[857] | 1 | // Boost string_algo library sequence_traits.hpp header file ---------------------------//
|
---|
| 2 |
|
---|
| 3 | // Copyright Pavol Droba 2002-2003. Use, modification and
|
---|
| 4 | // distribution is subject to the Boost Software License, Version
|
---|
| 5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
---|
| 6 | // http://www.boost.org/LICENSE_1_0.txt)
|
---|
| 7 |
|
---|
| 8 | // See http://www.boost.org for updates, documentation, and revision history.
|
---|
| 9 |
|
---|
| 10 | #ifndef BOOST_STRING_SEQUENCE_TRAITS_HPP
|
---|
| 11 | #define BOOST_STRING_SEQUENCE_TRAITS_HPP
|
---|
| 12 |
|
---|
| 13 | #include <boost/config.hpp>
|
---|
| 14 | #include <boost/mpl/bool.hpp>
|
---|
| 15 | #include <boost/algorithm/string/yes_no_type.hpp>
|
---|
| 16 |
|
---|
| 17 | /*! \file
|
---|
| 18 | Traits defined in this header are used by various algorithms to achieve
|
---|
| 19 | better performance for specific containers.
|
---|
| 20 | Traits provide fail-safe defaults. If a container supports some of these
|
---|
| 21 | features, it is possible to specialize the specific trait for this container.
|
---|
| 22 | For lacking compilers, it is possible of define an override for a specific tester
|
---|
| 23 | function.
|
---|
| 24 |
|
---|
| 25 | Due to a language restriction, it is not currently possible to define specializations for
|
---|
| 26 | stl containers without including the corresponding header. To decrease the overhead
|
---|
| 27 | needed by this inclusion, user can selectively include a specialization
|
---|
| 28 | header for a specific container. They are located in boost/algorithm/string/stl
|
---|
| 29 | directory. Alternatively she can include boost/algorithm/string/std_collection_traits.hpp
|
---|
| 30 | header which contains specializations for all stl containers.
|
---|
| 31 | */
|
---|
| 32 |
|
---|
| 33 | namespace boost {
|
---|
| 34 | namespace algorithm {
|
---|
| 35 |
|
---|
| 36 | // sequence traits -----------------------------------------------//
|
---|
| 37 |
|
---|
| 38 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 39 |
|
---|
| 40 | //! Native replace tester
|
---|
| 41 | /*!
|
---|
| 42 | Declare an override of this tester function with return
|
---|
| 43 | type boost::string_algo::yes_type for a sequence with this property.
|
---|
| 44 |
|
---|
| 45 | \return yes_type if the container has basic_string like native replace
|
---|
| 46 | method.
|
---|
| 47 | */
|
---|
| 48 | no_type has_native_replace_tester(...);
|
---|
| 49 |
|
---|
| 50 | //! Stable iterators tester
|
---|
| 51 | /*!
|
---|
| 52 | Declare an override of this tester function with return
|
---|
| 53 | type boost::string_algo::yes_type for a sequence with this property.
|
---|
| 54 |
|
---|
| 55 | \return yes_type if the sequence's insert/replace/erase methods do not invalidate
|
---|
| 56 | existing iterators.
|
---|
| 57 | */
|
---|
| 58 | no_type has_stable_iterators_tester(...);
|
---|
| 59 |
|
---|
| 60 | //! const time insert tester
|
---|
| 61 | /*!
|
---|
| 62 | Declare an override of this tester function with return
|
---|
| 63 | type boost::string_algo::yes_type for a sequence with this property.
|
---|
| 64 |
|
---|
| 65 | \return yes_type if the sequence's insert method is working in constant time
|
---|
| 66 | */
|
---|
| 67 | no_type has_const_time_insert_tester(...);
|
---|
| 68 |
|
---|
| 69 | //! const time erase tester
|
---|
| 70 | /*!
|
---|
| 71 | Declare an override of this tester function with return
|
---|
| 72 | type boost::string_algo::yes_type for a sequence with this property.
|
---|
| 73 |
|
---|
| 74 | \return yes_type if the sequence's erase method is working in constant time
|
---|
| 75 | */
|
---|
| 76 | no_type has_const_time_erase_tester(...);
|
---|
| 77 |
|
---|
| 78 | #endif //BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 79 |
|
---|
| 80 | //! Native replace trait
|
---|
| 81 | /*!
|
---|
| 82 | This trait specifies that the sequence has \c std::string like replace method
|
---|
| 83 | */
|
---|
| 84 | template< typename T >
|
---|
| 85 | class has_native_replace
|
---|
| 86 | {
|
---|
| 87 |
|
---|
| 88 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 89 | private:
|
---|
| 90 | static T* t;
|
---|
| 91 | public:
|
---|
| 92 | BOOST_STATIC_CONSTANT(bool, value=(
|
---|
| 93 | sizeof(has_native_replace_tester(t))==sizeof(yes_type) ) );
|
---|
| 94 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 95 | public:
|
---|
| 96 | # if BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 97 | enum { value = false };
|
---|
| 98 | # else
|
---|
| 99 | BOOST_STATIC_CONSTANT(bool, value=false);
|
---|
| 100 | # endif // BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 101 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 102 |
|
---|
| 103 |
|
---|
| 104 | typedef mpl::bool_<has_native_replace<T>::value> type;
|
---|
| 105 | };
|
---|
| 106 |
|
---|
| 107 |
|
---|
| 108 | //! Stable iterators trait
|
---|
| 109 | /*!
|
---|
| 110 | This trait specifies that the sequence has stable iterators. It means
|
---|
| 111 | that operations like insert/erase/replace do not invalidate iterators.
|
---|
| 112 | */
|
---|
| 113 | template< typename T >
|
---|
| 114 | class has_stable_iterators
|
---|
| 115 | {
|
---|
| 116 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 117 | private:
|
---|
| 118 | static T* t;
|
---|
| 119 | public:
|
---|
| 120 | BOOST_STATIC_CONSTANT(bool, value=(
|
---|
| 121 | sizeof(has_stable_iterators_tester(t))==sizeof(yes_type) ) );
|
---|
| 122 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 123 | public:
|
---|
| 124 | # if BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 125 | enum { value = false };
|
---|
| 126 | # else
|
---|
| 127 | BOOST_STATIC_CONSTANT(bool, value=false);
|
---|
| 128 | # endif // BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 129 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 130 |
|
---|
| 131 | typedef mpl::bool_<has_stable_iterators<T>::value> type;
|
---|
| 132 | };
|
---|
| 133 |
|
---|
| 134 |
|
---|
| 135 | //! Const time insert trait
|
---|
| 136 | /*!
|
---|
| 137 | This trait specifies that the sequence's insert method has
|
---|
| 138 | constant time complexity.
|
---|
| 139 | */
|
---|
| 140 | template< typename T >
|
---|
| 141 | class has_const_time_insert
|
---|
| 142 | {
|
---|
| 143 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 144 | private:
|
---|
| 145 | static T* t;
|
---|
| 146 | public:
|
---|
| 147 | BOOST_STATIC_CONSTANT(bool, value=(
|
---|
| 148 | sizeof(has_const_time_insert_tester(t))==sizeof(yes_type) ) );
|
---|
| 149 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 150 | public:
|
---|
| 151 | # if BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 152 | enum { value = false };
|
---|
| 153 | # else
|
---|
| 154 | BOOST_STATIC_CONSTANT(bool, value=false);
|
---|
| 155 | # endif // BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 156 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 157 |
|
---|
| 158 | typedef mpl::bool_<has_const_time_insert<T>::value> type;
|
---|
| 159 | };
|
---|
| 160 |
|
---|
| 161 |
|
---|
| 162 | //! Const time erase trait
|
---|
| 163 | /*!
|
---|
| 164 | This trait specifies that the sequence's erase method has
|
---|
| 165 | constant time complexity.
|
---|
| 166 | */
|
---|
| 167 | template< typename T >
|
---|
| 168 | class has_const_time_erase
|
---|
| 169 | {
|
---|
| 170 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 171 | private:
|
---|
| 172 | static T* t;
|
---|
| 173 | public:
|
---|
| 174 | BOOST_STATIC_CONSTANT(bool, value=(
|
---|
| 175 | sizeof(has_const_time_erase_tester(t))==sizeof(yes_type) ) );
|
---|
| 176 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 177 | public:
|
---|
| 178 | # if BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 179 | enum { value = false };
|
---|
| 180 | # else
|
---|
| 181 | BOOST_STATIC_CONSTANT(bool, value=false);
|
---|
| 182 | # endif // BOOST_WORKAROUND( __IBMCPP__, <= 600 )
|
---|
| 183 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
---|
| 184 |
|
---|
| 185 | typedef mpl::bool_<has_const_time_erase<T>::value> type;
|
---|
| 186 | };
|
---|
| 187 |
|
---|
| 188 | } // namespace algorithm
|
---|
| 189 | } // namespace boost
|
---|
| 190 |
|
---|
| 191 |
|
---|
| 192 | #endif // BOOST_STRING_SEQUENCE_TRAITS_HPP
|
---|