1>, bool>::type
  56         operator<=(Seq1 const& a, sequence_base<Seq2> const& b)
  57         {
  58             return less_equal(a, b.derived());
  59         }
  60
  61 #else
  62 // Somehow VC8.0 and VC7.1 does not like this code
  63 // but barfs somewhere else.
  64
  65         template <typename Seq1, typename Seq2>
  66         inline typename
  67             enable_if<
  68                 detail::enable_comparison<Seq1, Seq2>
  69               , bool
  70             >::type
  71         operator<=(Seq1 const& a, Seq2 const& b)
  72         {
  73             return fusion::less_equal(a, b);
  74         }
  75 #endif
  76     }
  77     using operators::operator<=;
  78 }}
  79
  80 #endif