1 | |
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2 | #ifndef BOOST_MPL_AUX_TRANSFORM_ITER_HPP_INCLUDED |
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3 | #define BOOST_MPL_AUX_TRANSFORM_ITER_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2000-2004 |
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6 | // |
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7 | // Distributed under the Boost Software License, Version 1.0. |
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8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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9 | // http://www.boost.org/LICENSE_1_0.txt) |
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10 | // |
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11 | // See http://www.boost.org/libs/mpl for documentation. |
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12 | |
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13 | // $Id: transform_iter.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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15 | // $Revision: 49267 $ |
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16 | |
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17 | #include <boost/mpl/apply.hpp> |
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18 | #include <boost/mpl/iterator_tags.hpp> |
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19 | #include <boost/mpl/next.hpp> |
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20 | #include <boost/mpl/deref.hpp> |
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21 | #include <boost/mpl/aux_/lambda_spec.hpp> |
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22 | #include <boost/mpl/aux_/config/ctps.hpp> |
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23 | #include <boost/type_traits/is_same.hpp> |
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24 | |
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25 | namespace boost { namespace mpl { |
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26 | |
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27 | namespace aux { |
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28 | |
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29 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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30 | |
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31 | template< |
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32 | typename Iterator |
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33 | , typename LastIterator |
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34 | , typename F |
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35 | > |
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36 | struct transform_iter |
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37 | { |
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38 | typedef Iterator base; |
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39 | typedef forward_iterator_tag category; |
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40 | typedef transform_iter< typename mpl::next<base>::type,LastIterator,F > next; |
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41 | |
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42 | typedef typename apply1< |
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43 | F |
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44 | , typename deref<base>::type |
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45 | >::type type; |
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46 | }; |
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47 | |
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48 | template< |
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49 | typename LastIterator |
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50 | , typename F |
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51 | > |
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52 | struct transform_iter< LastIterator,LastIterator,F > |
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53 | { |
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54 | typedef LastIterator base; |
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55 | typedef forward_iterator_tag category; |
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56 | }; |
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57 | |
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58 | #else |
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59 | |
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60 | template< |
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61 | typename Iterator |
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62 | , typename LastIterator |
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63 | , typename F |
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64 | > |
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65 | struct transform_iter; |
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66 | |
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67 | template< bool > |
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68 | struct transform_iter_impl |
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69 | { |
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70 | template< |
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71 | typename Iterator |
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72 | , typename LastIterator |
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73 | , typename F |
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74 | > |
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75 | struct result_ |
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76 | { |
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77 | typedef Iterator base; |
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78 | typedef forward_iterator_tag category; |
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79 | typedef transform_iter< typename mpl::next<Iterator>::type,LastIterator,F > next; |
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80 | |
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81 | typedef typename apply1< |
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82 | F |
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83 | , typename deref<Iterator>::type |
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84 | >::type type; |
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85 | }; |
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86 | }; |
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87 | |
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88 | template<> |
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89 | struct transform_iter_impl<true> |
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90 | { |
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91 | template< |
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92 | typename Iterator |
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93 | , typename LastIterator |
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94 | , typename F |
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95 | > |
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96 | struct result_ |
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97 | { |
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98 | typedef Iterator base; |
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99 | typedef forward_iterator_tag category; |
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100 | }; |
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101 | }; |
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102 | |
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103 | template< |
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104 | typename Iterator |
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105 | , typename LastIterator |
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106 | , typename F |
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107 | > |
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108 | struct transform_iter |
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109 | : transform_iter_impl< |
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110 | ::boost::is_same<Iterator,LastIterator>::value |
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111 | >::template result_< Iterator,LastIterator,F > |
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112 | { |
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113 | }; |
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114 | |
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115 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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116 | |
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117 | } // namespace aux |
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118 | |
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119 | BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, aux::transform_iter) |
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120 | |
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121 | }} |
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122 | |
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123 | #endif // BOOST_MPL_AUX_TRANSFORM_ITER_HPP_INCLUDED |
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