--- /dev/null
+// Copyright (C) 2007-2012 CEA/DEN, EDF R&D, OPEN CASCADE
+//
+// Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// SMESH SMDS : implementaion of Salome mesh data structure
+// File : SMDS_IteratorOnIterators.hxx
+// Author : Edward AGAPOV (eap)
+//
+#ifndef SMDS_IteratorOnIterators_HeaderFile
+#define SMDS_IteratorOnIterators_HeaderFile
+
+#include "SMDS_Iterator.hxx"
+
+///////////////////////////////////////////////////////////////////////////////
+/// SMDS_Iterator iterating over all elements provided by other iterators
+///
+/// Other iterators must implement SMDS_Iterator iterface and
+/// must be provided within a stl-like container
+/// BE CAREFUL: iterator pointed value is static_cast'ed to VALUE
+///////////////////////////////////////////////////////////////////////////////
+
+template<typename VALUE,
+ typename CONTAINER_OF_ITERATORS >
+class SMDS_IteratorOnIterators : public SMDS_Iterator<VALUE>
+{
+protected:
+ CONTAINER_OF_ITERATORS _iterators;
+ typename CONTAINER_OF_ITERATORS::iterator _beg, _end;
+public:
+ SMDS_IteratorOnIterators(const CONTAINER_OF_ITERATORS& iterators):
+ _iterators( iterators ), _beg( _iterators.begin()), _end(_iterators.end() )
+ {
+ while ( _beg != _end && !(*_beg)->more()) ++_beg;
+ }
+
+ /// Return true iff there are other object in this iterator
+ virtual bool more() { return _beg != _end && (*_beg)->more(); }
+
+ /// Return the current object and step to the next one
+ virtual VALUE next()
+ {
+ VALUE __v = (VALUE)(*_beg)->next();
+ while ( _beg != _end && !(*_beg)->more())
+ ++_beg;
+ return __v;
+ }
+};
+
+#endif
