From 031fa62e36444b9dec40848b0c6997195d6db733 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Mon, 22 Apr 2024 19:22:01 +0200
Subject: [PATCH] refactor: `reference` returns `auto` to improve compilation
 times

---
 src/core/include/mp-units/reference.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/core/include/mp-units/reference.h b/src/core/include/mp-units/reference.h
index 047f13c4..c1fa8b95 100644
--- a/src/core/include/mp-units/reference.h
+++ b/src/core/include/mp-units/reference.h
@@ -112,7 +112,7 @@ struct reference {
     return {};
   }
 
-  [[nodiscard]] friend consteval detail::reference_t<inverse(Q{}), inverse(U{})> inverse(reference) { return {}; }
+  [[nodiscard]] friend consteval auto inverse(reference) { return detail::reference_t<inverse(Q{}), inverse(U{})>{}; }
 
   /**
    * @brief Computes the value of a reference raised to the `Num/Den` power
@@ -125,9 +125,9 @@ struct reference {
    */
   template<std::intmax_t Num, std::intmax_t Den = 1>
     requires detail::non_zero<Den>
-  [[nodiscard]] friend consteval detail::reference_t<pow<Num, Den>(Q{}), pow<Num, Den>(U{})> pow(reference)
+  [[nodiscard]] friend consteval auto pow(reference)
   {
-    return {};
+    return detail::reference_t<pow<Num, Den>(Q{}), pow<Num, Den>(U{})>{};
   }
 
   /**
@@ -137,7 +137,7 @@ struct reference {
    *
    * @return The result of computation
    */
-  [[nodiscard]] friend consteval detail::reference_t<sqrt(Q{}), sqrt(U{})> sqrt(reference) { return {}; }
+  [[nodiscard]] friend consteval auto sqrt(reference) { return detail::reference_t<sqrt(Q{}), sqrt(U{})>{}; }
 
   /**
    * @brief Computes the cubic root of a reference
@@ -146,7 +146,7 @@ struct reference {
    *
    * @return The result of computation
    */
-  [[nodiscard]] friend consteval detail::reference_t<cbrt(Q{}), cbrt(U{})> cbrt(reference) { return {}; }
+  [[nodiscard]] friend consteval auto cbrt(reference) { return detail::reference_t<cbrt(Q{}), cbrt(U{})>{}; }
 
   template<typename Q2, typename U2>
   [[nodiscard]] friend consteval bool convertible(reference, reference<Q2, U2>)