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1 /*=============================================================================
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2 Copyright (c) 2001-2011 Joel de Guzman
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3
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4 Distributed under the Boost Software License, Version 1.0. (See accompanying
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5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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6 ==============================================================================*/
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7 #if !defined(FUSION_ADVANCE_09172005_1149)
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8 #define FUSION_ADVANCE_09172005_1149
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9
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10 #include <boost/fusion/support/config.hpp>
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11 #include <boost/mpl/int.hpp>
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12 #include <boost/mpl/if.hpp>
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13 #include <boost/mpl/eval_if.hpp>
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14 #include <boost/mpl/identity.hpp>
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15 #include <boost/fusion/iterator/next.hpp>
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16 #include <boost/fusion/iterator/prior.hpp>
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17
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18 namespace boost { namespace fusion { namespace advance_detail
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19 {
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20 // Default advance implementation, perform next(i)
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21 // or prior(i) N times.
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22
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23 template <typename Iterator, int N>
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24 struct forward;
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25
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26 template <typename Iterator, int N>
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27 struct next_forward
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28 {
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29 typedef typename
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30 forward<
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31 typename result_of::next<Iterator>::type
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32 , N-1
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33 >::type
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34 type;
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35 };
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36
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37 template <typename Iterator, int N>
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38 struct forward
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39 {
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40 typedef typename
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41 mpl::eval_if_c<
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42 (N == 0)
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43 , mpl::identity<Iterator>
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44 , next_forward<Iterator, N>
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45 >::type
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46 type;
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47
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48 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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49 static type const&
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50 call(type const& i)
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51 {
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52 return i;
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53 }
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54
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55 template <typename I>
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56 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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57 static type
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58 call(I const& i)
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59 {
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60 return call(fusion::next(i));
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61 }
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62 };
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63
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64 template <typename Iterator, int N>
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65 struct backward;
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66
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67 template <typename Iterator, int N>
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68 struct next_backward
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69 {
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70 typedef typename
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71 backward<
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72 typename result_of::prior<Iterator>::type
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73 , N+1
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74 >::type
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75 type;
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76 };
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77
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78 template <typename Iterator, int N>
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79 struct backward
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80 {
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81 typedef typename
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82 mpl::eval_if_c<
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83 (N == 0)
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84 , mpl::identity<Iterator>
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85 , next_backward<Iterator, N>
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86 >::type
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87 type;
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88
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89 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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90 static type const&
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91 call(type const& i)
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92 {
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93 return i;
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94 }
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95
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96 template <typename I>
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97 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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98 static type
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99 call(I const& i)
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100 {
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101 return call(fusion::prior(i));
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102 }
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103 };
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104
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105 }}}
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106
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107 #endif
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