From a2b1fdd4c8c7c6c915ce98cb42217a0df0880f92 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Tue, 16 May 2023 13:44:13 +0200
Subject: [PATCH] feat: unit conversion operator added to `quantity_point`

---
 src/core/include/mp_units/quantity_point.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/core/include/mp_units/quantity_point.h b/src/core/include/mp_units/quantity_point.h
index 96fdf890..c1654020 100644
--- a/src/core/include/mp_units/quantity_point.h
+++ b/src/core/include/mp_units/quantity_point.h
@@ -133,6 +133,13 @@ public:
       return point_origin.absolute() + relative();
   }
 
+  template<Unit U>
+    requires detail::QuantityConvertibleTo<quantity_type, quantity<::mp_units::reference<quantity_spec, U{}>{}, Rep>>
+  [[nodiscard]] constexpr quantity_point<::mp_units::reference<quantity_spec, U{}>{}, PO, Rep> operator[](U) const
+  {
+    return quantity_point<quantity_spec[U{}], PO, Rep>{*this};
+  }
+
   // member unary operators
   constexpr quantity_point& operator++()
     requires requires { ++q_; }