From 9e42e1faca359cd6acf6e7a3ff951674ca364657 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Fri, 7 Jul 2023 09:36:08 +0200
Subject: [PATCH] feat: `quantity_point` can now be constructed faster from
 another one if they share the same `point_origin`

---
 src/core/include/mp-units/quantity_point.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/core/include/mp-units/quantity_point.h b/src/core/include/mp-units/quantity_point.h
index 7c91f93b..76b92143 100644
--- a/src/core/include/mp-units/quantity_point.h
+++ b/src/core/include/mp-units/quantity_point.h
@@ -112,6 +112,14 @@ public:
   {
   }
 
+  template<auto R2, typename Rep2>
+    requires std::constructible_from<quantity_type, quantity<R2, Rep2>>
+  constexpr explicit(!std::convertible_to<quantity<R2, Rep2>, quantity_type>)
+    quantity_point(const quantity_point<R2, point_origin, Rep2>& qp) :
+      q_(qp.relative())
+  {
+  }
+
   template<QuantityPointOf<absolute_point_origin> QP>
     requires std::constructible_from<quantity_type, typename QP::quantity_type>
   constexpr explicit(!std::convertible_to<typename QP::quantity_type, quantity_type>) quantity_point(const QP& qp) :