79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/**
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* @file llhash.h
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* @brief Wrapper for a hash function.
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*
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* $LicenseInfo:firstyear=2004&license=viewergpl$
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*
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* Copyright (c) 2004-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLHASH_H
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#define LL_LLHASH_H
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#include "llpreprocessor.h" // for GCC_VERSION
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#if (LL_WINDOWS)
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#include <hash_map>
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#include <algorithm>
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#elif LL_DARWIN || LL_LINUX
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#if GCC_VERSION >= 40300 || LL_ICC || LL_CLANG// gcc 4.3 or icc 11 and up
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# include <backward/hashtable.h>
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#elif GCC_VERSION >= 30400 // gcc 3.4 and up
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# include <ext/hashtable.h>
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#elif __GNUC__ >= 3
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# include <ext/stl_hashtable.h>
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#else
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# include <hashtable.h>
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#endif
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#elif LL_SOLARIS
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#include <ext/hashtable.h>
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#else
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#error Please define your platform.
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#endif
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// Warning - an earlier template-based version of this routine did not do
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// the correct thing on Windows. Since this is only used to get
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// a string hash, it was converted to a regular routine and
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// unit tests added.
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inline size_t llhash( const char * value )
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{
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#if LL_WINDOWS
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return stdext::hash_value(value);
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#elif ( (defined _STLPORT_VERSION) || ((LL_LINUX) && (__GNUC__ <= 2)) )
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std::hash<const char *> H;
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return H(value);
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#elif LL_DARWIN || LL_LINUX || LL_SOLARIS
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__gnu_cxx::hash<const char *> H;
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return H(value);
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#else
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#error Please define your platform.
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#endif
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}
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#endif
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