diff --git a/src/base_def.h b/src/base_def.h
index 56d9d71..efd7184 100644
--- a/src/base_def.h
+++ b/src/base_def.h
@@ -28,6 +28,18 @@
 
 namespace MultiArrayTools
 {
+    template <class MultiArray>
+    void checkPtr(const MultiArray& in, bool check = false)
+    {
+	static MultiArray const* ptr = nullptr;
+	if(not check){
+	    ptr = &in;
+	}
+	else {
+	    assert(ptr == &in);
+	}
+    }
+
     /***********************
      *  Provided Types     *
      ***********************/
@@ -81,9 +93,17 @@ namespace MultiArrayTools
     template <typename T>
     class MultiArrayOperationBase;
 
+    // multi_array_operation.h
+    template <typename T>
+    class MutableMultiArrayOperationBase;
+
     // multi_array_operation.h
     template <typename T, class Range>
     class MultiArrayOperationRoot;
+
+    // multi_array_operation.h
+    template <typename T, class Range>
+    class ConstMultiArrayOperationRoot;
     
     // multi_array_operation.h
     template <typename T, class Operation, class... MAOps>
diff --git a/src/index_base.cc b/src/index_base.cc
index eaf240d..66b8f1e 100644
--- a/src/index_base.cc
+++ b/src/index_base.cc
@@ -83,6 +83,7 @@ namespace MultiArrayTools
 
     void IndefinitIndexBase::setPos(size_t pos)
     {
+	//CHECK;
 	//assert(not virt());
 	mPos = pos;
 	if(linked()){
diff --git a/src/multi_array.cc b/src/multi_array.cc
index 15b2f50..2021591 100644
--- a/src/multi_array.cc
+++ b/src/multi_array.cc
@@ -20,7 +20,10 @@ namespace MultiArrayTools
     template <typename T, class Range>
     auto MultiArrayBase<T,Range>::begin() const -> decltype(Range().begin())
     {
-	return mRange->begin();
+	//VCHECK(not mRange);
+	auto i = mRange->begin();
+	//CHECK;
+	return i;
     }
 
     template <typename T, class Range>
@@ -46,6 +49,7 @@ namespace MultiArrayTools
     template <class NameType>
     MultiArrayOperationRoot<T,Range> MultiArrayBase<T,Range>::operator()(const NameType& name, bool master)
     {
+	//CHECK;
 	if(master){
 	    return MultiArrayOperationRoot<T,Range>(*this, name);
 	}
@@ -54,6 +58,26 @@ namespace MultiArrayTools
 	}
     }
 
+    template <typename T, class Range>
+    template <class... NameTypes>
+    ConstMultiArrayOperationRoot<T,Range> MultiArrayBase<T,Range>::operator()(const NameTypes&... str) const
+    {
+	return MultiArrayOperationRoot<T,Range>(*this, Name("master", str...));
+    }
+
+    template <typename T, class Range>
+    template <class NameType>
+    ConstMultiArrayOperationRoot<T,Range> MultiArrayBase<T,Range>::operator()(const NameType& name, bool master) const
+    {
+	//CHECK;
+	if(master){
+	    return ConstMultiArrayOperationRoot<T,Range>(*this, name);
+	}
+	else {
+	    return operator()(name);
+	}
+    }
+
     template <typename T, class Range>
     bool MultiArrayBase<T,Range>::isInit() const
     {
diff --git a/src/multi_array.h b/src/multi_array.h
index 6ea374d..25fec77 100644
--- a/src/multi_array.h
+++ b/src/multi_array.h
@@ -44,6 +44,12 @@ namespace MultiArrayTools
 	template <class NameType>
 	MultiArrayOperationRoot<T,Range> operator()(const NameType& name, bool master);
 
+	template <class... NameTypes>
+	ConstMultiArrayOperationRoot<T,Range> operator()(const NameTypes&... str) const;
+
+	template <class NameType>
+	ConstMultiArrayOperationRoot<T,Range> operator()(const NameType& name, bool master) const;
+
 	virtual bool isInit() const;
 	
     protected:
diff --git a/src/multi_array_operation.cc b/src/multi_array_operation.cc
index 21043e3..da34107 100644
--- a/src/multi_array_operation.cc
+++ b/src/multi_array_operation.cc
@@ -20,6 +20,12 @@ namespace MultiArrayTools
     {
 	return *mIibPtr;
     }
+
+    template <typename T>
+    void MultiArrayOperationBase<T>::freeIndex()
+    {
+	mIibPtr->freeLinked();
+    }
     
     /*********************************
      *   MultiArrayOperationBase     *
@@ -28,12 +34,18 @@ namespace MultiArrayTools
     template <typename T, class Range>
     void MultiArrayOperationRoot<T,Range>::performAssignment(const MultiArrayOperationBase<T>& in)
     {
+	//CHECK;
 	in.linkIndicesTo(MAOB::mIibPtr);
+	//CHECK;
 	IndexType& iref = dynamic_cast<IndexType&>(*MAOB::mIibPtr);
+	//CHECK;
+	const size_t endPos = mArrayRef.end().pos();
+	std::cout << "assignment: " << endPos << "elements" << std::endl;
 	for(iref = mArrayRef.begin().pos(); iref != mArrayRef.end(); ++iref){
-	    // build in vectorization later
+	    std::cout << iref.pos() << '\r' << std::flush;
 	    get() = in.get();
 	}
+	//CHECK;
 	MAOB::mIibPtr->freeLinked();
     }
 
@@ -64,7 +76,7 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>::
     MultiArrayOperationRoot(MultiArrayBase<T,Range>& ma,
 			    const Name& nm) :
-	MultiArrayOperationBase<T>(),
+	MutableMultiArrayOperationBase<T>(),
 	mArrayRef(ma),
 	mIndex(mArrayRef.begin()),
 	mNm(nm)
@@ -86,6 +98,7 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(MultiArrayOperationRoot<T,Range>& in)
     {
+	//CHECK;
 	maketurnSlice(in);
 	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
 	    return makeSlice(in);
@@ -99,6 +112,7 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(MultiArrayOperationRoot<T,Range2>& in)
     {
+	//CHECK;
 	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
 	    return makeSlice(in);
 	}
@@ -111,7 +125,9 @@ namespace MultiArrayTools
     const MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(const MultiArrayOperationRoot<T,Range2>& in)
     {
+	//CHECK;
 	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
+	    //CHECK;
 	    return makeConstSlice(in);
 	}
 	performAssignment(in);
@@ -123,6 +139,7 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(const MultiArrayOperation<T,Operation,MAOps...>& in)
     {
+	//CHECK;
 	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
 	    // NO SLICE CREATION !!! (total array not initialized!!)
 	    // throw !
@@ -132,19 +149,12 @@ namespace MultiArrayTools
 	return *this;
     }
 
-    /*    template <typename T, class Range>
-    template <class Operation, class... MAOps>
-    MultiArrayOperation<T,Operation,MultiArrayOperationRoot<T,Range>, MAOps...>
-    MultiArrayOperationRoot<T,Range>::operator()(Operation& op, const MAOps&... secs) const
-    {
-	return MultiArrayOperation<T,Operation,MultiArrayOperationRoot<T,Range>, MAOps...>(op, *this, secs...);
-	}*/
-
     template <typename T, class Range>
     template <class Operation, class... MAOps>
     MultiArrayOperation<T,Operation,MultiArrayOperationRoot<T,Range>, MAOps...>
     MultiArrayOperationRoot<T,Range>::operator()(const Operation& op, const MAOps&... secs) const
     {
+	//CHECK;
 	return MultiArrayOperation<T,Operation,MultiArrayOperationRoot<T,Range>, MAOps...>(op, *this, secs...);
     }
 
@@ -177,12 +187,14 @@ namespace MultiArrayTools
     auto MultiArrayOperationRoot<T,Range>::operator/(const MAOp& sec)
 	-> decltype(operator()(std::divides<T>(), sec))
     {
+	//CHECK;
 	return operator()(std::divides<T>(), sec);
     }
 
     template <typename T, class Range>
     MultiArrayOperationRoot<T,Range> MultiArrayOperationRoot<T,Range>::copyThis()
     {
+	//CHECK;
 	return MultiArrayOperationRoot<T,Range>(mArrayRef, mNm);
     }
     
@@ -215,6 +227,7 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator/=(const MAOp& sec)
     {
+	//CHECK;
 	return (*this) = copyThis() / sec;
     }
 
@@ -275,6 +288,188 @@ namespace MultiArrayTools
 	mIndex.copyPos(ind);
 	return *this;
     }
+
+    template <typename T, class Range>
+    void MultiArrayOperationRoot<T,Range>::freeIndex()
+    {
+	MAOB::mIibPtr->freeLinked();
+	mIndex = mArrayRef.begin();
+	MAOB::mIibPtr = &mIndex;
+	MAOB::mIibPtr->name(mNm);
+    }
+
+    /**************************************
+     *   ConstMultiArrayOperationBase     *
+     **************************************/
+    
+    template <typename T, class Range>
+    template <class RangeX>
+    const ConstMultiArrayOperationRoot<T,Range>&
+    ConstMultiArrayOperationRoot<T,Range>::makeConstSlice(const ConstMultiArrayOperationRoot<T,RangeX>& in) const
+    {
+	ConstSlice<T,Range,RangeX>& sl = dynamic_cast<ConstSlice<T,Range,RangeX>&>( mArrayRef );
+	sl.set(in.mArrayRef, name(), dynamic_cast<const typename RangeX::IndexType&>( in.index() ), in.name());
+	return *this;
+    }
+
+    
+    // CONST SLICE !!!!!
+    
+    template <typename T, class Range>
+    ConstMultiArrayOperationRoot<T,Range>::
+    ConstMultiArrayOperationRoot(const MultiArrayBase<T,Range>& ma,
+				 const Name& nm) :
+	MultiArrayOperationBase<T>(),
+	mArrayRef(ma),
+	mIndex(mArrayRef.begin()),
+	mNm(nm)
+    {
+	MAOB::mIibPtr = &mIndex;
+	MAOB::mIibPtr->name(nm);
+	//mIndex.name(nm);
+    }
+
+    template <typename T, class Range>
+    ConstMultiArrayOperationRoot<T,Range>::
+    ConstMultiArrayOperationRoot(const MultiArrayOperationRoot<T,Range>& in) :
+	MultiArrayOperationBase<T>(),
+	mArrayRef(in.getCont()),
+	mIndex(mArrayRef.begin()),
+	mNm(in.name())
+    {
+	MAOB::mIibPtr = &mIndex;
+	MAOB::mIibPtr->name(mNm);
+	//mIndex.name(nm);
+    }
+	
+    template <typename T, class Range>
+    const ConstMultiArrayOperationRoot<T,Range>&
+    ConstMultiArrayOperationRoot<T,Range>::operator=(const ConstMultiArrayOperationRoot<T,Range>& in)
+    {
+	//CHECK;
+	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
+	    return makeConstSlice(in);
+	}
+	assert(0);
+	return *this;
+    }
+
+    template <typename T, class Range>
+    template <class Range2>
+    const ConstMultiArrayOperationRoot<T,Range>&
+    ConstMultiArrayOperationRoot<T,Range>::operator=(const ConstMultiArrayOperationRoot<T,Range2>& in)
+    {
+	//CHECK;
+	if(mArrayRef.isSlice() and not mArrayRef.isInit()){
+	    //CHECK;
+	    return makeConstSlice(in);
+	}
+	assert(0);
+	return *this;
+    }
+
+    template <typename T, class Range>
+    template <class Operation, class... MAOps>
+    MultiArrayOperation<T,Operation,ConstMultiArrayOperationRoot<T,Range>, MAOps...>
+    ConstMultiArrayOperationRoot<T,Range>::operator()(const Operation& op, const MAOps&... secs) const
+    {
+	//CHECK;
+	return MultiArrayOperation<T,Operation,ConstMultiArrayOperationRoot<T,Range>, MAOps...>(op, *this, secs...);
+    }
+
+    template <typename T, class Range>
+    template <class MAOp>
+    auto ConstMultiArrayOperationRoot<T,Range>::operator+(const MAOp& sec) const
+	-> decltype(operator()(std::plus<T>(), sec))
+    {
+	return operator()(std::plus<T>(), sec);
+    }
+
+    template <typename T, class Range>
+    template <class MAOp>
+    auto ConstMultiArrayOperationRoot<T,Range>::operator-(const MAOp& sec) const
+	-> decltype(operator()(std::minus<T>(), sec))
+    {
+	return operator()(std::minus<T>(), sec);
+    }
+
+    template <typename T, class Range>
+    template <class MAOp>
+    auto ConstMultiArrayOperationRoot<T,Range>::operator*(const MAOp& sec) const
+	-> decltype(operator()(std::multiplies<T>(), sec))
+    {
+	return operator()(std::multiplies<T>(), sec);
+    }
+
+    template <typename T, class Range>
+    template <class MAOp>
+    auto ConstMultiArrayOperationRoot<T,Range>::operator/(const MAOp& sec) const
+	-> decltype(operator()(std::divides<T>(), sec))
+    {
+	//CHECK;
+	return operator()(std::divides<T>(), sec);
+    }
+
+    template <typename T, class Range>
+    ConstMultiArrayOperationRoot<T,Range> ConstMultiArrayOperationRoot<T,Range>::copyThis() const
+    {
+	//CHECK;
+	return ConstMultiArrayOperationRoot<T,Range>(mArrayRef, mNm);
+    }
+    
+    template <typename T, class Range>
+    const MultiArrayBase<T,Range>& ConstMultiArrayOperationRoot<T,Range>::operator*() const
+    {
+	return mArrayRef;
+    }
+
+    template <typename T, class Range>
+    MultiArrayBase<T,Range> const* ConstMultiArrayOperationRoot<T,Range>::operator->() const
+    {
+	return &mArrayRef;
+    }
+    
+    template <typename T, class Range>
+    size_t ConstMultiArrayOperationRoot<T,Range>::argNum() const
+    {
+	return 1;
+    }
+
+    template <typename T, class Range>
+    void ConstMultiArrayOperationRoot<T,Range>::linkIndicesTo(IndefinitIndexBase* target) const
+    {
+	MAOB::mIibPtr->linkTo(target);
+    }
+
+    template <typename T, class Range>
+    const T& ConstMultiArrayOperationRoot<T,Range>::get() const
+    {
+	//return mArrayRef[mIndex];
+	return mArrayRef[*dynamic_cast<IndexType*>(MAOB::mIibPtr)];
+    }
+
+    template <typename T, class Range>
+    const Name& ConstMultiArrayOperationRoot<T,Range>::name() const
+    {
+	return mNm;
+    }
+
+    template <typename T, class Range>
+    const ConstMultiArrayOperationRoot<T,Range>& ConstMultiArrayOperationRoot<T,Range>::operator[](const IndexType& ind) const
+    {
+	mIndex.copyPos(ind);
+	return *this;
+    }
+
+    template <typename T, class Range>
+    void ConstMultiArrayOperationRoot<T,Range>::freeIndex()
+    {
+	MAOB::mIibPtr->freeLinked();
+	mIndex = mArrayRef.begin();
+	MAOB::mIibPtr = &mIndex;
+	MAOB::mIibPtr->name(mNm);
+    }
+
     
     /*****************************
      *   MultiArrayOperation     *
@@ -410,14 +605,15 @@ namespace MultiArrayTools
     {
 	TupleIndicesLinker<sizeof...(MAOps)-1>::linkTupleIndicesTo(mArgs, target);
     }
-    
+
+    /*
     template <typename T, class Operation, class... MAOps>    
     T& MultiArrayOperation<T,Operation,MAOps...>::get()
     {
 	mVal = OperationCall<sizeof...(MAOps)-1>::
 	    template callOperation(mOp, mArgs);
 	return mVal;
-    }
+	}*/
 
     template <typename T, class Operation, class... MAOps>    
     const T& MultiArrayOperation<T,Operation,MAOps...>::get() const
diff --git a/src/multi_array_operation.h b/src/multi_array_operation.h
index fa3f988..8967ef9 100644
--- a/src/multi_array_operation.h
+++ b/src/multi_array_operation.h
@@ -17,22 +17,33 @@ namespace MultiArrayTools
     {
     public:
 
-	MultiArrayOperationBase() = default;
+	MultiArrayOperationBase() /*{ CHECK; }*/ = default;
 	virtual ~MultiArrayOperationBase();
 
 	virtual size_t argNum() const = 0;
 	const IndefinitIndexBase& index() const;
 	virtual void linkIndicesTo(IndefinitIndexBase* target) const = 0;
 	
-	virtual T& get() = 0;
 	virtual const T& get() const = 0;
 
+	virtual void freeIndex();
+	
     protected:
 	IndefinitIndexBase* mIibPtr = nullptr;
     };
     
+    
+    template <typename T>
+    class MutableMultiArrayOperationBase : public MultiArrayOperationBase<T>
+    {
+    public:
+
+	MutableMultiArrayOperationBase() /*{ CHECK; }*/ = default;
+	virtual T& get() = 0;
+    };
+    
     template <typename T, class Range>
-    class MultiArrayOperationRoot : public MultiArrayOperationBase<T>
+    class MultiArrayOperationRoot : public MutableMultiArrayOperationBase<T>
     {
     public:
 
@@ -89,6 +100,7 @@ namespace MultiArrayTools
 	MultiArrayOperationRoot& operator/=(const MAOp& sec);
 
 	const MultiArrayBase<T,Range>& operator*() const;
+	//MultiArrayBase<T,Range>& operator*();
 	MultiArrayBase<T,Range> const* operator->() const;
 	
 	virtual size_t argNum() const override;
@@ -104,6 +116,10 @@ namespace MultiArrayTools
 
 	const Name& name() const;
 
+	virtual void freeIndex() override;
+
+	const MultiArrayBase<T,Range>& getCont() const { return mArrayRef; }
+	
 	template <typename U, class RangeX>
 	friend class MultiArrayOperationRoot;
 	
@@ -121,6 +137,77 @@ namespace MultiArrayTools
 	mutable IndexType mIndex;
 	Name mNm;
     };
+    
+    template <typename T, class Range>
+    class ConstMultiArrayOperationRoot : public MultiArrayOperationBase<T>
+    {
+    public:
+
+	typedef MultiArrayOperationBase<T> MAOB;
+	typedef typename Range::IndexType IndexType;
+	//typedef decltype(MultiArray<T,Range>().begin()) IndexType;
+
+	ConstMultiArrayOperationRoot(const MultiArrayBase<T,Range>& ma, const Name& nm);
+	ConstMultiArrayOperationRoot(const MultiArrayOperationRoot<T,Range>& in);
+	
+	const ConstMultiArrayOperationRoot& operator=(const ConstMultiArrayOperationRoot& in);
+
+	template <class Range2>
+	const ConstMultiArrayOperationRoot& operator=(const ConstMultiArrayOperationRoot<T,Range2>& in);
+	
+	//template <class Operation, class... MAOps>
+	//MultiArrayOperation<T,Operation,MultiArrayOperationRoot<T,Range>, MAOps...>
+	//operator()(Operation& op, const MAOps&... secs) const;
+
+	template <class Operation, class... MAOps>
+	MultiArrayOperation<T,Operation,ConstMultiArrayOperationRoot<T,Range>, MAOps...>
+	operator()(const Operation& op, const MAOps&... secs) const;
+	
+	template <class MAOp>
+	auto operator+(const MAOp& sec) const -> decltype(operator()(std::plus<T>(), sec));
+
+	template <class MAOp>
+	auto operator-(const MAOp& sec) const -> decltype(operator()(std::minus<T>(), sec));
+
+	template <class MAOp>
+	auto operator*(const MAOp& sec) const -> decltype(operator()(std::multiplies<T>(), sec));
+
+	template <class MAOp>
+	auto operator/(const MAOp& sec) const -> decltype(operator()(std::divides<T>(), sec));
+	
+	ConstMultiArrayOperationRoot copyThis() const;
+	
+	const MultiArrayBase<T,Range>& operator*() const;
+	//MultiArrayBase<T,Range>& operator*();
+	MultiArrayBase<T,Range> const* operator->() const;
+	
+	virtual size_t argNum() const override;
+
+	// set index -> implement !!!!!
+	const ConstMultiArrayOperationRoot<T,Range>& operator[](const IndexType& ind) const;
+	
+	virtual void linkIndicesTo(IndefinitIndexBase* target) const override;
+
+	virtual const T& get() const override;
+
+	const Name& name() const;
+
+	virtual void freeIndex() override;
+
+	const MultiArrayBase<T,Range>& getCont() const { return mArrayRef; }
+	
+	template <typename U, class RangeX>
+	friend class MultiArrayOperationRoot;
+	
+    protected:
+
+	template <class RangeX>
+	const ConstMultiArrayOperationRoot& makeConstSlice(const ConstMultiArrayOperationRoot<T,RangeX>& in) const;
+	
+	MultiArrayBase<T,Range> const& mArrayRef;
+	mutable IndexType mIndex;
+	Name mNm;
+    };
 
     template <typename T, class Operation, class... MAOps>
     class MultiArrayOperation : public MultiArrayOperationBase<T>
@@ -157,7 +244,7 @@ namespace MultiArrayTools
 	
 	virtual void linkIndicesTo(IndefinitIndexBase* target) const override;
 
-	virtual T& get() override;
+	//virtual T& get() override;
 	virtual const T& get() const override;
 
     protected:
diff --git a/src/multi_range.cc b/src/multi_range.cc
index 334891b..d89a655 100644
--- a/src/multi_range.cc
+++ b/src/multi_range.cc
@@ -585,12 +585,15 @@ namespace MultiArrayTools
 	if(name == IIB::mName){
 	    return this;
 	}
+	
 	for(size_t i = 0; i != sizeof...(Indices); ++i){
 	    IndefinitIndexBase* iibPtr = get(i).getLinked(name);
 	    if(iibPtr != nullptr){
+		//CHECK;
 		return iibPtr;
 	    }
 	}
+	//CHECK;
 	return nullptr;
     }
 
diff --git a/src/single_range.cc b/src/single_range.cc
index f6b5d71..bbe203c 100644
--- a/src/single_range.cc
+++ b/src/single_range.cc
@@ -194,7 +194,7 @@ namespace MultiArrayTools
 	#ifdef LORENTZ_DIMENSION
 	return LORENTZ_DIMENSION;
 	#else
-	return 4;
+	return 1; // 4
 	#endif
     }
 
@@ -327,6 +327,8 @@ namespace MultiArrayTools
     template <typename U, RangeType TYPE>
     IndefinitIndexBase* SingleIndex<U,TYPE>::getLinked(const std::string& name)
     {
+	//VCHECK(name);
+	//VCHECK(IIB::mName);
 	if(name == IIB::mName){
 	    return this;
 	}
diff --git a/src/slice.cc b/src/slice.cc
index 7d7ac40..2e17a66 100644
--- a/src/slice.cc
+++ b/src/slice.cc
@@ -104,4 +104,14 @@ namespace MultiArrayTools
 	//mOwnIdx = i.pos();
 	return (*mMultiArrayPtr)[ mMAIdx ];
     }
+
+    
+    template <typename T, class Range, class MARange>
+    T& ConstSlice<T,Range,MARange>::operator[](const typename Range::IndexType& i)
+    {
+	assert(0);
+	mOwnIdx.copyPos(i);
+	//mOwnIdx = i.pos();
+	return x;
+    }
 }
diff --git a/src/slice.h b/src/slice.h
index 09c66f8..a9ff66e 100644
--- a/src/slice.h
+++ b/src/slice.h
@@ -55,6 +55,7 @@ namespace MultiArrayTools
 
 	ConstSlice(const Range& range);
 
+	virtual T& operator[](const typename Range::IndexType& i) override;
 	virtual const T& operator[](const typename Range::IndexType& i) const override;
 	
 	//Slice& setSlicePos(const Index& slicePos);
@@ -71,6 +72,9 @@ namespace MultiArrayTools
 		 const Name& MANm); 
 	
     private:
+
+	// !!!
+	T x = static_cast<T>(0);
 	
 	MultiArrayBase<T,MARange> const* mMultiArrayPtr = nullptr;
 	mutable typename Range::IndexType mOwnIdx;