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/**
* @file llhash.h
* @brief Wrapper for a hash function.
*
* $LicenseInfo:firstyear=2004&license=viewergpl$
*
* Copyright (c) 2004-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#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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