various fixes + rindex: clear()

src/include/base/types.h

@@ -302,6 +302,10 @@ namespace CNORXZ
     template <typename T, class IndexT>
     class OpRoot;
 
+    // definition: operation/op_types.h
+    template <class Index>
+    class PosOp;
+
     // definition: operation/op_types.h
     template <class F, class... Ops>
     class Operation;

src/include/ranges/crange.h

@@ -117,7 +117,7 @@ namespace CNORXZ
 	bool formatIsTrivial() const;
 	
 	/** @copydoc IndexInterface::xpr() */
-	COpRoot<SizeT,CIndex> xpr(const Sptr<CIndex>& _this) const;
+	PosOp<CIndex> xpr(const Sptr<CIndex>& _this) const;
 
     private:
 	Sptr<RangeType> mRangePtr;

src/lib/ranges/crange.cc

@@ -119,17 +119,9 @@ namespace CNORXZ
 	return *this;
     }
 
-    COpRoot<SizeT,CIndex> CIndex::xpr(const Sptr<CIndex>& _this) const
+    PosOp<CIndex> CIndex::xpr(const Sptr<CIndex>& _this) const
     {
-	// preliminary solution (TODO: implement xpr that simply returns PosT value):
-	static Vector<SizeT> m;
-	if(m.size() < _this->lmax().val()){
-	    m.resize(_this->lmax().val());
-	    for(SizeT i = 0; i != m.size(); ++i) {
-		m[i] = i;
-	    }
-	}
-	return coproot(m.data(), _this);
+	return posop(_this);
     }
 
     RangePtr CIndex::prange(const CIndex& last) const

src/lib/ranges/yrange.cc

@@ -110,7 +110,10 @@ namespace CNORXZ
     
     inline decltype(auto) YIndex::mkIFor(SizeT i, const DXpr<None>& xpr, NoF&& f) const
     {
-	if(i == mIs.size()-1){
+	if(i == mIs.size()){
+	    return DXpr<None>(xpr);
+	}
+	else if(i == mIs.size()-1){
 	    return mIs[i]->ifor( xpr, std::forward<NoF>(f) );
 	}
 	else {
@@ -335,12 +338,17 @@ namespace CNORXZ
 	const String blim = "[";
 	const String elim = "]";
 	const String dlim = ",";
+	if(mIs.size() == 0){
+	    return blim + elim;
+	}
+	else {
 	    return blim +
 		std::accumulate(std::next(mIs.all().begin()), mIs.all().end(), mIs[0]->stringMeta(),
 				[&](const auto& s, const auto& e)
 				{ return s + dlim + e->stringMeta(); } ) +
 		elim;
 	}
+    }
    
     Vector<DType> YIndex::meta() const
     {

src/opt/mpi/include/rarray.cc.h

@@ -249,6 +249,13 @@ namespace CNORXZ
 	    setupBuffer(ai, required, *mA, mBuf, mMap, blocks);
 	}
 
+	template <typename T>
+	void RCArray<T>::clear() const
+	{
+	    mBuf.resize(0);
+	    mMap.resize(0);
+	}
+	
 	/*==============+
 	 |    RArray    |
 	 +==============*/

src/opt/mpi/include/rarray.h

@@ -134,6 +134,9 @@ namespace CNORXZ
 		      const Sptr<I>& i, const Vector<bool>& required) const;
 
 
+	    /** Clear data loaded from other ranks. */
+	    void clear() const;
+	    
 	protected:
 	    ObjHandle<CArrayBase<T>> mA;
 	    RangePtr mGeom;
@@ -165,6 +168,7 @@ namespace CNORXZ
 	    using RCA::cbegin;
 	    using RCA::cend;
 	    using RCA::sl;
+	    using RCA::local;
 
 	    DEFAULT_C(RArray);
 	    DEFAULT_MOVE(RArray);