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1 | |
2 | // Copyright 2006-2009 Daniel James. | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | // This file implements a locale aware case insenstive equality predicate and | |
7 | // hash function. Unfortunately it still falls short of full | |
8 | // internationalization as it only deals with a single character at a time | |
9 | // (some languages have tricky cases where the characters in an upper case | |
10 | // string don't have a one-to-one correspondence with the lower case version of | |
11 | // the text, eg. ) | |
12 | ||
13 | #if !defined(BOOST_HASH_EXAMPLES_CASE_INSENSITIVE_HEADER) | |
14 | #define BOOST_HASH_EXAMPLES_CASE_INSENSITIVE_HEADER | |
15 | ||
16 | #include <boost/algorithm/string/predicate.hpp> | |
17 | #include <boost/functional/hash.hpp> | |
18 | ||
19 | namespace hash_examples | |
20 | { | |
21 | struct iequal_to | |
7c673cae FG |
22 | { |
23 | iequal_to() {} | |
24 | explicit iequal_to(std::locale const& l) : locale_(l) {} | |
25 | ||
26 | template <typename String1, typename String2> | |
27 | bool operator()(String1 const& x1, String2 const& x2) const | |
28 | { | |
29 | return boost::algorithm::iequals(x1, x2, locale_); | |
30 | } | |
31 | private: | |
32 | std::locale locale_; | |
33 | }; | |
34 | ||
35 | struct ihash | |
7c673cae FG |
36 | { |
37 | ihash() {} | |
38 | explicit ihash(std::locale const& l) : locale_(l) {} | |
39 | ||
40 | template <typename String> | |
41 | std::size_t operator()(String const& x) const | |
42 | { | |
43 | std::size_t seed = 0; | |
44 | ||
45 | for(typename String::const_iterator it = x.begin(); | |
46 | it != x.end(); ++it) | |
47 | { | |
48 | boost::hash_combine(seed, std::toupper(*it, locale_)); | |
49 | } | |
50 | ||
51 | return seed; | |
52 | } | |
53 | private: | |
54 | std::locale locale_; | |
55 | }; | |
56 | } | |
57 | ||
58 | #endif |