.. _program_listing_file__tmp_ws_src_message_filters_include_message_filters_pass_through.h:

Program Listing for File pass_through.h
=======================================

|exhale_lsh| :ref:`Return to documentation for file <file__tmp_ws_src_message_filters_include_message_filters_pass_through.h>` (``/tmp/ws/src/message_filters/include/message_filters/pass_through.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   /*********************************************************************
   * Software License Agreement (BSD License)
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   *  Copyright (c) 2010, Willow Garage, Inc.
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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_