diff options
Diffstat (limited to 'source/blender/depsgraph/util/depsgraph_util_hash.h')
-rw-r--r-- | source/blender/depsgraph/util/depsgraph_util_hash.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/source/blender/depsgraph/util/depsgraph_util_hash.h b/source/blender/depsgraph/util/depsgraph_util_hash.h new file mode 100644 index 00000000000..0f5a85b3526 --- /dev/null +++ b/source/blender/depsgraph/util/depsgraph_util_hash.h @@ -0,0 +1,66 @@ +/* + * ***** 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 + */ + +#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__ */ |