[ADD] ParticleAccessorWithShape

as this class is often needed it is now part of the mesa_pd core

src/mesa_pd/data/ParticleAccessorWithShape.h

+//======================================================================================================================
+//
+//  This file is part of waLBerla. waLBerla is free software: you can
+//  redistribute it and/or modify it under the terms of the GNU General Public
+//  License as published by the Free Software Foundation, either version 3 of
+//  the License, or (at your option) any later version.
+//
+//  waLBerla 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 General Public License
+//  for more details.
+//
+//  You should have received a copy of the GNU General Public License along
+//  with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ParticleAccessorWithShape.h
+//! \author Sebastian Eibl <sebastian.eibl@fau.de>
+//
+//======================================================================================================================
+
+#pragma once
+
+#include <mesa_pd/data/ParticleAccessor.h>
+#include <mesa_pd/data/ParticleStorage.h>
+#include <mesa_pd/data/ShapeStorage.h>
+
+namespace walberla {
+namespace mesa_pd {
+namespace data {
+
+class ParticleAccessorWithShape : public data::ParticleAccessor
+{
+public:
+   ParticleAccessorWithShape(std::shared_ptr<data::ParticleStorage>& ps, std::shared_ptr<data::ShapeStorage>& ss)
+      : ParticleAccessor(ps)
+      , ss_(ss)
+   {}
+
+   const auto& getInvMass(const size_t p_idx) const {return ss_->shapes[ps_->getShapeIDRef(p_idx)]->getInvMass();}
+   const auto& getInvInertiaBF(const size_t p_idx) const {return ss_->shapes[ps_->getShapeIDRef(p_idx)]->getInvInertiaBF();}
+
+   data::BaseShape* getShape(const size_t p_idx) const {return ss_->shapes[ps_->getShapeIDRef(p_idx)].get();}
+private:
+   std::shared_ptr<data::ShapeStorage> ss_;
+};
+
+} //namespace data
+} //namespace mesa_pd
+} //namespace walberla