1 files changed, 59 insertions, 0 deletions
diff --git a/libstdc++-v3/libsupc++/hash_bytes.h b/libstdc++-v3/libsupc++/hash_bytes.h
new file mode 100644
index 000000000..2f0c0eac6
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+++ b/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