From ce113b557a67dd70dbcb84c12d2daf99dc58993b Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Tue, 7 May 2024 11:51:50 -0400
Subject: [PATCH] xo-unit: + arithmetic (*,/) for scaled_unit/natural_unit
 pairs

---
 include/xo/unit/scaled_unit.hpp | 44 +++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/include/xo/unit/scaled_unit.hpp b/include/xo/unit/scaled_unit.hpp
index a0d8a6f8..ab9a8a94 100644
--- a/include/xo/unit/scaled_unit.hpp
+++ b/include/xo/unit/scaled_unit.hpp
@@ -153,6 +153,28 @@ namespace xo {
                      rr.outer_scale_sq_ * x_unit.outer_scale_sq_ * y_unit.outer_scale_sq_));
         }
 
+        template <typename Int,
+                  typename Int2x = detail::width2x_t<Int>>
+        inline constexpr scaled_unit<Int>
+        operator* (const scaled_unit<Int> & x_unit,
+                   const natural_unit<Int> & y_unit)
+        {
+            auto y_unit2 = detail::make_unit_rescale_result<Int>(y_unit);
+
+            return x_unit * y_unit2;
+        }
+
+        template <typename Int,
+                  typename Int2x = detail::width2x_t<Int>>
+        inline constexpr scaled_unit<Int>
+        operator* (const natural_unit<Int> & x_unit,
+                   const scaled_unit<Int> & y_unit)
+        {
+            auto x_unit2 = detail::make_unit_rescale_result<Int>(x_unit);
+
+            return x_unit2 * y_unit;
+        }
+
         template <typename Int,
                   typename Int2x = detail::width2x_t<Int>>
         inline constexpr scaled_unit<Int>
@@ -169,6 +191,28 @@ namespace xo {
                       * ratio::ratio<Int2x>(y_unit.outer_scale_factor_)),
                      rr.outer_scale_sq_ * x_unit.outer_scale_sq_ * y_unit.outer_scale_sq_));
         }
+
+        template <typename Int,
+                  typename Int2x = detail::width2x_t<Int>>
+        inline constexpr scaled_unit<Int>
+        operator/ (const scaled_unit<Int> & x_unit,
+                   const natural_unit<Int> & y_unit)
+        {
+            auto y_unit2 = detail::make_unit_rescale_result<Int>(y_unit);
+
+            return x_unit / y_unit2;
+        }
+
+        template <typename Int,
+                  typename Int2x = detail::width2x_t<Int>>
+        inline constexpr scaled_unit<Int>
+        operator/ (const natural_unit<Int> & x_unit,
+                   const scaled_unit<Int> & y_unit)
+        {
+            auto x_unit2 = detail::make_unit_rescale_result<Int>(x_unit);
+
+            return x_unit2 / y_unit;
+        }
     } /*namespace qty*/
 } /*namespace xo*/