diff --git a/uppsrc/Core/Topt.h b/uppsrc/Core/Topt.h
index 68d5973e7..3082d9dee 100644
--- a/uppsrc/Core/Topt.h
+++ b/uppsrc/Core/Topt.h
@@ -344,6 +344,9 @@ public:
 template <class Range>
 using ValueTypeOf = typename std::remove_reference<decltype(*((Range *)0)->begin())>::type;
 
+template <class Range>
+using ValueTypeOfArray = typename std::remove_reference<decltype((*((Range *)0))[0])>::type;
+
 template <class Range>
 using IteratorOf = decltype(((Range *)0)->begin());
 
@@ -352,10 +355,10 @@ using ConstIteratorOf = decltype(((const Range *)0)->begin());
 
 template <class V>
 class ConstIIterator {
-protected:
+	typedef ValueTypeOfArray<V> T;
+
 	const V       *cont;
 	int            ii;
-	typedef        ValueTypeOf<V> T;
 	struct NP { int dummy; };
 
 public:
@@ -394,10 +397,10 @@ public:
 
 template <class V>
 class IIterator {
-protected:
+	typedef ValueTypeOfArray<V> T;
+
 	V             *cont;
 	int            ii;
-	typedef        ValueTypeOf<V> T;
 	struct NP { int dummy; };
 
 public:
diff --git a/uppsrc/Core/todo.txt b/uppsrc/Core/todo.txt
index d102385fe..0868954be 100644
--- a/uppsrc/Core/todo.txt
+++ b/uppsrc/Core/todo.txt
@@ -24,7 +24,6 @@ Buffer(size_t size, const T& init)   { ptr = new T[size]; Fill(ptr, ptr + size,
 
 String  MD5Digest(const void *data, int length);
 
-IIterator	typedef        typename V::ValueType T;
 Remove ValueType uses
 
 InVector::InsertN possibly incorrect (can create small blocks)
@@ -36,6 +35,8 @@ CoWork pipe max_queue
 -----------------------
 DONE
 
+IIterator	typedef        typename V::ValueType T;
+
 SerializeRaw - int64!
 
 StringBuffer 2GB limit