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/**
* @file llhash.h
* @brief Wrapper for a hash function.
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLHASH_H
#define LL_LLHASH_H
#include "llpreprocessor.h" // for GCC_VERSION
#if (LL_WINDOWS)
#include <hash_map>
#include <algorithm>
#elif LL_DARWIN || LL_LINUX
# if GCC_VERSION >= 40300 // gcc 4.3 and up
# include <backward/hashtable.h>
# elif GCC_VERSION >= 30400 // gcc 3.4 and up
# include <ext/hashtable.h>
# elif __GNUC__ >= 3
# include <ext/stl_hashtable.h>
# else
# include <hashtable.h>
# endif
#elif LL_SOLARIS
#include <ext/hashtable.h>
#else
#error Please define your platform.
#endif
// Warning - an earlier template-based version of this routine did not do
// the correct thing on Windows. Since this is only used to get
// a string hash, it was converted to a regular routine and
// unit tests added.
inline size_t llhash( const char * value )
{
#if LL_WINDOWS
return stdext::hash_value(value);
#elif ( (defined _STLPORT_VERSION) || ((LL_LINUX) && (__GNUC__ <= 2)) )
std::hash<const char *> H;
return H(value);
#elif LL_DARWIN || LL_LINUX || LL_SOLARIS
__gnu_cxx::hash<const char *> H;
return H(value);
#else
#error Please define your platform.
#endif
}
#endif
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