90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2008, 2011, 2014, 2015, 2018 Laboratoire de Recherche et
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// Développement de l'Epita (LRDE).
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// Copyright (C) 2003, 2004, 2005 Laboratoire d'Informatique de
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// Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
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// Université Pierre et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <string>
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#include <functional>
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#include <spot/misc/hashfunc.hh>
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#include <unordered_map>
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#include <unordered_set>
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namespace spot
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{
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/// \ingroup hash_funcs
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/// \brief A hash function for pointers.
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template <class T>
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struct ptr_hash :
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public std::unary_function<const T*, size_t>
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{
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// A default constructor is needed if the ptr_hash object is
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// stored in a const member. This occur with the clang version
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// installed by OS X 10.9.
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ptr_hash()
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{
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}
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size_t operator()(const T* p) const noexcept
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{
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return knuth32_hash(reinterpret_cast<const char*>(p)
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- static_cast<const char*>(nullptr));
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}
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};
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/// \ingroup hash_funcs
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/// \brief A hash function for strings.
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typedef std::hash<std::string> string_hash;
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/// \ingroup hash_funcs
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/// \brief A hash function that returns identity
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template<typename T>
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struct identity_hash:
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public std::unary_function<const T&, size_t>
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{
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// A default constructor is needed if the identity_hash object is
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// stored in a const member.
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identity_hash()
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{
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}
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size_t operator()(const T& s) const noexcept
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{
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return s;
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}
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};
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struct pair_hash
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{
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template<typename T, typename U>
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std::size_t operator()(const std::pair<T, U> &p) const noexcept
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{
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std::hash<T> th;
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std::hash<U> uh;
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return wang32_hash(static_cast<size_t>(th(p.first)) ^
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static_cast<size_t>(uh(p.second)));
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}
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};
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}
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