[Glacier] Factor Vector iterator logic into standalone class.

lib/glacier/container/array_iter.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace glcr {
+
+template <typename T>
+class ArrayIterator {
+ public:
+  ArrayIterator(T* item, uint64_t size) : item_(item), size_(size) {}
+
+  ArrayIterator next() {
+    if (size_ <= 1) {
+      return {nullptr, 0};
+    }
+    return {item_ + 1, size_ - 1};
+  }
+
+  ArrayIterator& operator++() {
+    if (size_ <= 1) {
+      item_ = nullptr;
+      size_ = 0;
+    } else {
+      item_++;
+      size_--;
+    }
+    return *this;
+  }
+
+  T& operator*() { return *item_; }
+  T* operator->() { return item_; }
+  bool operator==(const ArrayIterator& other) { return item_ == other.item_; }
+  bool operator!=(const ArrayIterator& other) { return item_ != other.item_; }
+
+ private:
+  T* item_;
+  uint64_t size_;
+};
+
+}  // namespace glcr

lib/glacier/container/vector.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <glacier/container/array_iter.h>
 #include <glacier/memory/move.h>
 #include <stdint.h>
 
@@ -48,38 +49,7 @@ class Vector {
 
   T&& PopBack();
 
-  // Forward Iter
-  class Iterator {
-   public:
-    Iterator(T* item, uint64_t size) : item_(item), size_(size) {}
-
-    Iterator next() {
-      if (size_ <= 1) {
-        return {nullptr, 0};
-      }
-      return {item_ + 1, size_ - 1};
-    }
-
-    Iterator& operator++() {
-      if (size_ <= 1) {
-        item_ = nullptr;
-        size_ = 0;
-      } else {
-        item_++;
-        size_--;
-      }
-      return *this;
-    }
-
-    T& operator*() { return *item_; }
-    T* operator->() { return item_; }
-    bool operator==(const Iterator& other) { return item_ == other.item_; }
-    bool operator!=(const Iterator& other) { return item_ != other.item_; }
-
-   private:
-    T* item_;
-    uint64_t size_;
-  };
+  typedef ArrayIterator<T> Iterator;
 
   Iterator begin() { return {data_, size_}; }
   const Iterator begin() const { return {data_, size_}; }