From 014458864c04dae31002f4e35331793cc6a51368 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Thu, 13 Feb 2025 19:48:13 +0100
Subject: [PATCH] fix: `std::numeric_limits` usage fixed

---
 src/core/include/mp-units/framework/customization_points.h | 4 ++--
 src/core/include/mp-units/framework/quantity.h             | 2 +-
 src/core/include/mp-units/framework/quantity_point.h       | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/core/include/mp-units/framework/customization_points.h b/src/core/include/mp-units/framework/customization_points.h
index 34c3103a..2d7d09df 100644
--- a/src/core/include/mp-units/framework/customization_points.h
+++ b/src/core/include/mp-units/framework/customization_points.h
@@ -97,7 +97,7 @@ struct representation_values {
   }
 
   static constexpr Rep min() noexcept
-    requires requires {
+    requires std::numeric_limits<Rep>::is_specialized && requires {
       { std::numeric_limits<Rep>::lowest() } -> std::same_as<Rep>;
     }
   {
@@ -105,7 +105,7 @@ struct representation_values {
   }
 
   static constexpr Rep max() noexcept
-    requires requires {
+    requires std::numeric_limits<Rep>::is_specialized && requires {
       { std::numeric_limits<Rep>::max() } -> std::same_as<Rep>;
     }
   {
diff --git a/src/core/include/mp-units/framework/quantity.h b/src/core/include/mp-units/framework/quantity.h
index 60be8839..792ab6e5 100644
--- a/src/core/include/mp-units/framework/quantity.h
+++ b/src/core/include/mp-units/framework/quantity.h
@@ -696,7 +696,7 @@ template<mp_units::Quantity Q, mp_units::RepresentationOf<Q::quantity_spec> Valu
 struct std::common_type<Value, Q> : std::common_type<Q, Value> {};
 
 template<auto R, typename Rep>
-  requires requires { typename std::numeric_limits<Rep>; }
+  requires std::numeric_limits<Rep>::is_specialized
 class std::numeric_limits<mp_units::quantity<R, Rep>> : public std::numeric_limits<Rep> {
 public:
   static constexpr mp_units::quantity<R, Rep> min() noexcept
diff --git a/src/core/include/mp-units/framework/quantity_point.h b/src/core/include/mp-units/framework/quantity_point.h
index a123d032..bd39a8cd 100644
--- a/src/core/include/mp-units/framework/quantity_point.h
+++ b/src/core/include/mp-units/framework/quantity_point.h
@@ -564,7 +564,7 @@ explicit(quantity_point_like_traits<QP>::explicit_import) quantity_point(QP)
 }  // namespace mp_units
 
 template<auto R, auto PO, typename Rep>
-  requires requires { typename std::numeric_limits<Rep>; }
+  requires std::numeric_limits<Rep>::is_specialized
 class std::numeric_limits<mp_units::quantity_point<R, PO, Rep>> : public std::numeric_limits<Rep> {
 public:
   static constexpr mp_units::quantity_point<R, PO, Rep> min() noexcept