diff --git a/src/include/dynamic_operation.cc.h b/src/include/dynamic_operation.cc.h
new file mode 100644
index 0000000..b2353a5
--- /dev/null
+++ b/src/include/dynamic_operation.cc.h
@@ -0,0 +1,37 @@
+
+#include "dynamic_operation.h"
+
+namespace MultiArrayTools
+{
+    template <typename T, class Operation>
+    const T& DynamicOperation<T,Operation>::get(const DExt& pos) const
+    {
+	return mOp.get(pos.expl<ET>());
+    }
+    
+    template <typename T, class Operation>
+    DynamicOperationBase& DynamicOperation<T,Operation>::set(const DExt& pos)
+    {
+	mOp.set(pos.expl<ET>());
+	return *this;
+    }
+    
+    template <typename T, class Operation>
+    DExt DynamicOperation<T,Operation>::rootSteps(std::intptr_t iPtrNum = 0) const
+    {
+	return mOp.rootSteps(iPtrNum);
+    }
+    
+    template <typename T, class Operation>
+    DynamicExpression DynamicOperation<T,Operation>::loop(const DynamicExpression& exp) const
+    {
+	return mOp.loop(exp);
+    }
+    
+    template <typename T, class Operation>
+    const T* DynamicOperation<T,Operation>::data() const
+    {
+	return mOp.data();
+    }
+
+} // namespace MultiArrayTools
diff --git a/src/include/dynamic_operation.h b/src/include/dynamic_operation.h
new file mode 100644
index 0000000..f8cab39
--- /dev/null
+++ b/src/include/dynamic_operation.h
@@ -0,0 +1,60 @@
+
+#ifndef __dynamic_operation_h__
+#define __dynamic_operation_h__
+
+#include "base_def.h"
+#include "multi_array_operation.h"
+
+namespace MultiArrayTools
+{
+
+    template <typename T>
+    class DynamicOperationBase : public OperationTemplate<T,DynamicOperationBase<T>>
+    {
+    public:
+	typedef T value_type;
+	typedef OperationBase<T,DynamicOperationBase<T>> OT;
+	
+	static constexpr size_t SIZE = 1;
+	static constexpr bool CONT = true;
+	
+	DynamicOperationBase() = default;
+	DynamicOperationBase(const DynamicOperationBase& in) = default;
+	DynamicOperationBase(DynamicOperationBase&& in) = default;
+	DynamicOperationBase& operator=(const DynamicOperationBase& in) = default;
+	DynamicOperationBase& operator=(DynamicOperationBase&& in) = default;
+
+	virtual const T& get(const DExt& pos) const = 0;
+	virtual DynamicOperationBase& set(const DExt& pos) = 0;
+	virtual DExt rootSteps(std::intptr_t iPtrNum = 0) const = 0;
+	virtual DynamicExpression loop(const DynamicExpression& exp) const = 0;
+	virtual const T* data() const = 0;
+	
+    };
+
+    template <typename T, class Operation>
+    class DynamicOperation : public DynamicOperationBase<T>
+    {
+    private:
+	Operation mOp;
+    public:
+	typedef decltype(std::declval<Operation>().rootSteps()) ET;
+	
+	DynamicOperation() = default;
+	DynamicOperation(const DynamicOperation& in) = default;
+	DynamicOperation(DynamicOperation&& in) = default;
+	DynamicOperation& operator=(const DynamicOperation& in) = default;
+	DynamicOperation& operator=(DynamicOperation&& in) = default;
+
+	DynamicOperation(const Operation& op) : mOp(op) {}
+
+	virtual const T& get(const DExt& pos) const override final;
+	virtual DynamicOperationBase& set(const DExt& pos) override final;
+	virtual DExt rootSteps(std::intptr_t iPtrNum = 0) const override final;
+	virtual DynamicExpression loop(const DynamicExpression& exp) const override final;
+	virtual const T* data() const override final;
+    };
+    
+} // namespace MultiArrayTools
+
+#endif
diff --git a/src/include/operation_helper.h b/src/include/operation_helper.h
new file mode 100644
index 0000000..4b4b002
--- /dev/null
+++ b/src/include/operation_helper.h
@@ -0,0 +1,46 @@
+
+#ifndef __operation_helper_h__
+#define __operation_helper_h__
+
+#include "multi_array_operation.h"
+
+namespace MultiArrayTools
+{
+
+    template <class BaseArray, class... Ranges>
+    class PseudoArray
+    {
+	size_t mThreadNum;
+	Slice<> mSl;
+	mutable ConstOperationRoot<T,Range> mOp;
+	
+    public:
+
+	template <class ET>
+	const SrcHolder<ConstOperationRoot<T,Range>> operator[](ET pos) const;
+    };
+    
+    template <class Operation>
+    class SrcHolder
+    {
+
+	TempHolder operator+(SrcHolder in) const;
+	// aso
+    };
+
+    template <class Operation>
+    class TempHolder
+    {
+	TempHolder operator+(SrcHolder in) const;
+	TempHolder operator+(TempHolder in) const;
+    };
+
+    template <class Operation>
+    class TarHolder
+    {
+	TarHolder& operator=(TempHolder in);
+    };
+    
+} // namespace MultiArrayTools
+
+#endif
diff --git a/src/include/xfor/xfor.h b/src/include/xfor/xfor.h
index 2689ca3..d4fb92f 100644
--- a/src/include/xfor/xfor.h
+++ b/src/include/xfor/xfor.h
@@ -36,6 +36,9 @@ namespace MultiArrayHelper
         //virtual size_t rootSteps() const = 0;
         virtual std::shared_ptr<ExtBase> operator+(const ExtBase& in) const = 0;
         virtual std::shared_ptr<ExtBase> operator*(size_t in) const = 0;
+
+	template <class ExtType>
+	const ExtType& expl() const { return dynamic_cast<const ExtT<ExtType>*>(this)->ext(); }
     };
 
     typedef std::shared_ptr<ExtBase> DExt;
@@ -444,6 +447,11 @@ namespace MultiArrayHelper
 
 namespace MultiArrayHelper
 {
+    template <class ExtType>
+    const ExtType& ExtBase::expl() const
+    {
+	return dynamic_cast<const ExtT<ExtType>*>(this)->ext();
+    }
     
     /*****************
      *     F o r     *