1 | /*
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2 | *
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3 | * Copyright (c) 2002
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4 | * John Maddock
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5 | *
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6 | * Use, modification and distribution are subject to the
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7 | * Boost Software License, Version 1.0. (See accompanying file
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8 | * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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9 | *
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10 | */
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11 |
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12 | /*
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13 | * LOCATION: see http://www.boost.org for most recent version.
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14 | * FILE regex_match.hpp
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15 | * VERSION see <boost/version.hpp>
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16 | * DESCRIPTION: Iterator traits for selecting an iterator type as
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17 | * an integral constant expression.
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18 | */
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19 |
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20 |
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21 | #ifndef BOOST_REGEX_ITERATOR_CATEGORY_HPP
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22 | #define BOOST_REGEX_ITERATOR_CATEGORY_HPP
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23 |
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24 | #include <iterator>
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25 | #include <boost/type_traits/is_convertible.hpp>
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26 | #include <boost/type_traits/is_pointer.hpp>
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27 |
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28 | namespace boost{
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29 | namespace detail{
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30 |
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31 | template <class I>
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32 | struct is_random_imp
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33 | {
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34 | private:
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35 | typedef typename std::iterator_traits<I>::iterator_category cat;
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36 | public:
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37 | BOOST_STATIC_CONSTANT(bool, value = (::boost::is_convertible<cat*, std::random_access_iterator_tag*>::value));
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38 | };
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39 |
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40 | template <class I>
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41 | struct is_random_pointer_imp
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42 | {
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43 | BOOST_STATIC_CONSTANT(bool, value = true);
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44 | };
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45 |
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46 | template <bool is_pointer_type>
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47 | struct is_random_imp_selector
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48 | {
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49 | template <class I>
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50 | struct rebind
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51 | {
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52 | typedef is_random_imp<I> type;
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53 | };
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54 | };
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55 |
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56 | template <>
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57 | struct is_random_imp_selector<true>
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58 | {
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59 | template <class I>
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60 | struct rebind
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61 | {
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62 | typedef is_random_pointer_imp<I> type;
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63 | };
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64 | };
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65 |
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66 | }
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67 |
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68 | template <class I>
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69 | struct is_random_access_iterator
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70 | {
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71 | private:
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72 | typedef detail::is_random_imp_selector< ::boost::is_pointer<I>::value> selector;
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73 | typedef typename selector::template rebind<I> bound_type;
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74 | typedef typename bound_type::type answer;
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75 | public:
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76 | BOOST_STATIC_CONSTANT(bool, value = answer::value);
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77 | };
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78 |
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79 | #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
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80 | template <class I>
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81 | const bool is_random_access_iterator<I>::value;
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82 | #endif
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83 |
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84 | }
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85 |
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86 | #endif
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87 |
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