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author | Jing Yu <jingyu@google.com> | 2011-12-19 16:56:54 -0800 |
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committer | Jing Yu <jingyu@google.com> | 2011-12-19 16:56:54 -0800 |
commit | 40d7cd0fd78fe2004e2a53c4618c148339b02733 (patch) | |
tree | 5874557a6c86a1f564a03e5f28b266e31bc3759c /gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h | |
parent | fe2afdf3f3701489c05d2a7509752d6f0c7616f7 (diff) | |
download | toolchain_gcc-40d7cd0fd78fe2004e2a53c4618c148339b02733.tar.gz toolchain_gcc-40d7cd0fd78fe2004e2a53c4618c148339b02733.tar.bz2 toolchain_gcc-40d7cd0fd78fe2004e2a53c4618c148339b02733.zip |
Add gcc-4.6. Synced to @180989
Change-Id: Ie3676586e1d8e3c8cd9f07d022f450d05fa08439
svn://gcc.gnu.org/svn/gcc/branches/google/gcc-4_6-mobile
Diffstat (limited to 'gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h')
-rw-r--r-- | gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h b/gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h new file mode 100644 index 000000000..2f0c0eac6 --- /dev/null +++ b/gcc-4.6/libstdc++-v3/libsupc++/hash_bytes.h @@ -0,0 +1,59 @@ +// Declarations for hash functions. -*- C++ -*- + +// Copyright (C) 2010, 2011 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option) +// any later version. + +// This library 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. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file bits/hash_bytes.h + * This is an internal header file, included by other library headers. + * Do not attempt to use it directly. @headername{functional} + */ + +#ifndef _HASH_BYTES_H +#define _HASH_BYTES_H 1 + +#pragma GCC system_header + +#include <bits/c++config.h> + +namespace std +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + // Hash function implementation for the nontrivial specialization. + // All of them are based on a primitive that hashes a pointer to a + // byte array. The actual hash algorithm is not guaranteed to stay + // the same from release to release -- it may be updated or tuned to + // improve hash quality or speed. + size_t + _Hash_bytes(const void* __ptr, size_t __len, size_t __seed); + + // A similar hash primitive, using the FNV hash algorithm. This + // algorithm is guaranteed to stay the same from release to release. + // (although it might not produce the same values on different + // machines.) + size_t + _Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed); + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace + +#endif |