88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2017 CERN
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* Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public 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, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef HASH_EDA_H_
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#define HASH_EDA_H_
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/**
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* @brief Hashing functions for EDA_ITEMs.
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*/
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#include <cstdlib>
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#include <functional>
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class EDA_ITEM;
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///> Enables/disables properties that will be used for calculating the hash.
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///> The properties might be combined using the bitwise 'or' operator.
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enum HASH_FLAGS
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{
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HASH_POS = 0x01,
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///> use coordinates relative to the parent object
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REL_COORD = 0x02,
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HASH_ROT = 0x04,
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HASH_LAYER = 0x08,
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HASH_NET = 0x10,
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HASH_REF = 0x20,
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HASH_VALUE = 0x40,
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HASH_ALL = 0xff
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};
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/**
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* Calculates hash of an EDA_ITEM.
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* @param aItem is the item for which the hash will be computed.
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* @return Hash value.
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*/
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std::size_t hash_eda( const EDA_ITEM* aItem, int aFlags = HASH_FLAGS::HASH_ALL );
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/**
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* This is a dummy function to take the final case of hash_combine below
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* @param seed
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*/
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static inline void hash_combine( std::size_t &seed ) {}
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/**
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* @brief Combine multiple hashes utilizing previous hash result
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* @tparam T A hashable type
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* @param seed A seed value input and output for the result.
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* @param val A hashable object of type T
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*/
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template< typename T, typename ... Types >
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static inline void hash_combine( std::size_t &seed, const T &val, const Types &... args )
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{
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seed ^= std::hash<T>()( val ) + 0x9e3779b9 + ( seed << 6 ) + ( seed >> 2 );
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hash_combine( seed, args... );
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}
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template <typename... Types>
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static inline std::size_t hash_val( const Types &... args )
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{
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std::size_t seed = 0xa82de1c0;
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hash_combine( seed, args... );
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return seed;
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}
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#endif
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