Program Listing for File connection.h

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#ifndef MESSAGE_FILTERS__CONNECTION_H_
#define MESSAGE_FILTERS__CONNECTION_H_

#include <functional>
#include <memory>

#include "message_filters/visibility_control.h"

namespace message_filters
{

class noncopyable
{
protected:
  noncopyable() {}
  ~noncopyable() {}
  noncopyable( const noncopyable& ) = delete;
  noncopyable& operator=( const noncopyable& ) = delete;
};

class Connection
{
public:
  using VoidDisconnectFunction = std::function<void(void)>;
  using WithConnectionDisconnectFunction = std::function<void(const Connection&)>;
  MESSAGE_FILTERS_PUBLIC Connection() {}
  MESSAGE_FILTERS_PUBLIC Connection(const VoidDisconnectFunction& func);

  MESSAGE_FILTERS_PUBLIC void disconnect();

private:
  VoidDisconnectFunction void_disconnect_;
  WithConnectionDisconnectFunction connection_disconnect_;
};

}  // namespace message_filters

#endif  // MESSAGE_FILTERS__CONNECTION_H_