diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6a86a7..daab850 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ endif()
 
 include_directories(src)
 
-set(INDEX_CC_FILES "${INDEX_CC_FILES}" "src/ranges/range_base.cc")
+set(INDEX_CC_FILES "${INDEX_CC_FILES}" "src/ranges/range_base.cc" "src/ranges/index_info.cc")
 set(MA_CC_FILES "${MA_CC_FILES}" "${INDEX_CC_FILES}" "src/operation_utils.cc")
 
 add_executable(iutest src/ranges/tests/index_unit_test.cc ${INDEX_CC_FILES})
diff --git a/src/ranges/index_info.cc b/src/ranges/index_info.cc
index f4c4f28..824051f 100644
--- a/src/ranges/index_info.cc
+++ b/src/ranges/index_info.cc
@@ -1,9 +1,41 @@
 
 #include "index_info.h"
+#include "range_base.h"
 
 namespace MultiArrayTools
 {
+    
+    bool IndexInfo::operator==(const IndexInfo& in) const
+    {
+	return mPtrNum == in.mPtrNum;
+    }
+    
+    bool IndexInfo::operator!=(const IndexInfo& in) const
+    {
+	return mPtrNum != in.mPtrNum;
+    }
 
+    bool IndexInfo::operator<=(const IndexInfo& in) const
+    {
+	return mPtrNum <= in.mPtrNum;
+    }
+
+    bool IndexInfo::operator<(const IndexInfo& in) const
+    {
+	return mPtrNum < in.mPtrNum;
+    }
+
+    bool IndexInfo::operator>(const IndexInfo& in) const
+    {
+	return mPtrNum > in.mPtrNum;
+    }
+
+    bool IndexInfo::operator>=(const IndexInfo& in) const
+    {
+	return mPtrNum >= in.mPtrNum;
+    }
+
+    
     const IndexInfo* IndexInfo::getPtr(size_t inum) const
     {
 	return &mNext[inum];
@@ -18,10 +50,15 @@ namespace MultiArrayTools
     {
 	return mDim;
     }
+
+    size_t IndexInfo::max() const
+    {
+	return mMax;
+    }
     
     size_t IndexInfo::getStepSize(size_t inum) const
     {
-	return mNext[inum]->getStepSzize();
+	return mNext[inum].getStepSize();
     }
     
     size_t IndexInfo::getStepSize() const
@@ -29,5 +66,9 @@ namespace MultiArrayTools
 	return mStepSize;
     }
 
+    IndexType IndexInfo::type() const
+    {
+	return mType;
+    }
     
 } // end namespace MultiArrayTools
diff --git a/src/ranges/index_info.h b/src/ranges/index_info.h
index 427aedd..d58230d 100644
--- a/src/ranges/index_info.h
+++ b/src/ranges/index_info.h
@@ -4,7 +4,11 @@
 #define __index_info_h__
 
 #include <cstdlib>
+#include <cstdint>
 #include <vector>
+#include <memory>
+#include "vindex_base.h"
+#include "index_type.h"
 
 namespace MultiArrayTools
 {
@@ -13,29 +17,51 @@ namespace MultiArrayTools
     class IndexInfo
     {
     public:
-	IndexInfo() = delete;
 
+	IndexInfo(IndexInfo&& in) = default;
+	IndexInfo& operator=(IndexInfo&& in) = default;
+	IndexInfo(const IndexInfo& in) = default;
+	IndexInfo& operator=(const IndexInfo& in) = default;
+
+	
 	template <class IndexClass>
 	IndexInfo(const IndexClass& ind, size_t stepSize = 1);
+
+	bool operator==(const IndexInfo& in) const;
+	bool operator!=(const IndexInfo& in) const;
+
+	bool operator<=(const IndexInfo& in) const;
+	bool operator<(const IndexInfo& in) const;
+	bool operator>(const IndexInfo& in) const;
+	bool operator>=(const IndexInfo& in) const;
+
 	
 	const IndexInfo* getPtr(size_t inum) const;
 	std::intptr_t getPtrNum() const;
 	size_t dim() const;
+	size_t max() const;
 	size_t getStepSize(size_t inum) const;
 	size_t getStepSize() const;
-
+	IndexType type() const;
+	
     private:
+
+	IndexInfo() = default;
+	
 	std::vector<IndexInfo> mNext;
 	std::intptr_t mPtrNum;
 	size_t mDim;
+	size_t mMax;
 	size_t mStepSize;
+	IndexType mType;
     };
 
     template <class IndexClass>
     IndexInfo::IndexInfo(const IndexClass& ind, size_t stepSize) :
 	mNext(ind.infoVec()),
 	mPtrNum( reinterpret_cast<std::intptr_t>( &ind ) ),
-	mDim(ind.rangePtr()->dim()),
+	mDim(ind.vrange()->dim()),
+	mMax(ind.max()),
 	mStepSize(stepSize)
     {}
     
diff --git a/src/ranges/vindex_base.h b/src/ranges/vindex_base.h
index cc971cf..114d2e1 100644
--- a/src/ranges/vindex_base.h
+++ b/src/ranges/vindex_base.h
@@ -4,6 +4,7 @@
 
 //#include "ranges/range_base.h"
 #include "ranges/index_type.h"
+#include "base_def.h"
 
 namespace MultiArrayTools
 {