Imported existing code

indra/llcommon/llstrider.h

@@ -0,0 +1,63 @@
+/** 
+ * @file llstrider.h
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, 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_LLSTRIDER_H
+#define LL_LLSTRIDER_H
+
+#include "stdtypes.h"
+
+template <class Object> class LLStrider
+{
+	union
+	{
+		Object* mObjectp;
+		U8*		mBytep;
+	};
+	U32     mSkip;
+public:
+
+	LLStrider()  { mObjectp = NULL; mSkip = sizeof(Object); } 
+	~LLStrider() { } 
+
+	const LLStrider<Object>& operator =  (Object *first)    { mObjectp = first; return *this;}
+	void setStride (S32 skipBytes)	{ mSkip = (skipBytes ? skipBytes : sizeof(Object));}
+
+	void skip(const U32 index)     { mBytep += mSkip*index;}
+
+	Object* get()                  { return mObjectp; }
+	Object* operator->()           { return mObjectp; }
+	Object& operator *()           { return *mObjectp; }
+	Object* operator ++(int)       { Object* old = mObjectp; mBytep += mSkip; return old; }
+	Object* operator +=(int i)     { mBytep += mSkip*i; return mObjectp; }
+	Object& operator[](U32 index)  { return *(Object*)(mBytep + (mSkip * index)); }
+};
+
+#endif // LL_LLSTRIDER_H