[857] | 1 | // Boost string_algo library collection_traits.hpp header file -----------------------//
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| 2 |
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| 3 | // Copyright Pavol Droba 2002-2003. Use, modification and
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| 4 | // distribution is subject to the Boost Software License, Version
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| 5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 6 | // http://www.boost.org/LICENSE_1_0.txt)
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| 7 |
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| 8 | // See http://www.boost.org for updates, documentation, and revision history.
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| 9 |
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| 10 | #ifndef BOOST_RANGE_STRING_DETAIL_COLLECTION_TRAITS_HPP
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| 11 | #define BOOST_RANGE_STRING_DETAIL_COLLECTION_TRAITS_HPP
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| 12 |
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| 13 | #include <boost/algorithm/string/config.hpp>
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| 14 | #include <cstddef>
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| 15 | #include <string>
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| 16 | #include <boost/type_traits/is_array.hpp>
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| 17 | #include <boost/type_traits/is_pointer.hpp>
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| 18 | #include <boost/type_traits/is_const.hpp>
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| 19 | #include <boost/type_traits/is_convertible.hpp>
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| 20 | #include <boost/type_traits/remove_pointer.hpp>
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| 21 | #include <boost/type_traits/remove_cv.hpp>
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| 22 | #include <boost/mpl/eval_if.hpp>
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| 23 | #include <boost/mpl/identity.hpp>
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| 24 | #include <boost/mpl/vector.hpp>
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| 25 | #include <boost/mpl/fold.hpp>
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| 26 | #include <boost/detail/iterator.hpp>
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| 27 | #include <boost/algorithm/string/yes_no_type.hpp>
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| 28 |
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| 29 | // Container traits implementation ---------------------------------------------------------
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| 30 |
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| 31 | namespace boost {
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| 32 | namespace algorithm {
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| 33 | namespace detail {
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| 34 |
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| 35 | // Default collection traits -----------------------------------------------------------------
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| 36 |
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| 37 | // Default collection helper
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| 38 | /*
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| 39 | Wraps std::container compliant containers
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| 40 | */
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| 41 | template< typename ContainerT >
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| 42 | struct default_container_traits
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| 43 | {
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| 44 | typedef BOOST_STRING_TYPENAME ContainerT::value_type value_type;
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| 45 | typedef BOOST_STRING_TYPENAME ContainerT::iterator iterator;
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| 46 | typedef BOOST_STRING_TYPENAME ContainerT::const_iterator const_iterator;
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| 47 | typedef BOOST_STRING_TYPENAME
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| 48 | ::boost::mpl::if_< ::boost::is_const<ContainerT>,
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| 49 | const_iterator,
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| 50 | iterator
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| 51 | >::type result_iterator;
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| 52 | typedef BOOST_STRING_TYPENAME ContainerT::difference_type difference_type;
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| 53 | typedef BOOST_STRING_TYPENAME ContainerT::size_type size_type;
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| 54 |
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| 55 | // static operations
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| 56 | template< typename C >
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| 57 | static size_type size( const C& c )
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| 58 | {
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| 59 | return c.size();
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| 60 | }
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| 61 |
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| 62 | template< typename C >
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| 63 | static bool empty( const C& c )
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| 64 | {
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| 65 | return c.empty();
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| 66 | }
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| 67 |
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| 68 | #ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 69 |
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| 70 | template< typename C >
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| 71 | static iterator begin( C& c )
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| 72 | {
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| 73 | return c.begin();
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| 74 | }
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| 75 |
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| 76 | template< typename C >
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| 77 | static const_iterator begin( const C& c )
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| 78 | {
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| 79 | return c.begin();
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| 80 | }
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| 81 |
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| 82 | template< typename C >
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| 83 | static iterator end( C& c )
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| 84 | {
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| 85 | return c.end();
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| 86 | }
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| 87 |
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| 88 | template< typename C >
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| 89 | static const_iterator end( const C& c )
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| 90 | {
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| 91 | return c.end();
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| 92 | }
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| 93 |
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| 94 | #else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 95 |
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| 96 | template< typename C >
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| 97 | static result_iterator begin( C& c )
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| 98 | {
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| 99 | return c.begin();
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| 100 | }
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| 101 |
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| 102 | template< typename C >
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| 103 | static result_iterator end( C& c )
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| 104 | {
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| 105 | return c.end();
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| 106 | }
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| 107 |
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| 108 | #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 109 |
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| 110 | };
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| 111 |
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| 112 | template<typename T>
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| 113 | struct default_container_traits_selector
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| 114 | {
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| 115 | typedef default_container_traits<T> type;
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| 116 | };
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| 117 |
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| 118 | // Pair container traits ---------------------------------------------------------------------
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| 119 |
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| 120 | // pair selector
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| 121 | template< typename T, typename U >
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| 122 | yes_type is_pair_impl( const std::pair<T,U>* );
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| 123 | no_type is_pair_impl( ... );
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| 124 |
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| 125 | template<typename T> struct is_pair
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| 126 | {
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| 127 | private:
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| 128 | static T* t;
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| 129 | public:
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| 130 | BOOST_STATIC_CONSTANT( bool, value=
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| 131 | sizeof(is_pair_impl(t))==sizeof(yes_type) );
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| 132 | };
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| 133 |
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| 134 | // pair helper
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| 135 | template< typename PairT >
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| 136 | struct pair_container_traits
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| 137 | {
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| 138 | typedef BOOST_STRING_TYPENAME PairT::first_type element_type;
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| 139 |
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| 140 | typedef BOOST_STRING_TYPENAME ::boost::detail::
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| 141 | iterator_traits<element_type>::value_type value_type;
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| 142 | typedef std::size_t size_type;
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| 143 | typedef BOOST_STRING_TYPENAME ::boost::detail::
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| 144 | iterator_traits<element_type>::difference_type difference_type;
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| 145 |
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| 146 | typedef element_type iterator;
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| 147 | typedef element_type const_iterator;
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| 148 | typedef element_type result_iterator;
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| 149 |
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| 150 | // static operations
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| 151 | template< typename P >
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| 152 | static size_type size( const P& p )
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| 153 | {
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| 154 | difference_type diff = std::distance( p.first, p.second );
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| 155 | if ( diff < 0 )
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| 156 | return 0;
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| 157 | else
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| 158 | return diff;
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| 159 | }
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| 160 |
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| 161 | template< typename P >
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| 162 | static bool empty( const P& p )
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| 163 | {
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| 164 | return p.first==p.second;
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| 165 | }
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| 166 |
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| 167 | template< typename P >
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| 168 | static const_iterator begin( const P& p )
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| 169 | {
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| 170 | return p.first;
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| 171 | }
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| 172 |
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| 173 | template< typename P >
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| 174 | static const_iterator end( const P& p )
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| 175 | {
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| 176 | return p.second;
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| 177 | }
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| 178 | }; // 'pair_container_helper'
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| 179 |
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| 180 | template<typename T>
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| 181 | struct pair_container_traits_selector
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| 182 | {
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| 183 | typedef pair_container_traits<T> type;
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| 184 | };
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| 185 |
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| 186 | // Array container traits ---------------------------------------------------------------
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| 187 |
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| 188 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 189 | // array traits ( partial specialization )
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| 190 | template< typename T >
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| 191 | struct array_traits;
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| 192 |
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| 193 | template< typename T, std::size_t sz >
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| 194 | struct array_traits<T[sz]>
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| 195 | {
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| 196 | // typedef
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| 197 | typedef T* iterator;
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| 198 | typedef const T* const_iterator;
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| 199 | typedef T value_type;
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| 200 | typedef std::size_t size_type;
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| 201 | typedef std::ptrdiff_t difference_type;
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| 202 |
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| 203 | // size of the array ( static );
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| 204 | BOOST_STATIC_CONSTANT( size_type, array_size = sz );
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| 205 | };
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| 206 |
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| 207 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 208 |
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| 209 | // array traits ( no partial specialization )
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| 210 | /*
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| 211 | without parial specialization we are able to
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| 212 | provide support only for a limited number of
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| 213 | types. Currently the primitive numeric types
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| 214 | are supported
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| 215 | */
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| 216 | template< typename T, typename BaseT >
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| 217 | struct array_traits_impl
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| 218 | {
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| 219 | typedef BaseT value_type;
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| 220 | typedef BaseT* iterator;
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| 221 | typedef const BaseT* const_iterator;
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| 222 | typedef std::size_t size_type;
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| 223 | typedef std::ptrdiff_t difference_type;
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| 224 |
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| 225 | // size of the array
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| 226 | BOOST_STATIC_CONSTANT( size_type, array_size = sizeof(T)/sizeof(BaseT) );
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| 227 | };
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| 228 |
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| 229 | template< typename T, typename BaseT >
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| 230 | struct array_traits_impl_selector
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| 231 | {
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| 232 | typedef array_traits_impl<T,BaseT> type;
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| 233 | };
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| 234 |
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| 235 | struct array_traits_void
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| 236 | {
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| 237 | typedef void type;
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| 238 | };
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| 239 |
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| 240 | template< typename T, typename BaseT >
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| 241 | struct array_traits_cv_selector
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| 242 | {
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| 243 | typedef BOOST_STRING_TYPENAME
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| 244 | ::boost::mpl::eval_if<
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| 245 | ::boost::is_convertible<T,BaseT*>,
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| 246 | array_traits_impl_selector<T,BaseT>,
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| 247 | ::boost::mpl::eval_if<
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| 248 | ::boost::is_convertible<T,const BaseT*>,
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| 249 | array_traits_impl_selector<T, const BaseT>,
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| 250 | ::boost::mpl::eval_if<
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| 251 | ::boost::is_convertible<T, volatile BaseT*>,
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| 252 | array_traits_impl_selector<T, volatile BaseT>,
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| 253 | array_traits_impl_selector<T, const volatile BaseT>
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| 254 | >
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| 255 | >
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| 256 | >::type type;
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| 257 | };
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| 258 |
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| 259 | template< typename T >
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| 260 | struct array_traits_select
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| 261 | {
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| 262 | template< typename T1, typename T2 >
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| 263 | struct apply
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| 264 | {
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| 265 | typedef BOOST_STRING_TYPENAME
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| 266 | ::boost::mpl::eval_if<
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| 267 | ::boost::is_convertible<T,const volatile T2*>,
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| 268 | array_traits_cv_selector<T,T2>,
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| 269 | ::boost::mpl::identity<T1> >::type type;
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| 270 | };
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| 271 | };
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| 272 |
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| 273 | template< typename T >
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| 274 | struct array_traits_selector
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| 275 | {
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| 276 | private:
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| 277 | // supported array base types
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| 278 | #ifndef BOOST_NO_INTRINSIC_WCHAR_T
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| 279 | typedef BOOST_STRING_TYPENAME
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| 280 | ::boost::mpl::vector10<
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| 281 | wchar_t,
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| 282 | #else // BOOST_NO_INTRINSIC_WCHAR_T
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| 283 | typedef BOOST_STRING_TYPENAME
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| 284 | ::boost::mpl::vector9<
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| 285 | #endif // BOOST_NO_INTRINSIC_WCHAR_T
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| 286 | char,
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| 287 | signed char,
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| 288 | unsigned char,
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| 289 | signed short,
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| 290 | unsigned short,
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| 291 | signed int,
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| 292 | unsigned int,
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| 293 | signed long,
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| 294 | unsigned long
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| 295 | >::type array_base_types;
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| 296 |
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| 297 | public:
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| 298 | typedef BOOST_STRING_TYPENAME
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| 299 | ::boost::mpl::fold<
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| 300 | array_base_types,
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| 301 | ::boost::algorithm::detail::array_traits_void,
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| 302 | ::boost::algorithm::detail::array_traits_select<T> >::type type;
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| 303 | };
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| 304 |
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| 305 | template< typename T >
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| 306 | struct array_traits
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| 307 | {
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| 308 | typedef BOOST_STRING_TYPENAME
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| 309 | array_traits_selector<T>::type traits_type;
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| 310 |
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| 311 | typedef BOOST_STRING_TYPENAME
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| 312 | traits_type::value_type value_type;
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| 313 | typedef BOOST_STRING_TYPENAME
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| 314 | traits_type::iterator iterator;
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| 315 | typedef BOOST_STRING_TYPENAME
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| 316 | traits_type::const_iterator const_iterator;
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| 317 | typedef BOOST_STRING_TYPENAME
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| 318 | traits_type::size_type size_type;
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| 319 | typedef BOOST_STRING_TYPENAME
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| 320 | traits_type::difference_type difference_type;
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| 321 |
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| 322 | BOOST_STATIC_CONSTANT( size_type, array_size = traits_type::array_size );
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| 323 | };
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| 324 |
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| 325 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 326 |
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| 327 | // array lenght resolving
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| 328 | /*
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| 329 | Lenght of string contained in a static array could
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| 330 | be different from the size of the array.
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| 331 | For string processing we need the lenght without
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| 332 | terminating 0.
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| 333 |
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| 334 | Therefore, the lenght is calulated for char and wchar_t
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| 335 | using char_traits, rather then simply returning
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| 336 | the array size.
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| 337 | */
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| 338 | template< typename T >
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| 339 | struct array_length_selector
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| 340 | {
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| 341 | template< typename TraitsT >
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| 342 | struct array_length
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| 343 | {
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| 344 | typedef BOOST_STRING_TYPENAME
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| 345 | TraitsT::size_type size_type;
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| 346 |
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| 347 | BOOST_STATIC_CONSTANT(
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| 348 | size_type,
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| 349 | array_size=TraitsT::array_size );
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| 350 |
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| 351 | template< typename A >
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| 352 | static size_type length( const A& )
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| 353 | {
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| 354 | return array_size;
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| 355 | }
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| 356 |
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| 357 | template< typename A >
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| 358 | static bool empty( const A& )
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| 359 | {
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| 360 | return array_size==0;
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| 361 | }
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| 362 | };
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| 363 | };
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| 364 |
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| 365 | // specialization for char
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| 366 | template<>
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| 367 | struct array_length_selector<char>
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| 368 | {
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| 369 | template< typename TraitsT >
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| 370 | struct array_length
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| 371 | {
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| 372 | typedef BOOST_STRING_TYPENAME
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| 373 | TraitsT::size_type size_type;
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| 374 |
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| 375 | template< typename A >
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| 376 | static size_type length( const A& a )
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| 377 | {
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| 378 | if ( a==0 )
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| 379 | return 0;
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| 380 | else
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| 381 | return std::char_traits<char>::length(a);
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| 382 | }
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| 383 |
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| 384 | template< typename A >
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| 385 | static bool empty( const A& a )
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| 386 | {
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| 387 | return a==0 || a[0]==0;
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| 388 | }
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| 389 | };
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| 390 | };
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| 391 |
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| 392 | // specialization for wchar_t
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| 393 | template<>
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| 394 | struct array_length_selector<wchar_t>
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| 395 | {
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| 396 | template< typename TraitsT >
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| 397 | struct array_length
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| 398 | {
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| 399 | typedef BOOST_STRING_TYPENAME
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| 400 | TraitsT::size_type size_type;
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| 401 |
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| 402 | template< typename A >
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| 403 | static size_type length( const A& a )
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| 404 | {
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| 405 | if ( a==0 )
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| 406 | return 0;
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| 407 | else
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| 408 | return std::char_traits<wchar_t>::length(a);
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| 409 | }
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| 410 |
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| 411 | template< typename A >
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| 412 | static bool empty( const A& a )
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| 413 | {
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| 414 | return a==0 || a[0]==0;
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| 415 | }
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| 416 | };
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| 417 | };
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| 418 |
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| 419 | template< typename T >
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| 420 | struct array_container_traits
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| 421 | {
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| 422 | private:
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| 423 | // resolve array traits
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| 424 | typedef array_traits<T> traits_type;
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| 425 |
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| 426 | public:
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| 427 | typedef BOOST_STRING_TYPENAME
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| 428 | traits_type::value_type value_type;
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| 429 | typedef BOOST_STRING_TYPENAME
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| 430 | traits_type::iterator iterator;
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| 431 | typedef BOOST_STRING_TYPENAME
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| 432 | traits_type::const_iterator const_iterator;
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| 433 | typedef BOOST_STRING_TYPENAME
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| 434 | traits_type::size_type size_type;
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| 435 | typedef BOOST_STRING_TYPENAME
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| 436 | traits_type::difference_type difference_type;
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| 437 |
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| 438 | typedef BOOST_STRING_TYPENAME
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| 439 | ::boost::mpl::if_< ::boost::is_const<T>,
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| 440 | const_iterator,
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| 441 | iterator
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| 442 | >::type result_iterator;
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| 443 |
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| 444 | private:
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| 445 | // resolve array size
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| 446 | typedef BOOST_STRING_TYPENAME
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| 447 | ::boost::remove_cv<value_type>::type char_type;
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| 448 | typedef BOOST_STRING_TYPENAME
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| 449 | array_length_selector<char_type>::
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| 450 | BOOST_NESTED_TEMPLATE array_length<traits_type> array_length_type;
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| 451 |
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| 452 | public:
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| 453 | BOOST_STATIC_CONSTANT( size_type, array_size = traits_type::array_size );
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| 454 |
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| 455 | // static operations
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| 456 | template< typename A >
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| 457 | static size_type size( const A& a )
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| 458 | {
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| 459 | return array_length_type::length(a);
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| 460 | }
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| 461 |
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| 462 | template< typename A >
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| 463 | static bool empty( const A& a )
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| 464 | {
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| 465 | return array_length_type::empty(a);
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| 466 | }
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| 467 |
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| 468 |
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| 469 | #ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 470 |
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| 471 | template< typename A >
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| 472 | static iterator begin( A& a )
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| 473 | {
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| 474 | return a;
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| 475 | }
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| 476 |
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| 477 | template< typename A >
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| 478 | static const_iterator begin( const A& a )
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| 479 | {
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| 480 | return a;
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| 481 | }
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| 482 |
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| 483 | template< typename A >
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| 484 | static iterator end( A& a )
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| 485 | {
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| 486 | return a+array_length_type::length(a);
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| 487 | }
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| 488 |
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| 489 | template< typename A >
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| 490 | static const_iterator end( const A& a )
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| 491 | {
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| 492 | return a+array_length_type::length(a);
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| 493 | }
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| 494 |
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| 495 | #else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 496 |
|
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| 497 | template< typename A >
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| 498 | static result_iterator begin( A& a )
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| 499 | {
|
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| 500 | return a;
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| 501 | }
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| 502 |
|
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| 503 | template< typename A >
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| 504 | static result_iterator end( A& a )
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| 505 | {
|
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| 506 | return a+array_length_type::length(a);
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| 507 | }
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| 508 |
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| 509 | #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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| 510 |
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| 511 | };
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| 512 |
|
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| 513 | template<typename T>
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| 514 | struct array_container_traits_selector
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| 515 | {
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| 516 | typedef array_container_traits<T> type;
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| 517 | };
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| 518 |
|
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| 519 | // Pointer container traits ---------------------------------------------------------------
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| 520 |
|
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| 521 | template<typename T>
|
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| 522 | struct pointer_container_traits
|
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| 523 | {
|
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| 524 | typedef BOOST_STRING_TYPENAME
|
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| 525 | ::boost::remove_pointer<T>::type value_type;
|
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| 526 |
|
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| 527 | typedef BOOST_STRING_TYPENAME
|
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| 528 | ::boost::remove_cv<value_type>::type char_type;
|
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| 529 | typedef ::std::char_traits<char_type> char_traits;
|
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| 530 |
|
---|
| 531 | typedef value_type* iterator;
|
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| 532 | typedef const value_type* const_iterator;
|
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| 533 | typedef std::ptrdiff_t difference_type;
|
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| 534 | typedef std::size_t size_type;
|
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| 535 |
|
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| 536 | typedef BOOST_STRING_TYPENAME
|
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| 537 | ::boost::mpl::if_< ::boost::is_const<T>,
|
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| 538 | const_iterator,
|
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| 539 | iterator
|
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| 540 | >::type result_iterator;
|
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| 541 |
|
---|
| 542 | // static operations
|
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| 543 | template< typename P >
|
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| 544 | static size_type size( const P& p )
|
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| 545 | {
|
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| 546 | if ( p==0 )
|
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| 547 | return 0;
|
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| 548 | else
|
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| 549 | return char_traits::length(p);
|
---|
| 550 | }
|
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| 551 |
|
---|
| 552 | template< typename P >
|
---|
| 553 | static bool empty( const P& p )
|
---|
| 554 | {
|
---|
| 555 | return p==0 || p[0]==0;
|
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| 556 | }
|
---|
| 557 |
|
---|
| 558 | #ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
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| 559 |
|
---|
| 560 | template< typename P >
|
---|
| 561 | static iterator begin( P& p )
|
---|
| 562 | {
|
---|
| 563 | return p;
|
---|
| 564 | }
|
---|
| 565 |
|
---|
| 566 | template< typename P >
|
---|
| 567 | static const_iterator begin( const P& p )
|
---|
| 568 | {
|
---|
| 569 | return p;
|
---|
| 570 | }
|
---|
| 571 |
|
---|
| 572 | template< typename P >
|
---|
| 573 | static iterator end( P& p )
|
---|
| 574 | {
|
---|
| 575 | if ( p==0 )
|
---|
| 576 | return p;
|
---|
| 577 | else
|
---|
| 578 | return p+char_traits::length(p);
|
---|
| 579 | }
|
---|
| 580 |
|
---|
| 581 | template< typename P >
|
---|
| 582 | static const_iterator end( const P& p )
|
---|
| 583 | {
|
---|
| 584 | if ( p==0 )
|
---|
| 585 | return p;
|
---|
| 586 | else
|
---|
| 587 | return p+char_traits::length(p);
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | #else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
---|
| 591 |
|
---|
| 592 | template< typename P >
|
---|
| 593 | static result_iterator begin( P& p )
|
---|
| 594 | {
|
---|
| 595 | return p;
|
---|
| 596 | }
|
---|
| 597 |
|
---|
| 598 | template< typename P >
|
---|
| 599 | static result_iterator end( P& p )
|
---|
| 600 | {
|
---|
| 601 | if ( p==0 )
|
---|
| 602 | return p;
|
---|
| 603 | else
|
---|
| 604 | return p+char_traits::length(p);
|
---|
| 605 | }
|
---|
| 606 |
|
---|
| 607 | #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
---|
| 608 | };
|
---|
| 609 |
|
---|
| 610 | template<typename T>
|
---|
| 611 | struct pointer_container_traits_selector
|
---|
| 612 | {
|
---|
| 613 | typedef pointer_container_traits<T> type;
|
---|
| 614 | };
|
---|
| 615 |
|
---|
| 616 | } // namespace detail
|
---|
| 617 | } // namespace algorithm
|
---|
| 618 | } // namespace boost
|
---|
| 619 |
|
---|
| 620 |
|
---|
| 621 | #endif // BOOST_STRING_DETAIL_COLLECTION_HPP
|
---|