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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@40232 a592a061-630c-0410-9148-cb99ea01b6c8
74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
// -*- C++ -*-
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/**
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* \file methash.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Peter Kümmel
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*
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* Full author contact details are available in file CREDITS.
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*
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* Code by Tor Brede Vekterli
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* http://arcticinteractive.com/2009/04/18/compile-time-string-hashing-boost-mpl/
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* (Boost 1.0 license.)
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*
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*/
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#ifndef LYX_META_HASH_H
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#define LYX_META_HASH_H
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#include <boost/mpl/string.hpp>
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#include <boost/mpl/fold.hpp>
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#include <boost/mpl/size_t.hpp>
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#include <boost/functional/hash.hpp>
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namespace lyx {
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namespace support {
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#ifdef _MSC_VER
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#pragma warning(push)
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// disable addition overflow warning
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#pragma warning(disable:4307)
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#endif
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template <typename Seed, typename Value>
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struct hash_combine
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{
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typedef boost::mpl::size_t<
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Seed::value ^ (static_cast<std::size_t>(Value::value)
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+ 0x9e3779b9 + (Seed::value << 6) + (Seed::value >> 2))
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> type;
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};
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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// Hash any sequence of integral wrapper types
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template <typename Sequence>
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struct hash_sequence
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: boost::mpl::fold<
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Sequence
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, boost::mpl::size_t<0>
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, hash_combine<boost::mpl::_1, boost::mpl::_2>
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>::type
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{};
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// For hashing std::strings et al that don't include the zero-terminator
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template <typename String>
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struct hash_string : hash_sequence<String>
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{};
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// Hash including terminating zero for char arrays
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template <typename String>
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struct hash_cstring
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: hash_combine< hash_sequence<String>, boost::mpl::size_t<0> >::type
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{};
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}
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}
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#endif
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