From 4d092dcbc213452ad5acee98d7cf37fb475a6349 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Wed, 24 Apr 2024 11:31:33 -0400
Subject: [PATCH] xo-unit: + Quantity.scale_by()

---
 include/xo/unit/Quantity.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/xo/unit/Quantity.hpp b/include/xo/unit/Quantity.hpp
index a70fcdee..a401fc9f 100644
--- a/include/xo/unit/Quantity.hpp
+++ b/include/xo/unit/Quantity.hpp
@@ -60,6 +60,12 @@ namespace xo {
                 }
             }
 
+            template <typename Dimensionless>
+            requires std::is_arithmetic_v<Dimensionless>
+            constexpr auto scale_by(Dimensionless x) const {
+                return Quantity(x * this->scale_, this->unit_);
+            }
+
             template <typename Quantity2>
             static constexpr
             auto multiply(const Quantity & x, const Quantity2 & y) {