From 91755d2196702c51f4d9591d5d5c3fa3863e92ab Mon Sep 17 00:00:00 2001
From: _Redstone_c_ <myredstone1024@gmail.com>
Date: Sat, 26 Mar 2022 19:33:28 +0800
Subject: [PATCH] feat(templates): add TUnwrapReference and the corresponding
 testing

---
 Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp | 3 +++
 Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h  | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp b/Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp
index 27ce98a..a5f01e5 100644
--- a/Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp
+++ b/Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp
@@ -75,6 +75,9 @@ void TestReferenceWrapper()
 	always_check(ArrayA[0] == 2);
 	always_check(ArrayA[1] == 4);
 	always_check(ArrayA[2] == 6);
+
+	always_check((TIsSame<int32,  TUnwrapRefDecay<int32>::Type>::Value));
+	always_check((TIsSame<int32&, TUnwrapRefDecay<TReferenceWrapper<int32>>::Type>::Value));
 }
 
 void TestOptional()
diff --git a/Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h b/Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h
index 579acd2..c28dc9e 100644
--- a/Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h
+++ b/Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h
@@ -40,6 +40,11 @@ private:
 template <typename T>
 TReferenceWrapper(T&) -> TReferenceWrapper<T>;
 
+template <typename T> struct TUnwrapReference                       { using Type = T;  };
+template <typename T> struct TUnwrapReference<TReferenceWrapper<T>> { using Type = T&; };
+
+template <typename T> struct TUnwrapRefDecay { using Type = typename TUnwrapReference<typename TDecay<T>::Type>::Type; };
+
 NAMESPACE_MODULE_END(Utility)
 NAMESPACE_MODULE_END(Redcraft)
 NAMESPACE_REDCRAFT_END