diff --git a/core/templates/local_vector.h b/core/templates/local_vector.h
index b45eeae4fc9a..2480d10890db 100644
--- a/core/templates/local_vector.h
+++ b/core/templates/local_vector.h
@@ -200,6 +200,7 @@ class LocalVector {
 		return data[p_index];
 	}
 
+	struct ConstIterator;
 	struct Iterator {
 		_FORCE_INLINE_ T &operator*() const {
 			return *elem_ptr;
@@ -221,6 +222,10 @@ class LocalVector {
 		Iterator() {}
 		Iterator(const Iterator &p_it) { elem_ptr = p_it.elem_ptr; }
 
+		operator ConstIterator() const {
+			return ConstIterator(elem_ptr);
+		}
+
 	private:
 		T *elem_ptr = nullptr;
 	};
diff --git a/core/templates/rb_map.h b/core/templates/rb_map.h
index 7c207928af38..29f6c096a201 100644
--- a/core/templates/rb_map.h
+++ b/core/templates/rb_map.h
@@ -96,6 +96,7 @@ class RBMap {
 
 	typedef KeyValue<K, V> ValueType;
 
+	struct ConstIterator;
 	struct Iterator {
 		friend class RBMap<K, V, C, A>;
 
@@ -126,6 +127,10 @@ class RBMap {
 		Iterator() {}
 		Iterator(const Iterator &p_it) { E = p_it.E; }
 
+		operator ConstIterator() const {
+			return ConstIterator(E);
+		}
+
 	private:
 		Element *E = nullptr;
 	};
diff --git a/core/templates/rb_set.h b/core/templates/rb_set.h
index 798353957c56..383da01b9e0d 100644
--- a/core/templates/rb_set.h
+++ b/core/templates/rb_set.h
@@ -83,6 +83,7 @@ class RBSet {
 
 	typedef T ValueType;
 
+	struct ConstIterator;
 	struct Iterator {
 		_FORCE_INLINE_ T &operator*() const {
 			return E->get();
@@ -105,6 +106,10 @@ class RBSet {
 		Iterator() {}
 		Iterator(const Iterator &p_it) { E = p_it.E; }
 
+		operator ConstIterator() const {
+			return ConstIterator(E);
+		}
+
 	private:
 		Element *E = nullptr;
 	};
diff --git a/core/templates/vector.h b/core/templates/vector.h
index 631564d71092..3a11c0882a7e 100644
--- a/core/templates/vector.h
+++ b/core/templates/vector.h
@@ -256,6 +256,7 @@ class Vector {
 		return false;
 	}
 
+	struct ConstIterator;
 	struct Iterator {
 		_FORCE_INLINE_ T &operator*() const {
 			return *elem_ptr;
@@ -277,6 +278,10 @@ class Vector {
 		Iterator() {}
 		Iterator(const Iterator &p_it) { elem_ptr = p_it.elem_ptr; }
 
+		operator ConstIterator() const {
+			return ConstIterator(elem_ptr);
+		}
+
 	private:
 		T *elem_ptr = nullptr;
 	};