diff --git a/Redcraft.Utility/Source/Public/Containers/Array.h b/Redcraft.Utility/Source/Public/Containers/Array.h
index ac9c5ae..99092d1 100644
--- a/Redcraft.Utility/Source/Public/Containers/Array.h
+++ b/Redcraft.Utility/Source/Public/Containers/Array.h
@@ -1,14 +1,18 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Memory/Allocator.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
-#include "TypeTraits/TypeTraits.h"
-#include "Miscellaneous/Compare.h"
+#include "Memory/Allocator.h"
 #include "Memory/MemoryOperator.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Iterator/ReverseIterator.h"
+#include "Range/Utility.h"
+#include "Range/Factory.h"
+#include "Miscellaneous/Compare.h"
 #include "Miscellaneous/AssertionMacros.h"
 
 NAMESPACE_REDCRAFT_BEGIN
diff --git a/Redcraft.Utility/Source/Public/Containers/ArrayView.h b/Redcraft.Utility/Source/Public/Containers/ArrayView.h
index 43e8060..6b8c79c 100644
--- a/Redcraft.Utility/Source/Public/Containers/ArrayView.h
+++ b/Redcraft.Utility/Source/Public/Containers/ArrayView.h
@@ -1,15 +1,15 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Memory/Address.h"
-#include "Memory/Allocator.h"
-#include "Containers/Array.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Iterator/ReverseIterator.h"
+#include "Containers/Array.h"
 #include "Containers/StaticArray.h"
-#include "TypeTraits/TypeTraits.h"
 #include "Miscellaneous/Compare.h"
 #include "Miscellaneous/AssertionMacros.h"
 
diff --git a/Redcraft.Utility/Source/Public/Containers/Bitset.h b/Redcraft.Utility/Source/Public/Containers/Bitset.h
index 4f83ca4..7c0bcd0 100644
--- a/Redcraft.Utility/Source/Public/Containers/Bitset.h
+++ b/Redcraft.Utility/Source/Public/Containers/Bitset.h
@@ -1,16 +1,17 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Memory/Memory.h"
-#include "Memory/Allocator.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
 #include "Templates/Noncopyable.h"
-#include "TypeTraits/TypeTraits.h"
+#include "Memory/Allocator.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Iterator/ReverseIterator.h"
+#include "Range/Utility.h"
 #include "Miscellaneous/Compare.h"
-#include "Memory/MemoryOperator.h"
 #include "Miscellaneous/AssertionMacros.h"
 
 NAMESPACE_REDCRAFT_BEGIN
diff --git a/Redcraft.Utility/Source/Public/Containers/List.h b/Redcraft.Utility/Source/Public/Containers/List.h
index 221cd1d..ef38759 100644
--- a/Redcraft.Utility/Source/Public/Containers/List.h
+++ b/Redcraft.Utility/Source/Public/Containers/List.h
@@ -1,14 +1,18 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Memory/Allocator.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
-#include "TypeTraits/TypeTraits.h"
-#include "Miscellaneous/Compare.h"
+#include "Memory/Allocator.h"
 #include "Memory/MemoryOperator.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Iterator/ReverseIterator.h"
+#include "Range/Utility.h"
+#include "Range/Factory.h"
+#include "Miscellaneous/Compare.h"
 #include "Miscellaneous/AssertionMacros.h"
 
 NAMESPACE_REDCRAFT_BEGIN
diff --git a/Redcraft.Utility/Source/Public/Containers/StaticArray.h b/Redcraft.Utility/Source/Public/Containers/StaticArray.h
index 956e486..d89fd2d 100644
--- a/Redcraft.Utility/Source/Public/Containers/StaticArray.h
+++ b/Redcraft.Utility/Source/Public/Containers/StaticArray.h
@@ -1,12 +1,13 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Templates/Meta.h"
-#include "Iterator/Iterator.h"
-#include "Templates/Utility.h"
-#include "Templates/TypeHash.h"
 #include "TypeTraits/TypeTraits.h"
+#include "Templates/Utility.h"
+#include "Templates/Meta.h"
+#include "Templates/TypeHash.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/ReverseIterator.h"
 #include "Miscellaneous/Compare.h"
 #include "Miscellaneous/AssertionMacros.h"
 
diff --git a/Redcraft.Utility/Source/Public/Containers/StaticBitset.h b/Redcraft.Utility/Source/Public/Containers/StaticBitset.h
index 7830525..08d6771 100644
--- a/Redcraft.Utility/Source/Public/Containers/StaticBitset.h
+++ b/Redcraft.Utility/Source/Public/Containers/StaticBitset.h
@@ -1,14 +1,14 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
 #include "Templates/Noncopyable.h"
-#include "TypeTraits/TypeTraits.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/ReverseIterator.h"
 #include "Miscellaneous/Compare.h"
-#include "Memory/MemoryOperator.h"
 #include "Miscellaneous/AssertionMacros.h"
 
 NAMESPACE_REDCRAFT_BEGIN
diff --git a/Redcraft.Utility/Source/Public/Iterator/BasicIterator.h b/Redcraft.Utility/Source/Public/Iterator/BasicIterator.h
new file mode 100644
index 0000000..656b04c
--- /dev/null
+++ b/Redcraft.Utility/Source/Public/Iterator/BasicIterator.h
@@ -0,0 +1,250 @@
+#pragma once
+
+#include "CoreTypes.h"
+#include "Memory/Address.h"
+#include "Iterator/Utility.h"
+#include "Iterator/Sentinel.h"
+#include "Miscellaneous/Compare.h"
+#include "TypeTraits/TypeTraits.h"
+
+NAMESPACE_REDCRAFT_BEGIN
+NAMESPACE_MODULE_BEGIN(Redcraft)
+NAMESPACE_MODULE_BEGIN(Utility)
+
+#if PLATFORM_COMPILER_GCC
+#	pragma GCC diagnostic push
+#	pragma GCC diagnostic ignored "-Wnon-template-friend"
+#endif
+
+/** A concept specifies a type is an input iterator. It is input iterator, incrementable, and sentinel for itself. */
+template <typename I>
+concept CForwardIterator = CInputIterator<I> && CIncrementable<I> && CSentinelFor<I, I>;
+
+/** This is an example of a forward iterator, indicate the traits that define a forward iterator. */
+template <CReferenceable T>
+struct IForwardIterator /* : IInputIterator<T>, IIncrementable, ISentinelFor<IForwardIterator> */
+{
+	// ~Begin CInputIterator.
+
+	using FElementType = TRemoveCVRef<T>;
+
+	// ~End CInputIterator.
+
+	// ~Begin CIncrementable and CSentinelFor<IForwardIterator>.
+
+	IForwardIterator();
+	IForwardIterator(const IForwardIterator&);
+	IForwardIterator(IForwardIterator&&);                 // Also satisfies IInputIterator.
+	IForwardIterator* operator=(const IForwardIterator&);
+	IForwardIterator* operator=(IForwardIterator&&);      // Also satisfies IInputIterator.
+
+	friend bool operator==(const IForwardIterator&, const IForwardIterator&);
+
+	// ~End CIncrementable and CSentinelFor<IForwardIterator>.
+
+	// ~Begin CInputIterator.
+
+	T operator*() const; // Optional satisfies CIndirectlyWritable.
+
+	IForwardIterator& operator++(); // Also satisfies CIncrementable.
+
+	IForwardIterator operator++(int); // Also satisfies CIncrementable.
+
+	// ~End CInputIterator.
+};
+
+// Use IForwardIterator<int> represents a forward iterator.
+static_assert(CForwardIterator<IForwardIterator<int&>>);
+static_assert( COutputIterator<IForwardIterator<int&>, int>);
+
+/** A concept specifies a type is a bidirectional iterator. Add the decrement operator to the forward iterator. */
+template <typename I>
+concept CBidirectionalIterator = CForwardIterator<I>
+	&& requires(I Iter) {
+		{ --Iter } -> CSameAs<I&>;
+		{ Iter-- } -> CSameAs<I >;
+	};
+
+/**
+ * This is an example of a bidirectional iterator, indicate the traits that define a bidirectional iterator.
+ * Regardless of the order in which the increment and decrement operators are applied,
+ * the result is always the same if both operations are performed the same number of times.
+ */
+template <CReferenceable T>
+struct IBidirectionalIterator /* : IForwardIterator<T> */
+{
+	// ~Begin CForwardIterator.
+
+	using FElementType = TRemoveCVRef<T>;
+
+	IBidirectionalIterator();
+	IBidirectionalIterator(const IBidirectionalIterator&);
+	IBidirectionalIterator(IBidirectionalIterator&&);
+	IBidirectionalIterator* operator=(const IBidirectionalIterator&);
+	IBidirectionalIterator* operator=(IBidirectionalIterator&&);
+
+	friend bool operator==(const IBidirectionalIterator&, const IBidirectionalIterator&);
+
+	T operator*() const;
+
+	// ~End CForwardIterator.
+
+	IBidirectionalIterator& operator++(); // Also satisfies CForwardIterator.
+	IBidirectionalIterator& operator--();
+
+	IBidirectionalIterator operator++(int); // Also satisfies CForwardIterator.
+	IBidirectionalIterator operator--(int);
+};
+
+// Use IBidirectionalIterator<int> represents a bidirectional iterator.
+static_assert(CBidirectionalIterator<IBidirectionalIterator<int&>>);
+static_assert(       COutputIterator<IBidirectionalIterator<int&>, int>);
+
+/**
+ * A concept specifies a type is a random access iterator.
+ * Add the three-way comparison, addition, subtraction and subscript operators to the bidirectional iterator.
+ */
+template <typename I>
+concept CRandomAccessIterator = CBidirectionalIterator<I> && CTotallyOrdered<I> && CSizedSentinelFor<I, I>
+	&& requires(I Iter, const I Jter, const ptrdiff N) {
+		{ Iter   += N } -> CSameAs<I&>;
+		{ Jter   +  N } -> CSameAs<I >;
+		{ N +  Jter   } -> CSameAs<I >;
+		{ Iter   -= N } -> CSameAs<I&>;
+		{ Jter   -  N } -> CSameAs<I >;
+		{   Jter[N]   } -> CSameAs<TIteratorReference<I>>;
+	};
+
+/** This is an example of a random access iterator, indicate the traits that define a random access iterator. */
+template <CReferenceable T>
+struct IRandomAccessIterator /* : IBidirectionalIterator<T>, ISizedSentinelFor<IRandomAccessIterator> */
+{
+	// ~Begin CBidirectionalIterator.
+
+	using FElementType = TRemoveCVRef<T>;
+
+	// ~End CBidirectionalIterator.
+
+	// ~Begin CBidirectionalIterator and CSizedSentinelFor<IRandomAccessIterator>.
+
+	IRandomAccessIterator();
+	IRandomAccessIterator(const IRandomAccessIterator&);
+	IRandomAccessIterator(IRandomAccessIterator&&);
+	IRandomAccessIterator* operator=(const IRandomAccessIterator&);
+	IRandomAccessIterator* operator=(IRandomAccessIterator&&);
+
+	friend bool operator==(const IRandomAccessIterator&, const IRandomAccessIterator&);
+
+	// ~End CBidirectionalIterator and CSizedSentinelFor<IRandomAccessIterator>.
+
+	friend strong_ordering operator<=>(const IRandomAccessIterator&, const IRandomAccessIterator&);
+
+	T operator*() const; // Also satisfies CBidirectionalIterator.
+
+	T operator[](ptrdiff) const;
+
+	// ~Begin CBidirectionalIterator.
+
+	IRandomAccessIterator& operator++();
+	IRandomAccessIterator& operator--();
+
+	IRandomAccessIterator operator++(int);
+	IRandomAccessIterator operator--(int);
+
+	// ~End CBidirectionalIterator.
+
+	IRandomAccessIterator& operator+=(ptrdiff);
+	IRandomAccessIterator& operator-=(ptrdiff);
+
+	IRandomAccessIterator operator+(ptrdiff) const;
+	IRandomAccessIterator operator-(ptrdiff) const;
+
+	friend IRandomAccessIterator operator+(ptrdiff, const IRandomAccessIterator&);
+
+	friend ptrdiff operator-(const IRandomAccessIterator&, const IRandomAccessIterator&); // Also satisfies CSizedSentinelFor<IRandomAccessIterator>.
+};
+
+// Use IRandomAccessIterator<int> represents a random access iterator
+static_assert(CRandomAccessIterator<IRandomAccessIterator<int&>>);
+static_assert(      COutputIterator<IRandomAccessIterator<int&>, int>);
+
+/**
+ * A concept specifies a type is a contiguous iterator.
+ * Add the operator-> to the random access iterator and requires the operator* returns a true reference type.
+ */
+template <typename I>
+concept CContiguousIterator = CRandomAccessIterator<I> && CLValueReference<TIteratorReference<I>>
+	&& CSameAs<TIteratorElement<I>, TRemoveCVRef<TIteratorReference<I>>>
+	&& CSameAs<TIteratorPointer<I>,  TAddPointer<TIteratorReference<I>>>
+	&& requires(I& Iter)
+	{
+		{ ToAddress(Iter) } -> CSameAs<TAddPointer<TIteratorReference<I>>>;
+	};
+
+/** This is an example of a contiguous iterator, indicate the traits that define a contiguous iterator. */
+template <CLValueReference T>
+struct IContiguousIterator /* : IRandomAccessIterator<T> */
+{
+	// ~Begin CRandomAccessIterator.
+
+	using FElementType = TRemoveCVRef<T>;
+
+	IContiguousIterator();
+	IContiguousIterator(const IContiguousIterator&);
+	IContiguousIterator(IContiguousIterator&&);
+	IContiguousIterator* operator=(const IContiguousIterator&);
+	IContiguousIterator* operator=(IContiguousIterator&&);
+
+	friend bool operator==(const IContiguousIterator&, const IContiguousIterator&);
+
+	friend strong_ordering operator<=>(const IContiguousIterator&, const IContiguousIterator&);
+
+	// ~End CRandomAccessIterator.
+
+	/**
+	 * Dereference operator. See IForwardIterator.
+	 * Specify, the return type must be a true reference type and refer to an element of a contiguous sequence, not a proxy class.
+	 * Also satisfies CRandomAccessIterator.
+	 */
+	T operator*() const;
+
+	/** Indirection operator. Return the address of the element that the iterator is pointing to. */
+	TAddPointer<T> operator->() const;
+
+	// ~Begin CRandomAccessIterator.
+
+	T operator[](ptrdiff) const;
+
+	IContiguousIterator& operator++();
+	IContiguousIterator& operator--();
+
+	IContiguousIterator operator++(int);
+	IContiguousIterator operator--(int);
+
+	IContiguousIterator& operator+=(ptrdiff);
+	IContiguousIterator& operator-=(ptrdiff);
+
+	IContiguousIterator operator+(ptrdiff) const;
+	IContiguousIterator operator-(ptrdiff) const;
+
+	friend IContiguousIterator operator+(ptrdiff, const IContiguousIterator&);
+
+	friend ptrdiff operator-(const IContiguousIterator&, const IContiguousIterator&);
+
+	// ~End CRandomAccessIterator.
+};
+
+// Use IContiguousIterator<int> represents a contiguous iterator
+static_assert(CContiguousIterator<IContiguousIterator<int&>>);
+static_assert(    COutputIterator<IContiguousIterator<int&>, int>);
+
+// The int* is the most typical example of a contiguous iterator
+static_assert(CContiguousIterator<int*>);
+
+#if PLATFORM_COMPILER_GCC
+#	pragma GCC diagnostic pop
+#endif
+
+NAMESPACE_MODULE_END(Utility)
+NAMESPACE_MODULE_END(Redcraft)
+NAMESPACE_REDCRAFT_END
diff --git a/Redcraft.Utility/Source/Public/Iterator/BidirectionalIterator.h b/Redcraft.Utility/Source/Public/Iterator/BidirectionalIterator.h
deleted file mode 100644
index b75ef52..0000000
--- a/Redcraft.Utility/Source/Public/Iterator/BidirectionalIterator.h
+++ /dev/null
@@ -1,67 +0,0 @@
-#pragma once
-
-#include "CoreTypes.h"
-#include "Iterator/Utility.h"
-#include "Iterator/Sentinel.h"
-#include "Iterator/ForwardIterator.h"
-#include "TypeTraits/TypeTraits.h"
-
-NAMESPACE_REDCRAFT_BEGIN
-NAMESPACE_MODULE_BEGIN(Redcraft)
-NAMESPACE_MODULE_BEGIN(Utility)
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic push
-#	pragma GCC diagnostic ignored "-Wnon-template-friend"
-#endif
-
-/** A concept specifies a type is a bidirectional iterator. Add the decrement operator to the forward iterator. */
-template <typename I>
-concept CBidirectionalIterator = CForwardIterator<I>
-	&& requires(I Iter) {
-		{ --Iter } -> CSameAs<I&>;
-		{ Iter-- } -> CSameAs<I >;
-	};
-
-/**
- * This is an example of a bidirectional iterator, indicate the traits that define a bidirectional iterator.
- * Regardless of the order in which the increment and decrement operators are applied,
- * the result is always the same if both operations are performed the same number of times.
- */
-template <CReferenceable T>
-struct IBidirectionalIterator /* : IForwardIterator<T> */
-{
-	// ~Begin CForwardIterator.
-
-	using FElementType = TRemoveCVRef<T>;
-
-	IBidirectionalIterator();
-	IBidirectionalIterator(const IBidirectionalIterator&);
-	IBidirectionalIterator(IBidirectionalIterator&&);
-	IBidirectionalIterator* operator=(const IBidirectionalIterator&);
-	IBidirectionalIterator* operator=(IBidirectionalIterator&&);
-
-	friend bool operator==(const IBidirectionalIterator&, const IBidirectionalIterator&);
-
-	T operator*() const;
-
-	// ~End CForwardIterator.
-
-	IBidirectionalIterator& operator++(); // Also satisfies CForwardIterator.
-	IBidirectionalIterator& operator--();
-
-	IBidirectionalIterator operator++(int); // Also satisfies CForwardIterator.
-	IBidirectionalIterator operator--(int);
-};
-
-// Use IBidirectionalIterator<int> represents a bidirectional iterator.
-static_assert(CBidirectionalIterator<IBidirectionalIterator<int&>>);
-static_assert(       COutputIterator<IBidirectionalIterator<int&>, int>);
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic pop
-#endif
-
-NAMESPACE_MODULE_END(Utility)
-NAMESPACE_MODULE_END(Redcraft)
-NAMESPACE_REDCRAFT_END
diff --git a/Redcraft.Utility/Source/Public/Iterator/ContiguousIterator.h b/Redcraft.Utility/Source/Public/Iterator/ContiguousIterator.h
deleted file mode 100644
index c155721..0000000
--- a/Redcraft.Utility/Source/Public/Iterator/ContiguousIterator.h
+++ /dev/null
@@ -1,98 +0,0 @@
-#pragma once
-
-#include "CoreTypes.h"
-#include "Iterator/Utility.h"
-#include "Iterator/Sentinel.h"
-#include "Iterator/RandomAccessIterator.h"
-#include "TypeTraits/TypeTraits.h"
-#include "Memory/Address.h"
-
-NAMESPACE_REDCRAFT_BEGIN
-NAMESPACE_MODULE_BEGIN(Redcraft)
-NAMESPACE_MODULE_BEGIN(Utility)
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic push
-#	pragma GCC diagnostic ignored "-Wnon-template-friend"
-#endif
-
-/**
- * A concept specifies a type is a contiguous iterator.
- * Add the operator-> to the random access iterator and requires the operator* returns a true reference type.
- */
-template <typename I>
-concept CContiguousIterator = CRandomAccessIterator<I> && CLValueReference<TIteratorReference<I>>
-	&& CSameAs<TIteratorElement<I>, TRemoveCVRef<TIteratorReference<I>>>
-	&& CSameAs<TIteratorPointer<I>,  TAddPointer<TIteratorReference<I>>>
-	&& requires(I& Iter)
-	{
-		{ ToAddress(Iter) } -> CSameAs<TAddPointer<TIteratorReference<I>>>;
-	};
-
-/** This is an example of a contiguous iterator, indicate the traits that define a contiguous iterator. */
-template <CLValueReference T>
-struct IContiguousIterator /* : IRandomAccessIterator<T> */
-{
-	// ~Begin CRandomAccessIterator.
-
-	using FElementType = TRemoveCVRef<T>;
-
-	IContiguousIterator();
-	IContiguousIterator(const IContiguousIterator&);
-	IContiguousIterator(IContiguousIterator&&);
-	IContiguousIterator* operator=(const IContiguousIterator&);
-	IContiguousIterator* operator=(IContiguousIterator&&);
-
-	friend bool operator==(const IContiguousIterator&, const IContiguousIterator&);
-
-	friend strong_ordering operator<=>(const IContiguousIterator&, const IContiguousIterator&);
-
-	// ~End CRandomAccessIterator.
-
-	/**
-	 * Dereference operator. See IForwardIterator.
-	 * Specify, the return type must be a true reference type and refer to an element of a contiguous sequence, not a proxy class.
-	 * Also satisfies CRandomAccessIterator.
-	 */
-	T operator*() const;
-
-	/** Indirection operator. Return the address of the element that the iterator is pointing to. */
-	TAddPointer<T> operator->() const;
-
-	// ~Begin CRandomAccessIterator.
-
-	T operator[](ptrdiff) const;
-
-	IContiguousIterator& operator++();
-	IContiguousIterator& operator--();
-
-	IContiguousIterator operator++(int);
-	IContiguousIterator operator--(int);
-
-	IContiguousIterator& operator+=(ptrdiff);
-	IContiguousIterator& operator-=(ptrdiff);
-
-	IContiguousIterator operator+(ptrdiff) const;
-	IContiguousIterator operator-(ptrdiff) const;
-
-	friend IContiguousIterator operator+(ptrdiff, const IContiguousIterator&);
-
-	friend ptrdiff operator-(const IContiguousIterator&, const IContiguousIterator&);
-
-	// ~End CRandomAccessIterator.
-};
-
-// Use IContiguousIterator<int> represents a contiguous iterator
-static_assert(CContiguousIterator<IContiguousIterator<int&>>);
-static_assert(    COutputIterator<IContiguousIterator<int&>, int>);
-
-// The int* is the most typical example of a contiguous iterator
-static_assert(CContiguousIterator<int*>);
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic pop
-#endif
-
-NAMESPACE_MODULE_END(Utility)
-NAMESPACE_MODULE_END(Redcraft)
-NAMESPACE_REDCRAFT_END
diff --git a/Redcraft.Utility/Source/Public/Iterator/CountedIterator.h b/Redcraft.Utility/Source/Public/Iterator/CountedIterator.h
index eeb12ad..827386b 100644
--- a/Redcraft.Utility/Source/Public/Iterator/CountedIterator.h
+++ b/Redcraft.Utility/Source/Public/Iterator/CountedIterator.h
@@ -3,9 +3,7 @@
 #include "CoreTypes.h"
 #include "Iterator/Utility.h"
 #include "Iterator/Sentinel.h"
-#include "Iterator/BidirectionalIterator.h"
-#include "Iterator/RandomAccessIterator.h"
-#include "Iterator/ContiguousIterator.h"
+#include "Iterator/BasicIterator.h"
 #include "Miscellaneous/AssertionMacros.h"
 #include "Miscellaneous/Compare.h"
 #include "TypeTraits/TypeTraits.h"
diff --git a/Redcraft.Utility/Source/Public/Iterator/ForwardIterator.h b/Redcraft.Utility/Source/Public/Iterator/ForwardIterator.h
deleted file mode 100644
index 27233c5..0000000
--- a/Redcraft.Utility/Source/Public/Iterator/ForwardIterator.h
+++ /dev/null
@@ -1,64 +0,0 @@
-#pragma once
-
-#include "CoreTypes.h"
-#include "Iterator/Utility.h"
-#include "Iterator/Sentinel.h"
-#include "TypeTraits/TypeTraits.h"
-
-NAMESPACE_REDCRAFT_BEGIN
-NAMESPACE_MODULE_BEGIN(Redcraft)
-NAMESPACE_MODULE_BEGIN(Utility)
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic push
-#	pragma GCC diagnostic ignored "-Wnon-template-friend"
-#endif
-
-/** A concept specifies a type is an input iterator. It is input iterator, incrementable, and sentinel for itself. */
-template <typename I>
-concept CForwardIterator = CInputIterator<I> && CIncrementable<I> && CSentinelFor<I, I>;
-
-/** This is an example of a forward iterator, indicate the traits that define a forward iterator. */
-template <CReferenceable T>
-struct IForwardIterator /* : IInputIterator<T>, IIncrementable, ISentinelFor<IForwardIterator> */
-{
-	// ~Begin CInputIterator.
-
-	using FElementType = TRemoveCVRef<T>;
-
-	// ~End CInputIterator.
-
-	// ~Begin CIncrementable and CSentinelFor<IForwardIterator>.
-
-	IForwardIterator();
-	IForwardIterator(const IForwardIterator&);
-	IForwardIterator(IForwardIterator&&);                 // Also satisfies IInputIterator.
-	IForwardIterator* operator=(const IForwardIterator&);
-	IForwardIterator* operator=(IForwardIterator&&);      // Also satisfies IInputIterator.
-
-	friend bool operator==(const IForwardIterator&, const IForwardIterator&);
-
-	// ~End CIncrementable and CSentinelFor<IForwardIterator>.
-
-	// ~Begin CInputIterator.
-
-	T operator*() const; // Optional satisfies CIndirectlyWritable.
-
-	IForwardIterator& operator++(); // Also satisfies CIncrementable.
-
-	IForwardIterator operator++(int); // Also satisfies CIncrementable.
-
-	// ~End CInputIterator.
-};
-
-// Use IForwardIterator<int> represents a forward iterator.
-static_assert(CForwardIterator<IForwardIterator<int&>>);
-static_assert( COutputIterator<IForwardIterator<int&>, int>);
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic pop
-#endif
-
-NAMESPACE_MODULE_END(Utility)
-NAMESPACE_MODULE_END(Redcraft)
-NAMESPACE_REDCRAFT_END
diff --git a/Redcraft.Utility/Source/Public/Iterator/Iterator.h b/Redcraft.Utility/Source/Public/Iterator/Iterator.h
index 2aa426d..4573cb6 100644
--- a/Redcraft.Utility/Source/Public/Iterator/Iterator.h
+++ b/Redcraft.Utility/Source/Public/Iterator/Iterator.h
@@ -3,10 +3,7 @@
 #include "CoreTypes.h"
 #include "Iterator/Utility.h"
 #include "Iterator/Sentinel.h"
-#include "Iterator/ForwardIterator.h"
-#include "Iterator/BidirectionalIterator.h"
-#include "Iterator/RandomAccessIterator.h"
-#include "Iterator/ContiguousIterator.h"
+#include "Iterator/BasicIterator.h"
 #include "Iterator/ReverseIterator.h"
 #include "Iterator/MoveIterator.h"
 #include "Iterator/CountedIterator.h"
diff --git a/Redcraft.Utility/Source/Public/Iterator/MoveIterator.h b/Redcraft.Utility/Source/Public/Iterator/MoveIterator.h
index 3993072..ef9e590 100644
--- a/Redcraft.Utility/Source/Public/Iterator/MoveIterator.h
+++ b/Redcraft.Utility/Source/Public/Iterator/MoveIterator.h
@@ -3,10 +3,7 @@
 #include "CoreTypes.h"
 #include "Iterator/Utility.h"
 #include "Iterator/Sentinel.h"
-#include "Iterator/ForwardIterator.h"
-#include "Iterator/BidirectionalIterator.h"
-#include "Iterator/RandomAccessIterator.h"
-#include "Iterator/ContiguousIterator.h"
+#include "Iterator/BasicIterator.h"
 #include "Miscellaneous/Compare.h"
 #include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
diff --git a/Redcraft.Utility/Source/Public/Iterator/RandomAccessIterator.h b/Redcraft.Utility/Source/Public/Iterator/RandomAccessIterator.h
deleted file mode 100644
index c0e225b..0000000
--- a/Redcraft.Utility/Source/Public/Iterator/RandomAccessIterator.h
+++ /dev/null
@@ -1,93 +0,0 @@
-#pragma once
-
-#include "CoreTypes.h"
-#include "Iterator/Utility.h"
-#include "Iterator/Sentinel.h"
-#include "Iterator/BidirectionalIterator.h"
-#include "Miscellaneous/Compare.h"
-#include "TypeTraits/TypeTraits.h"
-
-NAMESPACE_REDCRAFT_BEGIN
-NAMESPACE_MODULE_BEGIN(Redcraft)
-NAMESPACE_MODULE_BEGIN(Utility)
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic push
-#	pragma GCC diagnostic ignored "-Wnon-template-friend"
-#endif
-
-/**
- * A concept specifies a type is a random access iterator.
- * Add the three-way comparison, addition, subtraction and subscript operators to the bidirectional iterator.
- */
-template <typename I>
-concept CRandomAccessIterator = CBidirectionalIterator<I> && CTotallyOrdered<I> && CSizedSentinelFor<I, I>
-	&& requires(I Iter, const I Jter, const ptrdiff N) {
-		{ Iter   += N } -> CSameAs<I&>;
-		{ Jter   +  N } -> CSameAs<I >;
-		{ N +  Jter   } -> CSameAs<I >;
-		{ Iter   -= N } -> CSameAs<I&>;
-		{ Jter   -  N } -> CSameAs<I >;
-		{   Jter[N]   } -> CSameAs<TIteratorReference<I>>;
-	};
-
-/** This is an example of a random access iterator, indicate the traits that define a random access iterator. */
-template <CReferenceable T>
-struct IRandomAccessIterator /* : IBidirectionalIterator<T>, ISizedSentinelFor<IRandomAccessIterator> */
-{
-	// ~Begin CBidirectionalIterator.
-
-	using FElementType = TRemoveCVRef<T>;
-
-	// ~End CBidirectionalIterator.
-
-	// ~Begin CBidirectionalIterator and CSizedSentinelFor<IRandomAccessIterator>.
-
-	IRandomAccessIterator();
-	IRandomAccessIterator(const IRandomAccessIterator&);
-	IRandomAccessIterator(IRandomAccessIterator&&);
-	IRandomAccessIterator* operator=(const IRandomAccessIterator&);
-	IRandomAccessIterator* operator=(IRandomAccessIterator&&);
-
-	friend bool operator==(const IRandomAccessIterator&, const IRandomAccessIterator&);
-
-	// ~End CBidirectionalIterator and CSizedSentinelFor<IRandomAccessIterator>.
-
-	friend strong_ordering operator<=>(const IRandomAccessIterator&, const IRandomAccessIterator&);
-
-	T operator*() const; // Also satisfies CBidirectionalIterator.
-
-	T operator[](ptrdiff) const;
-
-	// ~Begin CBidirectionalIterator.
-
-	IRandomAccessIterator& operator++();
-	IRandomAccessIterator& operator--();
-
-	IRandomAccessIterator operator++(int);
-	IRandomAccessIterator operator--(int);
-
-	// ~End CBidirectionalIterator.
-
-	IRandomAccessIterator& operator+=(ptrdiff);
-	IRandomAccessIterator& operator-=(ptrdiff);
-
-	IRandomAccessIterator operator+(ptrdiff) const;
-	IRandomAccessIterator operator-(ptrdiff) const;
-
-	friend IRandomAccessIterator operator+(ptrdiff, const IRandomAccessIterator&);
-
-	friend ptrdiff operator-(const IRandomAccessIterator&, const IRandomAccessIterator&); // Also satisfies CSizedSentinelFor<IRandomAccessIterator>.
-};
-
-// Use IRandomAccessIterator<int> represents a random access iterator
-static_assert(CRandomAccessIterator<IRandomAccessIterator<int&>>);
-static_assert(      COutputIterator<IRandomAccessIterator<int&>, int>);
-
-#if PLATFORM_COMPILER_GCC
-#	pragma GCC diagnostic pop
-#endif
-
-NAMESPACE_MODULE_END(Utility)
-NAMESPACE_MODULE_END(Redcraft)
-NAMESPACE_REDCRAFT_END
diff --git a/Redcraft.Utility/Source/Public/Iterator/ReverseIterator.h b/Redcraft.Utility/Source/Public/Iterator/ReverseIterator.h
index bb8f02d..b0f6556 100644
--- a/Redcraft.Utility/Source/Public/Iterator/ReverseIterator.h
+++ b/Redcraft.Utility/Source/Public/Iterator/ReverseIterator.h
@@ -3,9 +3,7 @@
 #include "CoreTypes.h"
 #include "Iterator/Utility.h"
 #include "Iterator/Sentinel.h"
-#include "Iterator/BidirectionalIterator.h"
-#include "Iterator/RandomAccessIterator.h"
-#include "Iterator/ContiguousIterator.h"
+#include "Iterator/BasicIterator.h"
 #include "Miscellaneous/Compare.h"
 #include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
diff --git a/Redcraft.Utility/Source/Public/Range/FilterView.h b/Redcraft.Utility/Source/Public/Range/FilterView.h
index 1b74544..c064912 100644
--- a/Redcraft.Utility/Source/Public/Range/FilterView.h
+++ b/Redcraft.Utility/Source/Public/Range/FilterView.h
@@ -1,15 +1,16 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/View.h"
-#include "Range/Pipe.h"
-#include "Range/Utility.h"
-#include "Range/AllView.h"
-#include "Memory/Address.h"
-#include "Templates/Invoke.h"
-#include "Iterator/Iterator.h"
-#include "Templates/Utility.h"
 #include "TypeTraits/TypeTraits.h"
+#include "Templates/Utility.h"
+#include "Templates/Invoke.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Memory/Address.h"
+#include "Range/Utility.h"
+#include "Range/Pipe.h"
+#include "Range/View.h"
+#include "Range/AllView.h"
 
 NAMESPACE_REDCRAFT_BEGIN
 NAMESPACE_MODULE_BEGIN(Redcraft)
diff --git a/Redcraft.Utility/Source/Public/Range/Utility.h b/Redcraft.Utility/Source/Public/Range/Utility.h
index 1e8783e..c7b77de 100644
--- a/Redcraft.Utility/Source/Public/Range/Utility.h
+++ b/Redcraft.Utility/Source/Public/Range/Utility.h
@@ -1,9 +1,12 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Templates/Utility.h"
-#include "Iterator/Iterator.h"
 #include "TypeTraits/TypeTraits.h"
+#include "Templates/Utility.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Iterator/ReverseIterator.h"
 
 NAMESPACE_REDCRAFT_BEGIN
 NAMESPACE_MODULE_BEGIN(Redcraft)
diff --git a/Redcraft.Utility/Source/Public/Range/View.h b/Redcraft.Utility/Source/Public/Range/View.h
index e923149..c807345 100644
--- a/Redcraft.Utility/Source/Public/Range/View.h
+++ b/Redcraft.Utility/Source/Public/Range/View.h
@@ -1,10 +1,11 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Utility.h"
-#include "Iterator/Iterator.h"
-#include "Templates/Utility.h"
 #include "TypeTraits/TypeTraits.h"
+#include "Templates/Utility.h"
+#include "Iterator/Utility.h"
+#include "Iterator/Sentinel.h"
+#include "Range/Utility.h"
 
 NAMESPACE_REDCRAFT_BEGIN
 NAMESPACE_MODULE_BEGIN(Redcraft)
diff --git a/Redcraft.Utility/Source/Public/String/String.h b/Redcraft.Utility/Source/Public/String/String.h
index 67ecef6..9075d1b 100644
--- a/Redcraft.Utility/Source/Public/String/String.h
+++ b/Redcraft.Utility/Source/Public/String/String.h
@@ -1,17 +1,24 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "String/Char.h"
-#include "Containers/Array.h"
-#include "String/StringView.h"
-#include "Iterator/Iterator.h"
-#include "Templates/Utility.h"
-#include "Templates/Optional.h"
 #include "TypeTraits/TypeTraits.h"
-#include "Templates/Noncopyable.h"
+#include "Templates/Utility.h"
+#include "Templates/TypeHash.h"
+#include "Templates/Optional.h"
+#include "Memory/Allocator.h"
+#include "Containers/Array.h"
+#include "Containers/ArrayView.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "Range/Utility.h"
+#include "Range/Factory.h"
+#include "String/Char.h"
+#include "String/StringView.h"
 #include "Miscellaneous/AssertionMacros.h"
 
+#include <locale>
+
 NAMESPACE_REDCRAFT_BEGIN
 NAMESPACE_MODULE_BEGIN(Redcraft)
 NAMESPACE_MODULE_BEGIN(Utility)
diff --git a/Redcraft.Utility/Source/Public/String/StringView.h b/Redcraft.Utility/Source/Public/String/StringView.h
index 890682d..e11ed79 100644
--- a/Redcraft.Utility/Source/Public/String/StringView.h
+++ b/Redcraft.Utility/Source/Public/String/StringView.h
@@ -1,15 +1,17 @@
 #pragma once
 
 #include "CoreTypes.h"
-#include "Range/Range.h"
-#include "String/Char.h"
-#include "Memory/Allocator.h"
-#include "Iterator/Iterator.h"
+#include "TypeTraits/TypeTraits.h"
 #include "Templates/Utility.h"
 #include "Templates/TypeHash.h"
-#include "Containers/ArrayView.h"
-#include "TypeTraits/TypeTraits.h"
+#include "Templates/Noncopyable.h"
+#include "Memory/Allocator.h"
 #include "Memory/MemoryOperator.h"
+#include "Containers/ArrayView.h"
+#include "Iterator/Utility.h"
+#include "Iterator/BasicIterator.h"
+#include "Iterator/Sentinel.h"
+#include "String/Char.h"
 #include "Miscellaneous/AssertionMacros.h"
 
 #include <cstring>