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1 | // Boost string_algo library compare.hpp header file -------------------------// |
2 | ||
3 | // Copyright Pavol Droba 2002-2006. | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | // See http://www.boost.org/ for updates, documentation, and revision history. | |
10 | ||
11 | #ifndef BOOST_STRING_COMPARE_HPP | |
12 | #define BOOST_STRING_COMPARE_HPP | |
13 | ||
14 | #include <boost/algorithm/string/config.hpp> | |
15 | #include <locale> | |
16 | ||
17 | /*! \file | |
18 | Defines element comparison predicates. Many algorithms in this library can | |
19 | take an additional argument with a predicate used to compare elements. | |
20 | This makes it possible, for instance, to have case insensitive versions | |
21 | of the algorithms. | |
22 | */ | |
23 | ||
24 | namespace boost { | |
25 | namespace algorithm { | |
26 | ||
27 | // is_equal functor -----------------------------------------------// | |
28 | ||
29 | //! is_equal functor | |
30 | /*! | |
31 | Standard STL equal_to only handle comparison between arguments | |
32 | of the same type. This is a less restrictive version which wraps operator ==. | |
33 | */ | |
34 | struct is_equal | |
35 | { | |
36 | //! Function operator | |
37 | /*! | |
38 | Compare two operands for equality | |
39 | */ | |
40 | template< typename T1, typename T2 > | |
41 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
42 | { | |
43 | return Arg1==Arg2; | |
44 | } | |
45 | }; | |
46 | ||
47 | //! case insensitive version of is_equal | |
48 | /*! | |
49 | Case insensitive comparison predicate. Comparison is done using | |
50 | specified locales. | |
51 | */ | |
52 | struct is_iequal | |
53 | { | |
54 | //! Constructor | |
55 | /*! | |
56 | \param Loc locales used for comparison | |
57 | */ | |
58 | is_iequal( const std::locale& Loc=std::locale() ) : | |
59 | m_Loc( Loc ) {} | |
60 | ||
61 | //! Function operator | |
62 | /*! | |
63 | Compare two operands. Case is ignored. | |
64 | */ | |
65 | template< typename T1, typename T2 > | |
66 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
67 | { | |
68 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) | |
69 | return std::toupper(Arg1)==std::toupper(Arg2); | |
70 | #else | |
71 | return std::toupper<T1>(Arg1,m_Loc)==std::toupper<T2>(Arg2,m_Loc); | |
72 | #endif | |
73 | } | |
74 | ||
75 | private: | |
76 | std::locale m_Loc; | |
77 | }; | |
78 | ||
79 | // is_less functor -----------------------------------------------// | |
80 | ||
81 | //! is_less functor | |
82 | /*! | |
83 | Convenient version of standard std::less. Operation is templated, therefore it is | |
84 | not required to specify the exact types upon the construction | |
85 | */ | |
86 | struct is_less | |
87 | { | |
88 | //! Functor operation | |
89 | /*! | |
90 | Compare two operands using > operator | |
91 | */ | |
92 | template< typename T1, typename T2 > | |
93 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
94 | { | |
95 | return Arg1<Arg2; | |
96 | } | |
97 | }; | |
98 | ||
99 | ||
100 | //! case insensitive version of is_less | |
101 | /*! | |
102 | Case insensitive comparison predicate. Comparison is done using | |
103 | specified locales. | |
104 | */ | |
105 | struct is_iless | |
106 | { | |
107 | //! Constructor | |
108 | /*! | |
109 | \param Loc locales used for comparison | |
110 | */ | |
111 | is_iless( const std::locale& Loc=std::locale() ) : | |
112 | m_Loc( Loc ) {} | |
113 | ||
114 | //! Function operator | |
115 | /*! | |
116 | Compare two operands. Case is ignored. | |
117 | */ | |
118 | template< typename T1, typename T2 > | |
119 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
120 | { | |
121 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) | |
122 | return std::toupper(Arg1)<std::toupper(Arg2); | |
123 | #else | |
124 | return std::toupper<T1>(Arg1,m_Loc)<std::toupper<T2>(Arg2,m_Loc); | |
125 | #endif | |
126 | } | |
127 | ||
128 | private: | |
129 | std::locale m_Loc; | |
130 | }; | |
131 | ||
132 | // is_not_greater functor -----------------------------------------------// | |
133 | ||
134 | //! is_not_greater functor | |
135 | /*! | |
136 | Convenient version of standard std::not_greater_to. Operation is templated, therefore it is | |
137 | not required to specify the exact types upon the construction | |
138 | */ | |
139 | struct is_not_greater | |
140 | { | |
141 | //! Functor operation | |
142 | /*! | |
143 | Compare two operands using > operator | |
144 | */ | |
145 | template< typename T1, typename T2 > | |
146 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
147 | { | |
148 | return Arg1<=Arg2; | |
149 | } | |
150 | }; | |
151 | ||
152 | ||
153 | //! case insensitive version of is_not_greater | |
154 | /*! | |
155 | Case insensitive comparison predicate. Comparison is done using | |
156 | specified locales. | |
157 | */ | |
158 | struct is_not_igreater | |
159 | { | |
160 | //! Constructor | |
161 | /*! | |
162 | \param Loc locales used for comparison | |
163 | */ | |
164 | is_not_igreater( const std::locale& Loc=std::locale() ) : | |
165 | m_Loc( Loc ) {} | |
166 | ||
167 | //! Function operator | |
168 | /*! | |
169 | Compare two operands. Case is ignored. | |
170 | */ | |
171 | template< typename T1, typename T2 > | |
172 | bool operator()( const T1& Arg1, const T2& Arg2 ) const | |
173 | { | |
174 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) | |
175 | return std::toupper(Arg1)<=std::toupper(Arg2); | |
176 | #else | |
177 | return std::toupper<T1>(Arg1,m_Loc)<=std::toupper<T2>(Arg2,m_Loc); | |
178 | #endif | |
179 | } | |
180 | ||
181 | private: | |
182 | std::locale m_Loc; | |
183 | }; | |
184 | ||
185 | ||
186 | } // namespace algorithm | |
187 | ||
188 | // pull names to the boost namespace | |
189 | using algorithm::is_equal; | |
190 | using algorithm::is_iequal; | |
191 | using algorithm::is_less; | |
192 | using algorithm::is_iless; | |
193 | using algorithm::is_not_greater; | |
194 | using algorithm::is_not_igreater; | |
195 | ||
196 | } // namespace boost | |
197 | ||
198 | ||
199 | #endif // BOOST_STRING_COMPARE_HPP |