diff options
| author | Graham Madarasz (Graham) <graham@lindenlab.com> | 2013-03-01 11:23:46 -0800 |
|---|---|---|
| committer | Graham Madarasz (Graham) <graham@lindenlab.com> | 2013-03-01 11:23:46 -0800 |
| commit | 7f66555ed6ce46ac85a10a349e9f40b73c136950 (patch) | |
| tree | c09644f2a0499c0ce729670d496261bd020f64aa | |
| parent | dfda8826eb4654845430520dac48c011e058e1c0 (diff) | |
Add llstaticstringtable.h
| -rw-r--r-- | indra/llcommon/llstaticstringtable.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/indra/llcommon/llstaticstringtable.h b/indra/llcommon/llstaticstringtable.h new file mode 100644 index 0000000000..05b0848e30 --- /dev/null +++ b/indra/llcommon/llstaticstringtable.h @@ -0,0 +1,81 @@ +/**
+ * @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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