[grid] introduces range adapters for views/intersection

dune/stuff/grid/ranges.hh

+#ifndef DUNE_STUFF_RANGES_RANGES_HH
+#define DUNE_STUFF_RANGES_RANGES_HH
+
+namespace Dune {
+namespace Stuff {
+namespace Grid {
+
+//! adapter enabling view usage in range-based for
+template <class GridViewType, int codim = 0>
+class ViewRange
+{
+  const GridViewType& view_;
+
+public:
+  ViewRange(const GridViewType& view)
+    : view_(view)
+  {
+  }
+
+  typename GridViewType::template Codim<codim>::Iterator begin() const
+  {
+    return view_.template begin<codim>();
+  }
+  typename GridViewType::template Codim<codim>::Iterator end() const
+  {
+    return view_.template end<codim>();
+  }
+};
+
+//! adapter enabling intersectionniterator usage in range-based for
+template <class GridViewType>
+class IntersectionRange
+{
+  typedef typename GridViewType::template Codim<0>::Entity EntityType;
+  const GridViewType& view_;
+  const EntityType& entity_;
+
+public:
+  IntersectionRange(const GridViewType& view, const EntityType& entity)
+    : view_(view)
+    , entity_(entity)
+  {
+  }
+
+  typename GridViewType::IntersectionIterator begin() const
+  {
+    return view_.ibegin(entity_);
+  }
+  typename GridViewType::IntersectionIterator end() const
+  {
+    return view_.iend(entity_);
+  }
+};
+
+} // namespace Grid
+} // namespace Stud
+} // namespace Dune
+
+#endif // DUNE_STUFF_RANGES_RANGES_HH
+/** Copyright (c) 2012, Felix Albrecht, Rene Milk
+   * All rights reserved.
+   *
+   * Redistribution and use in source and binary forms, with or without
+   * modification, are permitted provided that the following conditions are met:
+   *
+   * 1. Redistributions of source code must retain the above copyright notice, this
+   *    list of conditions and the following disclaimer.
+   * 2. Redistributions in binary form must reproduce the above copyright notice,
+   *    this list of conditions and the following disclaimer in the documentation
+   *    and/or other materials provided with the distribution.
+   *
+   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+   *
+   * The views and conclusions contained in the software and documentation are those
+   * of the authors and should not be interpreted as representing official policies,
+   * either expressed or implied, of the FreeBSD Project.
+   **/