1 | |
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2 | #ifndef BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED |
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3 | #define BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2003-2004 |
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6 | // Copyright Eric Friedman 2003 |
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7 | // |
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8 | // Distributed under the Boost Software License, Version 1.0. |
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9 | // (See accompanying file LICENSE_1_0.txt or copy at |
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10 | // http://www.boost.org/LICENSE_1_0.txt) |
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11 | // |
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12 | // See http://www.boost.org/libs/mpl for documentation. |
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13 | |
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14 | // $Id: iter_fold_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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15 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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16 | // $Revision: 49267 $ |
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17 | |
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18 | #include <boost/mpl/begin_end.hpp> |
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19 | #include <boost/mpl/logical.hpp> |
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20 | #include <boost/mpl/always.hpp> |
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21 | #include <boost/mpl/eval_if.hpp> |
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22 | #include <boost/mpl/if.hpp> |
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23 | #include <boost/mpl/pair.hpp> |
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24 | #include <boost/mpl/apply.hpp> |
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25 | #include <boost/mpl/aux_/iter_fold_if_impl.hpp> |
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26 | #include <boost/mpl/aux_/na_spec.hpp> |
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27 | #include <boost/mpl/aux_/lambda_support.hpp> |
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28 | #include <boost/mpl/aux_/config/forwarding.hpp> |
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29 | #include <boost/mpl/aux_/config/workaround.hpp> |
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30 | |
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31 | #include <boost/type_traits/is_same.hpp> |
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32 | |
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33 | namespace boost { namespace mpl { |
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34 | |
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35 | namespace aux { |
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36 | |
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37 | template< typename Predicate, typename LastIterator > |
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38 | struct iter_fold_if_pred |
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39 | { |
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40 | template< typename State, typename Iterator > struct apply |
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41 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) |
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42 | : and_< |
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43 | not_< is_same<Iterator,LastIterator> > |
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44 | , apply1<Predicate,Iterator> |
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45 | > |
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46 | { |
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47 | #else |
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48 | { |
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49 | typedef and_< |
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50 | not_< is_same<Iterator,LastIterator> > |
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51 | , apply1<Predicate,Iterator> |
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52 | > type; |
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53 | #endif |
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54 | }; |
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55 | }; |
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56 | |
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57 | } // namespace aux |
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58 | |
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59 | template< |
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60 | typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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61 | , typename BOOST_MPL_AUX_NA_PARAM(State) |
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62 | , typename BOOST_MPL_AUX_NA_PARAM(ForwardOp) |
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63 | , typename BOOST_MPL_AUX_NA_PARAM(ForwardPredicate) |
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64 | , typename BOOST_MPL_AUX_NA_PARAM(BackwardOp) |
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65 | , typename BOOST_MPL_AUX_NA_PARAM(BackwardPredicate) |
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66 | > |
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67 | struct iter_fold_if |
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68 | { |
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69 | |
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70 | typedef typename begin<Sequence>::type first_; |
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71 | typedef typename end<Sequence>::type last_; |
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72 | |
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73 | typedef typename eval_if< |
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74 | is_na<BackwardPredicate> |
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75 | , if_< is_na<BackwardOp>, always<false_>, always<true_> > |
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76 | , identity<BackwardPredicate> |
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77 | >::type backward_pred_; |
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78 | |
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79 | // cwpro8 doesn't like 'cut-off' type here (use typedef instead) |
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80 | #if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) && !BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) |
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81 | struct result_ : |
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82 | #else |
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83 | typedef |
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84 | #endif |
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85 | aux::iter_fold_if_impl< |
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86 | first_ |
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87 | , State |
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88 | , ForwardOp |
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89 | , protect< aux::iter_fold_if_pred< ForwardPredicate,last_ > > |
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90 | , BackwardOp |
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91 | , backward_pred_ |
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92 | > |
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93 | #if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) && !BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) |
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94 | { }; |
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95 | #else |
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96 | result_; |
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97 | #endif |
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98 | |
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99 | public: |
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100 | |
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101 | typedef pair< |
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102 | typename result_::state |
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103 | , typename result_::iterator |
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104 | > type; |
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105 | |
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106 | BOOST_MPL_AUX_LAMBDA_SUPPORT( |
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107 | 6 |
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108 | , iter_fold_if |
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109 | , (Sequence,State,ForwardOp,ForwardPredicate,BackwardOp,BackwardPredicate) |
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110 | ) |
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111 | }; |
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112 | |
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113 | BOOST_MPL_AUX_NA_SPEC(6, iter_fold_if) |
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114 | |
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115 | }} |
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116 | |
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117 | #endif // BOOST_MPL_ITER_FOLD_IF_HPP_INCLUDED |
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