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Lib/Include/CML/vector/vector_promotions.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
+ *
+ * Defines promotions for vectors used in vector/vector or vector/scalar
+ * expressions.
+ *
+ * @sa BinaryVectorOp
+ */
+
+#ifndef vector_promotions_h
+#define vector_promotions_h
+
+#include <cml/et/scalar_promotions.h>
+#include <cml/et/array_promotions.h>
+
+namespace cml {
+namespace et {
+
+/* Default vector type promotion template. */
+template<class LeftT, class RightT> struct VectorPromote;
+
+/** Type promotion for two vector types. */
+template<typename E1, class AT1, typename E2, class AT2>
+struct VectorPromote< cml::vector<E1,AT1>, cml::vector<E2,AT2> >
+{
+    typedef typename ArrayPromote<
+        typename cml::vector<E1,AT1>::array_type,
+        typename cml::vector<E2,AT2>::array_type
+    >::type promoted_array;
+
+    /* The deduced vector result type: */
+    typedef cml::vector<
+        typename promoted_array::value_type,
+        typename promoted_array::generator_type
+    > type;
+
+    /* The deduced temporary type: */
+    typedef typename type::temporary_type temporary_type;
+};
+
+/** Type promotion for a vector and a scalar. */
+template<typename E, class AT, typename S>
+struct VectorPromote<cml::vector<E,AT>, S>
+{
+    /* The deduced vector result type (the array type is the same): */
+    typedef cml::vector<typename ScalarPromote<E,S>::type, AT> type;
+
+    /* The deduced temporary type: */
+    typedef typename type::temporary_type temporary_type;
+};
+
+/** Type promotion for a scalar and a vector. */
+template<typename S, typename E, class AT>
+struct VectorPromote<S, cml::vector<E,AT> >
+{
+    /* The deduced vector result type (the array type is the same): */
+    typedef cml::vector<typename ScalarPromote<S,E>::type, AT> type;
+
+    /* The deduced temporary type: */
+    typedef typename type::temporary_type temporary_type;
+};
+
+} // namespace et
+} // namespace cml
+
+#endif
+
+// -------------------------------------------------------------------------
+// vim:ft=cpp