Remove ancient trunk folder from svn repository

[synfig.git] / ETL / ETL / _bit_rotate.h

diff --git a/ETL/ETL/_bit_rotate.h b/ETL/ETL/_bit_rotate.h
new file mode 100644 (file)
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+++ b/ETL/ETL/_bit_rotate.h
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+/*! ========================================================================
+** Extended Template Library
+** Bit Rotation Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package 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
+** General Public License for more details.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** These template functions have not yet been throughly tested,
+** and may be inaccurate or just plain wrong. You have been warned.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__BIT_ROTATE_H
+#define __ETL__BIT_ROTATE_H
+
+/* === H E A D E R S ======================================================= */
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+template <typename T> T
+rot_left(const T &val, const int &bits=1)
+{
+       return (T)( ((unsigned)val<<bits)+((unsigned)val>>(sizeof(T)*8-bits)) );
+}
+
+template <typename T> T
+rot_right(const T &val, const int &bits=1)
+{
+       return (T)( ((unsigned)val>>bits)+((unsigned)val<<(sizeof(T)*8-bits)) );
+}
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif
+