| |
| // Copyright 2006-2009 Daniel James. |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| // This file implements a locale aware case insenstive equality predicate and |
| // hash function. Unfortunately it still falls short of full |
| // internationalization as it only deals with a single character at a time |
| // (some languages have tricky cases where the characters in an upper case |
| // string don't have a one-to-one correspondence with the lower case version of |
| // the text, eg. ) |
| |
| #if !defined(BOOST_HASH_EXAMPLES_CASE_INSENSITIVE_HEADER) |
| #define BOOST_HASH_EXAMPLES_CASE_INSENSITIVE_HEADER |
| |
| #include <boost/algorithm/string/predicate.hpp> |
| #include <boost/functional/hash.hpp> |
| |
| namespace hash_examples |
| { |
| struct iequal_to |
| : std::binary_function<std::string, std::string, bool> |
| { |
| iequal_to() {} |
| explicit iequal_to(std::locale const& l) : locale_(l) {} |
| |
| template <typename String1, typename String2> |
| bool operator()(String1 const& x1, String2 const& x2) const |
| { |
| return boost::algorithm::iequals(x1, x2, locale_); |
| } |
| private: |
| std::locale locale_; |
| }; |
| |
| struct ihash |
| : std::unary_function<std::string, std::size_t> |
| { |
| ihash() {} |
| explicit ihash(std::locale const& l) : locale_(l) {} |
| |
| template <typename String> |
| std::size_t operator()(String const& x) const |
| { |
| std::size_t seed = 0; |
| |
| for(typename String::const_iterator it = x.begin(); |
| it != x.end(); ++it) |
| { |
| boost::hash_combine(seed, std::toupper(*it, locale_)); |
| } |
| |
| return seed; |
| } |
| private: |
| std::locale locale_; |
| }; |
| } |
| |
| #endif |