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/**
* @file llstringtable.h
* @brief The LLStringTable class provides a _fast_ method for finding
* unique copies of strings.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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_STATIC_STRING_TABLE_H
#define LL_STATIC_STRING_TABLE_H
#include "lldefs.h"
#include <boost/unordered_map.hpp>
#include "llstl.h"
class LLStaticHashedString
{
public:
LLStaticHashedString(const std::string& s)
{
string_hash = makehash(s);
string = s;
}
const std::string& String() const { return string; }
size_t Hash() const { return string_hash; }
bool operator==(const LLStaticHashedString& b) const { return Hash() == b.Hash(); }
protected:
size_t makehash(const std::string& s)
{
size_t len = s.size();
const char* c = s.c_str();
size_t hashval = 0;
for (size_t i=0; i<len; i++)
{
hashval = ((hashval<<5) + hashval) + *c++;
}
return hashval;
}
std::string string;
size_t string_hash;
};
struct LLStaticStringHasher
{
enum { bucket_size = 8 };
size_t operator()(const LLStaticHashedString& key_value) const { return key_value.Hash(); }
bool operator()(const LLStaticHashedString& left, const LLStaticHashedString& right) const { return left.Hash() < right.Hash(); }
};
template< typename MappedObject >
class LL_COMMON_API LLStaticStringTable
: public boost::unordered_map< LLStaticHashedString, MappedObject, LLStaticStringHasher >
{
};
#endif
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