73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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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, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2014 Blender Foundation.
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* All rights reserved.
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*
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* Original Author: Brecht van Lommel
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* Contributor(s): Lukas Toenne
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/depsgraph/util/depsgraph_util_hash.h
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* \ingroup depsgraph
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*/
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#ifndef __DEPSGRAPH_UTIL_HASH_H__
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#define __DEPSGRAPH_UTIL_HASH_H__
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#if defined(DEG_NO_UNORDERED_MAP)
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# define DEG_HASH_NAMESPACE_BEGIN
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# define DEG_HASH_NAMESPACE_END
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#endif
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#if defined(DEG_TR1_UNORDERED_MAP)
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# include <tr1/unordered_map>
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# define DEG_HASH_NAMESPACE_BEGIN namespace std { namespace tr1 {
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# define DEG_HASH_NAMESPACE_END } }
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using std::tr1::hash;
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#endif
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#if defined(DEG_STD_UNORDERED_MAP)
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# include <unordered_map>
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# define DEG_HASH_NAMESPACE_BEGIN namespace std {
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# define DEG_HASH_NAMESPACE_END }
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using std::hash;
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#endif
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#if defined(DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE)
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# include <unordered_map>
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# define DEG_HASH_NAMESPACE_BEGIN namespace std { namespace tr1 {
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# define DEG_HASH_NAMESPACE_END } }
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using std::tr1::hash;
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#endif
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#if !defined(DEG_NO_UNORDERED_MAP) && !defined(DEG_TR1_UNORDERED_MAP) && \
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!defined(DEG_STD_UNORDERED_MAP) && !defined(DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE) // NOLINT
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# error One of: DEG_NO_UNORDERED_MAP, DEG_TR1_UNORDERED_MAP,\
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DEG_STD_UNORDERED_MAP, DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE must be defined! // NOLINT
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#endif
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/* XXX this might require 2 different variants for sizeof(size_t) (32 vs 64 bit) */
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inline size_t hash_combine(size_t hash_a, size_t hash_b)
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{
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return hash_a ^ (hash_b + 0x9e3779b9 + (hash_a << 6) + (hash_a >> 2));
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}
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#endif /* __DEPSGRAPH_UTIL_HASH_H__ */
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