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/*
 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2011-2014, Willow Garage, Inc.
 *  Copyright (c) 2014-2016, Open Source Robotics Foundation
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *   * Neither the name of Open Source Robotics Foundation 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 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.
 */

/** \author Jia Pan */

#ifndef FCL_BVH_FRONT_H
#define FCL_BVH_FRONT_H


#include <list>

namespace fcl
{

/// @brief Front list acceleration for collision
/// Front list is a set of internal and leaf nodes in the BVTT hierarchy, where
/// the traversal terminates while performing a query during a given time instance. The front list reflects the subset of a
/// BVTT that is traversed for that particular proximity query.
struct BVHFrontNode
{
  /// @brief The nodes to start in the future, i.e. the wave front of the traversal tree.
  int left, right;

  /// @brief The front node is not valid when collision is detected on the front node.
  bool valid;

  BVHFrontNode(int left_, int right_) : left(left_),
                                        right(right_),
                                        valid(true)
  {
  }
};

/// @brief BVH front list is a list of front nodes.
typedef std::list<BVHFrontNode> BVHFrontList;

/// @brief Add new front node into the front list
inline void updateFrontList(BVHFrontList* front_list, int b1, int b2)
{
  if(front_list) front_list->push_back(BVHFrontNode(b1, b2));
}


}

#endif