1 | |
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2 | #ifndef BOOST_MPL_FOR_EACH_HPP_INCLUDED |
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3 | #define BOOST_MPL_FOR_EACH_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2000-2008 |
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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: for_each.hpp 55648 2009-08-18 05:16:53Z agurtovoy $ |
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14 | // $Date: 2009-08-18 01:16:53 -0400 (Tue, 18 Aug 2009) $ |
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15 | // $Revision: 55648 $ |
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16 | |
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17 | #include <boost/mpl/is_sequence.hpp> |
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18 | #include <boost/mpl/begin_end.hpp> |
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19 | #include <boost/mpl/apply.hpp> |
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20 | #include <boost/mpl/bool.hpp> |
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21 | #include <boost/mpl/next_prior.hpp> |
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22 | #include <boost/mpl/deref.hpp> |
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23 | #include <boost/mpl/identity.hpp> |
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24 | #include <boost/mpl/assert.hpp> |
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25 | #include <boost/mpl/aux_/unwrap.hpp> |
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26 | |
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27 | #include <boost/type_traits/is_same.hpp> |
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28 | #include <boost/utility/value_init.hpp> |
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29 | |
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30 | namespace boost { namespace mpl { |
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31 | |
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32 | namespace aux { |
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33 | |
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34 | template< bool done = true > |
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35 | struct for_each_impl |
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36 | { |
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37 | template< |
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38 | typename Iterator |
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39 | , typename LastIterator |
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40 | , typename TransformFunc |
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41 | , typename F |
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42 | > |
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43 | static void execute( |
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44 | Iterator* |
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45 | , LastIterator* |
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46 | , TransformFunc* |
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47 | , F |
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48 | ) |
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49 | { |
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50 | } |
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51 | }; |
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52 | |
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53 | template<> |
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54 | struct for_each_impl<false> |
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55 | { |
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56 | template< |
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57 | typename Iterator |
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58 | , typename LastIterator |
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59 | , typename TransformFunc |
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60 | , typename F |
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61 | > |
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62 | static void execute( |
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63 | Iterator* |
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64 | , LastIterator* |
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65 | , TransformFunc* |
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66 | , F f |
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67 | ) |
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68 | { |
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69 | typedef typename deref<Iterator>::type item; |
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70 | typedef typename apply1<TransformFunc,item>::type arg; |
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71 | |
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72 | // dwa 2002/9/10 -- make sure not to invoke undefined behavior |
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73 | // when we pass arg. |
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74 | value_initialized<arg> x; |
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75 | aux::unwrap(f, 0)(boost::get(x)); |
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76 | |
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77 | typedef typename mpl::next<Iterator>::type iter; |
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78 | for_each_impl<boost::is_same<iter,LastIterator>::value> |
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79 | ::execute( static_cast<iter*>(0), static_cast<LastIterator*>(0), static_cast<TransformFunc*>(0), f); |
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80 | } |
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81 | }; |
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82 | |
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83 | } // namespace aux |
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84 | |
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85 | // agurt, 17/mar/02: pointer default parameters are necessary to workaround |
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86 | // MSVC 6.5 function template signature's mangling bug |
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87 | template< |
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88 | typename Sequence |
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89 | , typename TransformOp |
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90 | , typename F |
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91 | > |
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92 | inline |
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93 | void for_each(F f, Sequence* = 0, TransformOp* = 0) |
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94 | { |
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95 | BOOST_MPL_ASSERT(( is_sequence<Sequence> )); |
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96 | |
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97 | typedef typename begin<Sequence>::type first; |
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98 | typedef typename end<Sequence>::type last; |
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99 | |
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100 | aux::for_each_impl< boost::is_same<first,last>::value > |
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101 | ::execute(static_cast<first*>(0), static_cast<last*>(0), static_cast<TransformOp*>(0), f); |
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102 | } |
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103 | |
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104 | template< |
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105 | typename Sequence |
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106 | , typename F |
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107 | > |
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108 | inline |
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109 | void for_each(F f, Sequence* = 0) |
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110 | { |
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111 | for_each<Sequence, identity<> >(f); |
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112 | } |
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113 | |
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114 | }} |
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115 | |
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116 | #endif // BOOST_MPL_FOR_EACH_HPP_INCLUDED |
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