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diff --git a/src/Moof/cml/et/scalar_ops.h b/src/Moof/cml/et/scalar_ops.h
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+++ b/src/Moof/cml/et/scalar_ops.h
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+/* -*- C++ -*- ------------------------------------------------------------
+ 
+Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
+
+The Configurable Math Library (CML) is distributed under the terms of the
+Boost Software License, v1.0 (see cml/LICENSE for details).
+
+ *-----------------------------------------------------------------------*/
+/** @file
+ *  @brief
+ */
+
+#ifndef ops_h
+#define ops_h
+
+#include <cml/et/traits.h>
+#include <cml/et/scalar_promotions.h>
+
+/** Declare a unary scalar operator, like negation. */
+#define CML_UNARY_SCALAR_OP(_op_, _op_name_)                            \
+template<typename ArgT> struct _op_name_ {                              \
+    typedef ExprTraits<ArgT> arg_traits;                                \
+    typedef typename arg_traits::const_reference arg_reference;         \
+    typedef typename arg_traits::value_type value_type;                 \
+    typedef scalar_result_tag result_tag;                               \
+    value_type apply(arg_reference arg) const { return _op_ arg; }      \
+};
+
+/** Declare a binary scalar operator, like addition, s1+s2. */
+#define CML_BINARY_SCALAR_OP(_op_, _op_name_)                            \
+template<typename LeftT, typename RightT> struct _op_name_ {             \
+    typedef ExprTraits<LeftT> left_traits;                               \
+    typedef ExprTraits<RightT> right_traits;                             \
+    typedef typename left_traits::const_reference left_reference;        \
+    typedef typename right_traits::const_reference right_reference;      \
+    typedef typename left_traits::value_type left_value;                 \
+    typedef typename right_traits::value_type right_value;               \
+    typedef typename ScalarPromote<left_value,right_value>::type value_type; \
+    typedef scalar_result_tag result_tag;                               \
+    value_type apply(left_reference left, right_reference right) const { \
+        return left _op_ right; }                                        \
+};
+
+/** Declare an op-assignment operator.
+ *
+ * @note The ExprTraits for both argument types must be defined, LeftT must
+ * have an assignment operator, and ExprTraits<LeftT>::reference must specify
+ * a type that allows assignment.
+ */
+#define CML_BINARY_SCALAR_OP_ASSIGN(_op_, _op_name_)                     \
+template<typename LeftT, typename RightT> struct _op_name_ {             \
+    typedef ExprTraits<LeftT> left_traits;                               \
+    typedef ExprTraits<RightT> right_traits;                             \
+    typedef typename left_traits::reference left_reference;              \
+    typedef typename right_traits::const_reference right_reference;      \
+    typedef typename left_traits::value_type left_value;                 \
+    typedef typename right_traits::value_type right_value;               \
+    typedef typename ScalarPromote<left_value,right_value>::type value_type; \
+    typedef scalar_result_tag result_tag;                                \
+    value_type apply(left_reference left, right_reference right) const { \
+        return left _op_ (LeftT) right; }                                \
+};
+
+/** Declare a binary boolean operator, like less-than, s1 < s2.
+ *
+ * The operator should return the appropriate truth value for the operator.
+ *
+ * @note Both scalar types must have operator<() defined.
+ */
+#define CML_BOOLEAN_SCALAR_OP(_op_, _op_name_)                           \
+template<typename LeftT, typename RightT> struct _op_name_ {             \
+    typedef ExprTraits<LeftT> left_traits;                               \
+    typedef ExprTraits<RightT> right_traits;                             \
+    typedef typename left_traits::const_reference left_reference;        \
+    typedef typename right_traits::const_reference right_reference;      \
+    typedef scalar_result_tag result_tag;                                \
+    bool apply(left_reference left, right_reference right) const {       \
+        return left _op_ right; }                                        \
+};
+
+namespace cml {
+namespace et {
+
+/* Define the operators: */
+
+/* Unary scalar ops: */
+CML_UNARY_SCALAR_OP(-, OpNeg)
+CML_UNARY_SCALAR_OP(+, OpPos)
+
+/* Binary scalar ops: */
+CML_BINARY_SCALAR_OP(+, OpAdd)
+CML_BINARY_SCALAR_OP(-, OpSub)
+CML_BINARY_SCALAR_OP(*, OpMul)
+
+#if defined(CML_RECIPROCAL_OPTIMIZATION)
+/* XXX Yikes... this should really be written out in full. *= 1./ is the
+ * "_op_" parameter to the macro (see above):
+ */
+CML_BINARY_SCALAR_OP(* value_type(1)/, OpDiv)
+#else
+CML_BINARY_SCALAR_OP(/, OpDiv)
+#endif
+
+/* Binary scalar op-assigns: */
+CML_BINARY_SCALAR_OP_ASSIGN( =, OpAssign)
+CML_BINARY_SCALAR_OP_ASSIGN(+=, OpAddAssign)
+CML_BINARY_SCALAR_OP_ASSIGN(-=, OpSubAssign)
+CML_BINARY_SCALAR_OP_ASSIGN(*=, OpMulAssign)
+
+#if defined(CML_RECIPROCAL_OPTIMIZATION)
+/* XXX Yikes... this should really be written out in full. *= 1./ is the
+ * "_op_" parameter to the macro (see above):
+ */
+CML_BINARY_SCALAR_OP_ASSIGN(*= value_type(1)/, OpDivAssign)
+#else
+CML_BINARY_SCALAR_OP_ASSIGN(/=, OpDivAssign)
+#endif
+
+/* Boolean operators for scalars: */
+CML_BOOLEAN_SCALAR_OP(==, OpEqual)
+CML_BOOLEAN_SCALAR_OP(!=, OpNotEqual)
+CML_BOOLEAN_SCALAR_OP( <, OpLess)
+CML_BOOLEAN_SCALAR_OP( >, OpGreater)
+CML_BOOLEAN_SCALAR_OP(<=, OpLessEqual)
+CML_BOOLEAN_SCALAR_OP(>=, OpGreaterEqual)
+
+#undef CML_UNARY_SCALAR_OP
+#undef CML_BINARY_SCALAR_OP
+#undef CML_BINARY_SCALAR_OP_ASSIGN
+#undef CML_BOOLEAN_SCALAR_OP
+
+} // namespace et
+} // namespace cml
+
+#endif
+
+// -------------------------------------------------------------------------
+// vim:ft=cpp