add first version of smart ranges

src/OpenMesh/Core/Mesh/SmartRange.hh

@@ -0,0 +1,84 @@
+/* ========================================================================= *
+ *                                                                           *
+ *                               OpenMesh                                    *
+ *           Copyright (c) 2001-2019, RWTH-Aachen University                 *
+ *           Department of Computer Graphics and Multimedia                  *
+ *                          All rights reserved.                             *
+ *                            www.openmesh.org                               *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * This file is part of OpenMesh.                                            *
+ *---------------------------------------------------------------------------*
+ *                                                                           *
+ * 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.   *
+ *                                                                           *
+ * 3. Neither the name of the copyright holder nor the names of its          *
+ *    contributors may be used to endorse or promote products derived from   *
+ *    this software without specific prior written permission.               *
+ *                                                                           *
+ * 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 HOLDER *
+ * 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    *
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+ *                                                                           *
+ * ========================================================================= */
+
+
+#pragma once
+
+#include <utility>
+
+//== NAMESPACES ===============================================================
+
+namespace OpenMesh {
+
+//== FORWARD DECLARATION ======================================================
+
+//== CLASS DEFINITION =========================================================
+
+/// Base class for all smart range types
+template <typename RangeT, typename HandleT>
+struct SmartRangeT
+{
+  // TODO: Someone with better c++ knowledge may improve the code below.
+
+  template <typename Functor>
+  auto sum(Functor f) -> decltype (f(std::declval<HandleT>())+f(std::declval<HandleT>()))
+  {
+    auto range = static_cast<const RangeT*>(this);
+    auto begin = range->begin();
+    auto end   = range->end();
+    assert(begin != end);
+    decltype (f(*begin) + f(*begin)) sum = f(*begin);
+    auto it = begin;
+    ++it;
+    for (; it != end; ++it)
+      sum += f(*it);
+    return sum;
+  }
+
+};
+
+
+
+//=============================================================================
+} // namespace OpenMesh
+//=============================================================================
+
+//=============================================================================