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Diffstat (limited to 'indra/llcommon/llstaticstringtable.h')
-rw-r--r-- | indra/llcommon/llstaticstringtable.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/indra/llcommon/llstaticstringtable.h b/indra/llcommon/llstaticstringtable.h new file mode 100644 index 0000000000..d7e0e8a08d --- /dev/null +++ b/indra/llcommon/llstaticstringtable.h @@ -0,0 +1,82 @@ +/** + * @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 + |