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query_results.h

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/*
 * Copyright (c) 2008, Willow Garage, Inc.
 * 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 the Willow Garage, Inc. 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
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 */

#ifndef MONGO_ROS_QUERY_RESULTS_H
#define MONGO_ROS_QUERY_RESULTS_H

#include <mongo_ros/message_with_metadata.h>
#include <boost/optional.hpp>

namespace mongo_ros
{

// To avoid some const-correctness issues we wrap Mongo's returned auto_ptr in
// another pointer
typedef auto_ptr<mongo::DBClientCursor> Cursor;
typedef boost::shared_ptr<Cursor> CursorPtr;

template <class M>
class ResultIterator :
    public boost::iterator_facade<ResultIterator<M>,
                                  typename MessageWithMetadata<M>::ConstPtr,
                                  boost::single_pass_traversal_tag,
                                  typename MessageWithMetadata<M>::ConstPtr >
{
public:

  ResultIterator (boost::shared_ptr<mongo::DBClientConnection> conn,
                  const std::string& ns,
                  const mongo::Query& query,
                  boost::shared_ptr<mongo::GridFS> gfs,
                  bool metadata_only);

  ResultIterator (const ResultIterator& rhs);

  ResultIterator ();

private:

  friend class boost::iterator_core_access;

  // Member functions needed to be an iterator
  void increment ();
  typename MessageWithMetadata<M>::ConstPtr dereference () const;
  bool equal (const ResultIterator<M>& other) const;

  const bool metadata_only_;
  CursorPtr cursor_;
  boost::optional<mongo::BSONObj> next_;
  boost::shared_ptr<mongo::GridFS> gfs_;
};

template <class M>
struct QueryResults
{
  typedef std::pair<ResultIterator<M>, ResultIterator<M> > range_t;
};



} // namespace

#include "../../src/query_results_impl.h"

#endif // include guard

---

mongo_ros
Author(s): Bhaskara Marthi
autogenerated on Sat Mar 2 14:18:32 2013