diff --git a/src/include/ranges/mrange.cc.h b/src/include/ranges/mrange.cc.h
index ce7a328..cc8720e 100644
--- a/src/include/ranges/mrange.cc.h
+++ b/src/include/ranges/mrange.cc.h
@@ -81,27 +81,35 @@ namespace CNORXZ
      *   MIndex   *
      **************/
 
+    template <class... Indices>
+    MIndex<Indices...>::MIndex(const MIndex& i) :
+	IndexInterface<MIndex<Indices...>,Tuple<typename Indices::MetaType...>>(i.pos()),
+	mIPack(mkIPack(IB::mPos, Isqr<0,NI>{})),
+	mBlockSizes(mkBlockSizes(), Isqr<0,NI>{}),
+	mRange(i.range())
+    {}
+
+    template <class... Indices>
+    MIndex& MIndex<Indices...>::operator=(const MIndex& i)
+    {
+	IndexInterface<MIndex<Indices...>,Tuple<typename Indices::MetaType...>>::operator=(i);
+	mIPack = mkIPack(IB::mPos, Isqr<0,NI>{});
+	mBlockSizes(mkBlockSizes(), Isqr<0,NI>{});
+	mRange = i.range();
+	return *this;
+    }
+
     template <class... Indices>
     template <class MRange>
     MIndex<Indices...>::MIndex(const Sptr<MRange>& range, SizeT pos) :
 	IndexInterface<MIndex<Indices...>,Tuple<typename Indices::MetaType...>>(0),
 	mIPack(mkIPack(IB::mPos, Isqr<0,NI>{})),
-	mBlockSizes(mkBlockSizes(IB::mPos), Isqr<0,NI>{}),
+	mBlockSizes(mkBlockSizes(), Isqr<0,NI>{}),
 	mRange(range),
     {
 	(*this) = pos;
     }
 
-    template <class... Indices>
-    MIndex<Indices...>& MIndex<Indices...>::operator()(const Sptr<MIndex>& mi)
-    {
-	mIPack = mi.mIPack;
-	IB::mPos = iter<0,NI>
-	    ( [&](auto i) { return std::get<i>(mIPack)*std::get<i>(mBlockSizes); },
-	      [](const auto&... xs) { return (xs + ...); });
-	return *this;
-    }
-
     template <class... Indices>
     MIndex<Indices...>& MIndex<Indices...>::operator=(SizeT pos)
     {
@@ -130,6 +138,93 @@ namespace CNORXZ
 	return *this;
     }
 
+    template <class... Indices>
+    MIndex<Indices...> MIndex<Indices...>::operator+(Int n) const
+    {
+	MIndex o(*this);
+	return o += n;
+    }
+
+    template <class... Indices>
+    MIndex<Indices...> MIndex<Indices...>::operator-(Int n) const
+    {
+	MIndex o(*this);
+	return o -= n;
+    }
+
+    template <class... Indices>
+    MIndex& MIndex<Indices...>::operator+=(Int n)
+    {
+	if(-n > IB::mPos){
+	    (*this) = 0;
+	}
+	const SizeT p = IB::mPos + n;
+	if(p > max()){
+	    (*this) = max();
+	}
+	(*this) = p;
+	return *this;
+    }
+
+    template <class... Indices>
+    MIndex& MIndex<Indices...>::operator-=(Int n)
+    {
+	if(n > IB::mPos){
+	    (*this) = 0;
+	}
+	const SizeT p = IB::mPos + n;
+	if(p > max()){
+	    (*this) = max();
+	}
+	(*this) = p;
+	return *this;
+    }
+
+    template <class... Indices>
+    SizeT MIndex<Indices...>::max() const
+    {
+	return mRange->size();
+    }
+
+    template <class... Indices>
+    IndexId<0> MIndex<Indices...>::id() const
+    {
+	return IndexId<0>(this->ptrId());
+    }
+
+    template <class... Indices>
+    MetaType MIndex<Indices...>::operator*() const
+    {
+	return meta();
+    }
+    
+    template <class... Indices>
+    MetaType MIndex<Indices...>::operator->() const
+    {
+	return meta();
+    }
+
+    template <class... Indices>	
+    SizeT MIndex<Indices...>::dim() const
+    {
+	return NI;
+    }	
+
+    template <class... Indices>	
+    Sptr<RangeType> MIndex<Indices...>::range() const
+    {
+	return mRange;
+    }
+
+    template <class... Indices>	
+    template <SizeT I>
+    decltype(auto) MIndex<Indices...>::stepSize(const IndexId<I>& id) const;
+    {
+	return iter<0,NI>
+	    ( [&](auto i) { return std::get<i>(mIPack)->stepSize(id) * std::get<i>(mBlockSize); },
+	      [](const auto&... ss) { return ( ss + ... ); });
+    }
+
     template <class... Indices>
     String MIndex<Indices...>::stringMeta() const
     {
@@ -160,34 +255,35 @@ namespace CNORXZ
 	return *this;
     }
 
-    template <class... Indices>
-    SizeT MIndex<Indices...>::dim()
-    {
-	return NI;
-    }
-
-    template <class... Indices>
-    Sptr<typename MIndex<Indices...>::RangeType>
-    MIndex<Indices...>::range()
-    {
-	return std::dynamic_pointer_cast<RangeType>( mRangePtr );
-    }
-
-    template <class... Indices>	
-    template <SizeT I>
-    decltype(auto) MIndex<Indices...>::stepSize(const IndexId<I>& id) const;
-    {
-	return iter<0,NI>
-	    ( [&](auto i) { return std::get<i>(mIPack)->stepSize(id) * std::get<i>(mBlockSize); },
-	      [](const auto&... ss) { return ( ss + ... ); });
-    }
-
     template <class... Indices>	
     template <class Xpr, class F>
     constexpr decltype(auto) MIndex<Indices...>::ifor(const Xpr& xpr, F&& f) const
     {
 	return mkIFor<0>(xpr, f);
     }
+
+    template <class... Indices>
+    MIndex<Indices...>& MIndex<Indices...>::operator()(const Sptr<MIndex>& mi)
+    {
+	mIPack = mi.mIPack;
+	IB::mPos = iter<0,NI>
+	    ( [&](auto i) { return std::get<i>(mIPack)*std::get<i>(mBlockSizes); },
+	      [](const auto&... xs) { return (xs + ...); });
+	return *this;
+    }
+
+    template <class... Indices>
+    const IndexPack& pack() const
+    {
+	return mIPack;
+    }
+
+    template <class... Indices>
+    const auto& blockSizes() const
+    {
+	return mBlockSizes;
+    }
+
     
     /*********************
      *   MRangeFactory   *
diff --git a/src/include/ranges/mrange.h b/src/include/ranges/mrange.h
index 0b584f0..e8ec9a3 100644
--- a/src/include/ranges/mrange.h
+++ b/src/include/ranges/mrange.h
@@ -26,19 +26,14 @@ namespace CNORXZ
 
 	// NO DEFAULT HERE !!!
 	// ( have to assign sub-indices (ptr!) correctly )
+	MIndex() = default;
 	MIndex(const MIndex& i);
 	MIndex(MIndex&& i);
-	MIndex& operator=(const MIndex& i);
-	MIndex& operator=(MIndex&& i);
+	MIndex& operator=(const MIndex& i) = default;
+	MIndex& operator=(MIndex&& i) = default;
 
 	MIndex(const RangePtr& range, SizeT pos = 0);
 
-	// replace sub-index instances; only use if you know what you are doing!
-	MIndex& operator()(const Sptr<MIndex>& mi);
-
-	const IndexPack& pack() const { return mIPack; }
-	const auto& getBlockSizes() const { return mBlockSizes; }
-	
 	MIndex& operator=(SizeT pos);
 	MIndex& operator++();
 	MIndex& operator--();
@@ -46,29 +41,33 @@ namespace CNORXZ
 	MIndex operator-(Int n) const;
 	MIndex& operator+=(Int n);
 	MIndex& operator-=(Int n);
-	
-	SizeT max() const;
-	decltype(auto) id() const;
-	
-	SizeT operator*() const;
-	SizeT operator->() const;
 
-	SizeT dim();
-	Sptr<RangeType> range();
+	SizeT max() const;
+	IndexId<0> id() const;
+
+	MetaType operator*() const;
+	MetaType operator->() const;
+
+	SizeT dim() const
+	Sptr<RangeType> range() const;
 
 	template <SizeT I>
 	decltype(auto) stepSize(const IndexId<I>& id) const;
-
+	
 	String stringMeta() const;
 	MetaType meta() const;
 	MIndex& at(const MetaType& metaPos);
-
+	
 	template <class Xpr, class F>
 	constexpr decltype(auto) ifor(const Xpr& xpr, F&& f) const;
 
+	// replace sub-index instances; only use if you know what you are doing!
+	MIndex& operator()(const Sptr<MIndex>& mi);
+
+	const IndexPack& pack() const;
+	const auto& blockSizes() const;
+
     private:
-	MIndex() = default;
-	
 	IndexPack mIPack;
 	typedef decltype(mkBlockSizes(Isqr<0,NI-1>{})) BlockTuple;
 	BlockTuple mBlockSizes;