From ec8936bfa6d74274146a44a86b0dccf0b25efa62 Mon Sep 17 00:00:00 2001
From: Hans-Christian Ebke <ebke@cs.rwth-aachen.de>
Date: Tue, 24 Nov 2015 01:45:44 +0100
Subject: [PATCH] Introduce ArrayKernel::clean_keep_reservation().

---
 src/OpenMesh/Core/Mesh/ArrayKernel.cc | 10 ++++++++++
 src/OpenMesh/Core/Mesh/ArrayKernel.hh |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/OpenMesh/Core/Mesh/ArrayKernel.cc b/src/OpenMesh/Core/Mesh/ArrayKernel.cc
index de857351..00c8d3c5 100644
--- a/src/OpenMesh/Core/Mesh/ArrayKernel.cc
+++ b/src/OpenMesh/Core/Mesh/ArrayKernel.cc
@@ -177,6 +177,16 @@ void ArrayKernel::garbage_collection(bool _v, bool _e, bool _f)
   garbage_collection( empty_vh,empty_hh,empty_fh,_v, _e, _f);
 }
 
+void ArrayKernel::clean_keep_reservation()
+{
+    vertices_.clear();
+
+    edges_.clear();
+
+    faces_.clear();
+
+}
+
 void ArrayKernel::clean()
 {
 
diff --git a/src/OpenMesh/Core/Mesh/ArrayKernel.hh b/src/OpenMesh/Core/Mesh/ArrayKernel.hh
index ca64af46..eea18385 100644
--- a/src/OpenMesh/Core/Mesh/ArrayKernel.hh
+++ b/src/OpenMesh/Core/Mesh/ArrayKernel.hh
@@ -306,6 +306,14 @@ public:
    */
   void clean();
 
+  /** \brief Reset the whole mesh
+   *
+   *  This will remove all elements from the mesh but keeps the properties.
+   *  In contrast to clean() the memory used for the elements will remain
+   *  allocated.
+   */
+  void clean_keep_reservation();
+
   // --- number of items ---
   size_t n_vertices()  const { return vertices_.size(); }
   size_t n_halfedges() const { return 2*edges_.size(); }