Program Listing for File pass_through.h

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#ifndef MESSAGE_FILTERS__PASS_THROUGH_H_
#define MESSAGE_FILTERS__PASS_THROUGH_H_

#include <vector>

#include "message_filters/simple_filter.h"

namespace message_filters
{
template<typename M>
class PassThrough : public SimpleFilter<M>
{
public:
  typedef std::shared_ptr<M const> MConstPtr;
  typedef MessageEvent<M const> EventType;

  PassThrough()
  {
  }

  template<typename F>
  PassThrough(F& f)
  {
    connectInput(f);
  }

  template<class F>
  void connectInput(F& f)
  {
    incoming_connection_.disconnect();
    incoming_connection_ = f.registerCallback(typename SimpleFilter<M>::EventCallback(std::bind(&PassThrough::cb, this, std::placeholders::_1)));
  }

  void add(const MConstPtr& msg)
  {
    add(EventType(msg));
  }

  void add(const EventType& evt)
  {
    this->signalMessage(evt);
  }

private:
  void cb(const EventType& evt)
  {
    add(evt);
  }

  Connection incoming_connection_;
};

}  // namespace message_filters

#endif  // MESSAGE_FILTERS__PASS_THROUGH_H_