subscriber.h

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/*
 * Copyright (C) 2009, Willow Garage, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *     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
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#ifndef ROSCPP_SUBSCRIBER_HANDLE_H
#define ROSCPP_SUBSCRIBER_HANDLE_H

#include "common.h"
#include "ros/forwards.h"
#include "ros/subscription_callback_helper.h"

namespace ros
{

class ROSCPP_DECL Subscriber
{
public:
  Subscriber() {}
  Subscriber(const Subscriber& rhs);
  ~Subscriber();

  void shutdown();

  std::string getTopic() const;

  uint32_t getNumPublishers() const;

  operator void*() const { return (impl_ && impl_->isValid()) ? (void*)1 : (void*)0; }

  bool operator<(const Subscriber& rhs) const
  {
    return impl_ < rhs.impl_;
  }

  bool operator==(const Subscriber& rhs) const
  {
    return impl_ == rhs.impl_;
  }

  bool operator!=(const Subscriber& rhs) const
  {
    return impl_ != rhs.impl_;
  }

private:

  Subscriber(const std::string& topic, const NodeHandle& node_handle, 
             const SubscriptionCallbackHelperPtr& helper);

  class Impl
  {
  public:
    Impl();
    ~Impl();

    void unsubscribe();
    bool isValid() const;

    std::string topic_;
    NodeHandlePtr node_handle_;
    SubscriptionCallbackHelperPtr helper_;
    bool unsubscribed_;
  };
  typedef boost::shared_ptr<Impl> ImplPtr;
  typedef boost::weak_ptr<Impl> ImplWPtr;

  ImplPtr impl_;

  friend class NodeHandle;
  friend class NodeHandleBackingCollection;
};
typedef std::vector<Subscriber> V_Subscriber;

}

#endif // ROSCPP_PUBLISHER_HANDLE_H