From 2dc975fa923cfabcd0ee4459eb608219a72e4e02 Mon Sep 17 00:00:00 2001
From: Jordan Woyak <jordan.woyak@gmail.com>
Date: Mon, 5 May 2025 19:30:53 -0500
Subject: Common: Replace enable_if with concepts and other minor
 modernizations.

---
 Source/Core/Common/Config/ConfigInfo.h | 15 +++------------
 Source/Core/Common/Config/Layer.h      |  5 +++--
 2 files changed, 6 insertions(+), 14 deletions(-)

(limited to 'Source/Core/Common/Config')

diff --git a/Source/Core/Common/Config/ConfigInfo.h b/Source/Core/Common/Config/ConfigInfo.h
index be3d00108b..e8d904fae2 100644
--- a/Source/Core/Common/Config/ConfigInfo.h
+++ b/Source/Core/Common/Config/ConfigInfo.h
@@ -6,21 +6,14 @@
 #include <mutex>
 #include <shared_mutex>
 #include <string>
-#include <type_traits>
 #include <utility>
 
 #include "Common/CommonTypes.h"
 #include "Common/Config/Enums.h"
+#include "Common/TypeUtils.h"
 
 namespace Config
 {
-namespace detail
-{
-// std::underlying_type may only be used with enum types, so make sure T is an enum type first.
-template <typename T>
-using UnderlyingType = typename std::enable_if_t<std::is_enum<T>{}, std::underlying_type<T>>::type;
-}  // namespace detail
-
 struct Location
 {
   System system{};
@@ -54,8 +47,7 @@ public:
 
   // Make it easy to convert Info<Enum> into Info<UnderlyingType<Enum>>
   // so that enum settings can still easily work with code that doesn't care about the enum values.
-  template <typename Enum,
-            std::enable_if_t<std::is_same<T, detail::UnderlyingType<Enum>>::value>* = nullptr>
+  template <Common::TypedEnum<T> Enum>
   Info(const Info<Enum>& other)
   {
     *this = other;
@@ -80,8 +72,7 @@ public:
 
   // Make it easy to convert Info<Enum> into Info<UnderlyingType<Enum>>
   // so that enum settings can still easily work with code that doesn't care about the enum values.
-  template <typename Enum,
-            std::enable_if_t<std::is_same<T, detail::UnderlyingType<Enum>>::value>* = nullptr>
+  template <Common::TypedEnum<T> Enum>
   Info<T>& operator=(const Info<Enum>& other)
   {
     m_location = other.GetLocation();
diff --git a/Source/Core/Common/Config/Layer.h b/Source/Core/Common/Config/Layer.h
index e82b411c29..3234cc0638 100644
--- a/Source/Core/Common/Config/Layer.h
+++ b/Source/Core/Common/Config/Layer.h
@@ -23,7 +23,8 @@ struct DefaultState
 
 namespace detail
 {
-template <typename T, std::enable_if_t<!std::is_enum<T>::value>* = nullptr>
+template <typename T>
+requires(!Common::Enum<T>)
 std::optional<T> TryParse(const std::string& str_value)
 {
   T value;
@@ -32,7 +33,7 @@ std::optional<T> TryParse(const std::string& str_value)
   return value;
 }
 
-template <typename T, std::enable_if_t<std::is_enum<T>::value>* = nullptr>
+template <Common::Enum T>
 std::optional<T> TryParse(const std::string& str_value)
 {
   const auto result = TryParse<std::underlying_type_t<T>>(str_value);
-- 
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