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