signal1.h

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#ifndef MESSAGE_FILTERS_SIGNAL1_H
#define MESSAGE_FILTERS_SIGNAL1_H

#include <boost/noncopyable.hpp>

#include "connection.h"
#include <ros/message_event.h>
#include <ros/parameter_adapter.h>

#include <boost/bind.hpp>
#include <boost/thread/mutex.hpp>

namespace message_filters
{
template<class M>
class CallbackHelper1
{
public:
  virtual ~CallbackHelper1() {}

  virtual void call(const ros::MessageEvent<M const>& event, bool nonconst_need_copy) = 0;

  typedef boost::shared_ptr<CallbackHelper1<M> > Ptr;
};

template<typename P, typename M>
class CallbackHelper1T : public CallbackHelper1<M>
{
public:
  typedef ros::ParameterAdapter<P> Adapter;
  typedef boost::function<void(typename Adapter::Parameter)> Callback;
  typedef typename Adapter::Event Event;

  CallbackHelper1T(const Callback& cb)
  : callback_(cb)
  {
  }

  virtual void call(const ros::MessageEvent<M const>& event, bool nonconst_force_copy)
  {
    Event my_event(event, nonconst_force_copy || event.nonConstWillCopy());
    callback_(Adapter::getParameter(my_event));
  }

private:
  Callback callback_;
};

template<class M>
class Signal1
{
  typedef boost::shared_ptr<CallbackHelper1<M> > CallbackHelper1Ptr;
  typedef std::vector<CallbackHelper1Ptr> V_CallbackHelper1;

public:
  template<typename P>
  CallbackHelper1Ptr addCallback(const boost::function<void(P)>& callback)
  {
    CallbackHelper1T<P, M>* helper = new CallbackHelper1T<P, M>(callback);

    boost::mutex::scoped_lock lock(mutex_);
    callbacks_.push_back(CallbackHelper1Ptr(helper));
    return callbacks_.back();
  }

  void removeCallback(const CallbackHelper1Ptr& helper)
  {
    boost::mutex::scoped_lock lock(mutex_);
    typename V_CallbackHelper1::iterator it = std::find(callbacks_.begin(), callbacks_.end(), helper);
    if (it != callbacks_.end())
    {
      callbacks_.erase(it);
    }
  }

  void call(const ros::MessageEvent<M const>& event)
  {
    boost::mutex::scoped_lock lock(mutex_);
    bool nonconst_force_copy = callbacks_.size() > 1;
    typename V_CallbackHelper1::iterator it = callbacks_.begin();
    typename V_CallbackHelper1::iterator end = callbacks_.end();
    for (; it != end; ++it)
    {
      const CallbackHelper1Ptr& helper = *it;
      helper->call(event, nonconst_force_copy);
    }
  }

private:
  boost::mutex mutex_;
  V_CallbackHelper1 callbacks_;
};

} // message_filters

#endif // MESSAGE_FILTERS_SIGNAL1_H