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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2014 Blender Foundation.
* All rights reserved.
*
* Original Author: Brecht van Lommel
* Contributor(s): Lukas Toenne
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/depsgraph/util/depsgraph_util_hash.h
* \ingroup depsgraph
*/
#ifndef __DEPSGRAPH_UTIL_HASH_H__
#define __DEPSGRAPH_UTIL_HASH_H__
#if defined(DEG_NO_UNORDERED_MAP)
# define DEG_HASH_NAMESPACE_BEGIN
# define DEG_HASH_NAMESPACE_END
#endif
#if defined(DEG_TR1_UNORDERED_MAP)
# include <tr1/unordered_map>
# define DEG_HASH_NAMESPACE_BEGIN namespace std { namespace tr1 {
# define DEG_HASH_NAMESPACE_END } }
using std::tr1::hash;
#endif
#if defined(DEG_STD_UNORDERED_MAP)
# include <unordered_map>
# define DEG_HASH_NAMESPACE_BEGIN namespace std {
# define DEG_HASH_NAMESPACE_END }
using std::hash;
#endif
#if defined(DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE)
# include <unordered_map>
# define DEG_HASH_NAMESPACE_BEGIN namespace std { namespace tr1 {
# define DEG_HASH_NAMESPACE_END } }
using std::tr1::hash;
#endif
#if !defined(DEG_NO_UNORDERED_MAP) && !defined(DEG_TR1_UNORDERED_MAP) && \
!defined(DEG_STD_UNORDERED_MAP) && !defined(DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE) // NOLINT
# error One of: DEG_NO_UNORDERED_MAP, DEG_TR1_UNORDERED_MAP,\
DEG_STD_UNORDERED_MAP, DEG_STD_UNORDERED_MAP_IN_TR1_NAMESPACE must be defined! // NOLINT
#endif
/* XXX this might require 2 different variants for sizeof(size_t) (32 vs 64 bit) */
inline size_t hash_combine(size_t hash_a, size_t hash_b)
{
return hash_a ^ (hash_b + 0x9e3779b9 + (hash_a << 6) + (hash_a >> 2));
}
#endif /* __DEPSGRAPH_UTIL_HASH_H__ */
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