diff --git a/src/block.cc b/src/block.cc
index a06bbd0..03d045e 100644
--- a/src/block.cc
+++ b/src/block.cc
@@ -26,11 +26,35 @@ namespace MultiArrayHelper
 	OpFunction f;
 	BlockResult<T> res(mSize);
 	for(size_t i = 0; i != mSize; ++i){
-	    res[i] = f(this->operator[](i), in[i]);
+	    res[i] = f((*this)[i], in[i]);
 	}
 	return res;
     }
 
+    template <typename T>
+    BlockResult<T> BlockBase<T>::operator+(const BlockBase& in)
+    {
+	return operate<std::plus<T> >(in);
+    }
+
+    template <typename T>
+    BlockResult<T> BlockBase<T>::operator-(const BlockBase& in)
+    {
+	return operate<std::minus<T> >(in);
+    }
+    
+    template <typename T>
+    BlockResult<T> BlockBase<T>::operator*(const BlockBase& in)
+    {
+	return operate<std::multiplies<T> >(in);
+    }
+    
+    template <typename T>
+    BlockResult<T> BlockBase<T>::operator/(const BlockBase& in)
+    {
+	return operate<std::divides<T> >(in);
+    }
+    
     /*************
      *   Block   *
      *************/
@@ -52,6 +76,13 @@ namespace MultiArrayHelper
     {
 	return *(mBegPtr + i);
     }
+
+    template <typename T>
+    Block<T>& Block<T>::set(const T* nbeg)
+    {
+	mBegPtr = nbeg;
+	return *this;
+    }
     
     /******************
      *   BlockValue   *
@@ -73,26 +104,42 @@ namespace MultiArrayHelper
     {
 	return mVal;
     }
-    
+
+    template <typename T>
+    BlockValue<T>& BlockValue<T>::set(const T* nbeg)
+    {
+	mVal = *nbeg;
+	return *this;
+    }
+
     /******************
      *   SplitBlock   *
      ******************/
 
     template <typename T>
-    SplitBlock<T>::SplitBlock(std::vector<T*>&& begPtrVec) :
-	BlockBase<T>(begPtrVec.size()),
-	mBegPtr(begPtrVec) {}
+    SplitBlock<T>::SplitBlock(const std::vector<T>& data, size_t begPos,
+			      size_t stepSize, size_t size) :
+	BlockBase<T>(size),
+	mStepSize(stepSize),
+	mBegPtr(data.data() + begPos) {}
 
     template <typename T>
     BlockType SplitBlock<T>::type() const
     {
 	return BlockType::SPLIT;
     }
+
+    template <typename T>
+    const T& SplitBlock<T>::operator[](size_t pos) const
+    {
+	return *(mBegPtr + pos*mStepSize);
+    }	
     
     template <typename T>
-    const T& SplitBlock<T>::operator[](size_t i) const
+    SplitBlock<T>& SplitBlock<T>::set(const T* nbeg)
     {
-	return *(mBegPtrVec[i]);
+	mBegPtr = nbeg;
+	return *this;
     }
     
     /*******************
@@ -122,6 +169,10 @@ namespace MultiArrayHelper
 	return mRes[i];
     }
 
-
+    template <typename T>
+    BlockResult<T>& BlockResult<T>::set(const T* nbeg)
+    {
+	return *this;
+    }
     
 } // end namespace MultiArrayHelper
diff --git a/src/block.h b/src/block.h
index fddf7e3..df7a324 100644
--- a/src/block.h
+++ b/src/block.h
@@ -16,7 +16,7 @@ namespace MultiArrayHelper
 	BLOCK = 1,
 	VALUE = 2,
 	SPLIT = 3,
-	RESULT = 4	
+	RESULT = 4,
     };
     
     // manage vectorization in the future !!
@@ -33,8 +33,15 @@ namespace MultiArrayHelper
 	virtual size_t size() const;
 	virtual const T& operator[](size_t pos) const = 0;
 
+	virtual BlockBase& set(const T* nbeg) = 0;
+	
 	template <class OpFunction>
 	BlockResult<T> operate(const BlockBase& in);
+
+	BlockResult<T> operator+(const BlockBase& in);
+	BlockResult<T> operator-(const BlockBase& in);
+	BlockResult<T> operator*(const BlockBase& in);
+	BlockResult<T> operator/(const BlockBase& in);
 	
     protected:
 	size_t mSize;
@@ -49,9 +56,10 @@ namespace MultiArrayHelper
 
 	virtual BlockType type() const override;
 	virtual const T& operator[](size_t pos) const override;
-
+	virtual Block& set(const T* nbeg) override;
+	
     protected:
-	T* mBegPtr;
+	const T* mBegPtr;
     };
 
     template <typename T>
@@ -63,28 +71,29 @@ namespace MultiArrayHelper
 
 	virtual BlockType type() const override;
 	virtual const T& operator[](size_t pos) const override;
-
-	virtual BlockBase& set(size_t begPos) override;
+	virtual BlockValue& set(const T* nbeg) override;
 	
     protected:
 	T mVal;
     };
 
+       
     template <typename T>
     class SplitBlock : public BlockBase<T>
     {
     public:
 
 	SplitBlock() = default;
-	SplitBlock(std::vector<T*>&& begPtrVec);
+	SplitBlock(const std::vector<T>& data, size_t begPos,
+		   size_t stepSize, size_t size);
 
 	virtual BlockType type() const override;
 	virtual const T& operator[](size_t pos) const override;
-
-	virtual BlockBase& set(size_t begPos) override;
+	virtual SplitBlock& set(const T* nbeg) override;
 	
     protected:
-	std::vector<T*> mBegPtrVec;
+	size_t mStepSize;
+	const T* mBegPtr;	
     };
 
     template <typename T>
@@ -97,8 +106,7 @@ namespace MultiArrayHelper
 	virtual BlockType type() const override;
 	virtual const T& operator[](size_t pos) const override;
 	virtual T& operator[](size_t i);
-
-	virtual BlockBase& set(size_t begPos) override;
+	virtual BlockResult& set(const T* nbeg) override;
 	
     protected:
 	std::vector<T> mRes;
diff --git a/src/multi_array_operation.cc b/src/multi_array_operation.cc
index 7ca9321..a540870 100644
--- a/src/multi_array_operation.cc
+++ b/src/multi_array_operation.cc
@@ -26,33 +26,33 @@ namespace MultiArrayTools
     template <class OperationClass>
     template <class Second>
     auto OperationTemplate<OperationClass>::operator+(const Second& in) const
-	-> Operation<double,std::plus<double>,OperationClass,Second>
+	-> Operation<value_type,std::plus<value_type>,OperationClass,Second>
     {
-    	return Operation<double,std::plus<double>,OperationClass,Second>(*mOc, in);
+    	return Operation<value_type,std::plus<value_type>,OperationClass,Second>(*mOc, in);
     }
 
     template <class OperationClass>
     template <class Second>
     auto OperationTemplate<OperationClass>::operator-(const Second& in) const
-	-> Operation<double,std::minus<double>,OperationClass,Second>
+	-> Operation<value_type,std::minus<value_type>,OperationClass,Second>
     {
-    	return Operation<double,std::minus<double>,OperationClass,Second>(*mOc, in);
+    	return Operation<value_type,std::minus<value_type>,OperationClass,Second>(*mOc, in);
     }
     
     template <class OperationClass>
     template <class Second>
     auto OperationTemplate<OperationClass>::operator*(const Second& in) const
-	-> Operation<double,std::multiplies<double>,OperationClass,Second>
+	-> Operation<value_type,std::multiplies<value_type>,OperationClass,Second>
     {
-    	return Operation<double,std::multiplies<double>,OperationClass,Second>(*mOc, in);
+    	return Operation<value_type,std::multiplies<value_type>,OperationClass,Second>(*mOc, in);
     }
 
     template <class OperationClass>
     template <class Second>
     auto OperationTemplate<OperationClass>::operator/(const Second& in) const
-	-> Operation<double,std::divides<double>,OperationClass,Second>
+	-> Operation<double,std::divides<value_type>,OperationClass,Second>
     {
-    	return Operation<double,std::divides<double>,OperationClass,Second>(*mOc, in);
+    	return Operation<value_type,std::divides<value_type>,OperationClass,Second>(*mOc, in);
     }
 
     /*************************
@@ -76,13 +76,13 @@ namespace MultiArrayTools
     }
     
     template <typename T, class... Ranges>
-    BlockBase<T>& OperationMaster<T,Ranges...>::get(const IndexBase& ind)
+    BlockBase<T>& OperationMaster<T,Ranges...>::get()
     {
 	return mArrayRef.data()[ mIndex->pos() ];
     }
     
     template <typename T, class... Ranges>
-    const BlockBase<T>& OperationMaster<T,Ranges...>::get(const IndexBase& ind) const
+    const BlockBase<T>& OperationMaster<T,Ranges...>::get() const
     {
 	return mArrayRef.data()[ mIndex->pos() ];
     }
@@ -102,7 +102,7 @@ namespace MultiArrayTools
     }
 
     template <typename T, class... Ranges>
-    const BlockBase<T>& ConstOperationRoot<T,Ranges...>::get(const IndexBase& ind) const
+    const BlockBase<T>& ConstOperationRoot<T,Ranges...>::get() const
     {
 	return mArrayRef[ (*mIndex)() ];
     }
@@ -128,13 +128,13 @@ namespace MultiArrayTools
     }
     
     template <typename T, class... Ranges>
-    const BlockBase<T>& OperationRoot<T,Ranges...>::get(const IndexBase& ind) const
+    const BlockBase<T>& OperationRoot<T,Ranges...>::get() const
     {
 	return mArrayRef[ (*mIndex)() ];
     }
 
     template <typename T, class... Ranges>
-    BlockBase<T>& OperationRoot<T,Ranges...>::get(const IndexBase& ind)
+    BlockBase<T>& OperationRoot<T,Ranges...>::get()
     {
 	return mArrayRef[ (*mIndex)() ];
     }
@@ -149,7 +149,7 @@ namespace MultiArrayTools
 	mOps(ops...) {}
 
     template <typename T, class OpFunction, class... Ops>
-    const BlockBase<T>& Operation<T,OpFunction,Ops...>::get(const IndexBase& ind) const
+    const BlockBase<T>& Operation<T,OpFunction,Ops...>::get() const
     {
 	mRes = PackNum<sizeof...(Ops)-1>::template unpackArgs<T,OpFunction>(mOps);
 	return mRes;
diff --git a/src/multi_array_operation.h b/src/multi_array_operation.h
index 01b1261..ed0612d 100644
--- a/src/multi_array_operation.h
+++ b/src/multi_array_operation.h
@@ -43,7 +43,7 @@ namespace MultiArrayTools
 	virtual OperationBase& block(const std::shared_ptr<IndexBase>& blockIndex) = 0;
 	
 	//virtual size_t argNum() const = 0;
-	virtual const BlockBase<T>& get(const IndexBase& ind) const = 0;
+	virtual const BlockBase<T>& get() const = 0;
 
     protected:
  	mutable std::shared_ptr<BlockBase> mBlockPtr;
@@ -53,9 +53,10 @@ namespace MultiArrayTools
     class MutableOperationBase : public OperationBase<T>
     {
     public:
-
+	typedef T value_type;
+	
 	MutableOperationBase() = default;
-	virtual BlockBase<T>& get(const IndexBase& ind) = 0;
+	virtual BlockBase<T>& get() = 0;
     };
 
     template <class OperationClass>
@@ -63,23 +64,25 @@ namespace MultiArrayTools
     {
     public:
 
+	typedef typename OperationClass::value_type value_type;
+	
 	OperationTemplate(OperationClass* oc);
 	
 	template <class Second>
 	auto operator+(const Second& in) const
-	    -> Operation<double,std::plus<double>,OperationClass,Second>;
+	    -> Operation<value_type,std::plus<value_type>,OperationClass,Second>;
 	
 	template <class Second>
 	auto operator-(const Second& in) const
-	    -> Operation<double,std::minus<double>,OperationClass,Second>;
+	    -> Operation<value_type,std::minus<value_type>,OperationClass,Second>;
 	
 	template <class Second>
 	auto operator*(const Second& in) const
-	    -> Operation<double,std::multiplies<double>,OperationClass,Second>;
+	    -> Operation<value_type,std::multiplies<value_type>,OperationClass,Second>;
 	
 	template <class Second>
 	auto operator/(const Second& in) const
-	    -> Operation<double,std::divides<double>,OperationClass,Second>;
+	    -> Operation<value_type,std::divides<value_type>,OperationClass,Second>;
 	
     private:
 	OperationClass* mOc;
@@ -90,6 +93,7 @@ namespace MultiArrayTools
     {
     public:
 
+	typedef T value_type;
 	typedef OperationBase<T> OB;
 	typedef ContainerRange<Ranges...> CRange;
 	typedef typename MultiRange<Ranges...>::IndexType IndexType;
@@ -97,8 +101,8 @@ namespace MultiArrayTools
 	OperationMaster(MutableMultiArrayBase<T,Ranges...>& ma, const OperationBase<T>& second,
 			std::shared_ptr<typename CRange::IndexType>& index);
 		
-	virtual BlockBase<T>& get(const IndexBase& ind) override;
-	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
+	virtual BlockBase<T>& get() override;
+	virtual const BlockBase<T>& get() const override;
 
     protected:
 
@@ -114,7 +118,8 @@ namespace MultiArrayTools
 			       public OperationTemplate<ConstOperationRoot<T,Ranges...> >
     {
     public:
-	
+
+	typedef T value_type;
 	typedef OperationBase<T> OB;
 	typedef OperationTemplate<ConstOperationRoot<T,Ranges...> > OT;
 	typedef ContainerRange<Ranges...> CRange;
@@ -123,7 +128,7 @@ namespace MultiArrayTools
 	ConstOperationRoot(const MultiArrayBase<T,Ranges...>& ma,
 			   const std::shared_ptr<typename Ranges::IndexType>&... indices);
 	
-	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
+	virtual const BlockBase<T>& get() const override;
 	
     protected:
 	
@@ -136,7 +141,8 @@ namespace MultiArrayTools
 			  public OperationTemplate<OperationRoot<T,Ranges...> >
     {
     public:
-	
+
+	typedef T value_type;
 	typedef OperationBase<T> OB;
 	typedef OperationTemplate<OperationRoot<T,Ranges...> > OT;
 	typedef ContainerRange<Ranges...> CRange;
@@ -147,8 +153,8 @@ namespace MultiArrayTools
 
 	OperationMaster<T,Ranges...> operator=(const OperationBase<T>& in);
 	
-	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
-	virtual BlockBase<T>& get(const IndexBase& ind) override;
+	virtual const BlockBase<T>& get() const override;
+	virtual BlockBase<T>& get() override;
 	
     protected:
 	
@@ -161,14 +167,15 @@ namespace MultiArrayTools
 		      public OperationTemplate<Operation<T,OpFunction,Ops...> >
     {
     public:
-	
+
+	typedef T value_type;
 	typedef OperationBase<T> OB;
 	typedef OperationTemplate<Operation<T,OpFunction,Ops...> > OT;
 	typedef OpFunction F;
 	
 	Operation(const Ops&... ops);
 	
-	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
+	virtual const BlockBase<T>& get() const override;
 		
     protected:
 	std::tuple<Ops...> mOps;