text: /*ckwg +29
   * Copyright 2012-2017 by Kitware, Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  * Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   *  * Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   *  * Neither name of Kitware, Inc. nor the names of any 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
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef SPROKIT_PROCESSES_EXAMPLES_FEEDBACK_PROCESS_H
  #define SPROKIT_PROCESSES_EXAMPLES_FEEDBACK_PROCESS_H
  
  #include "processes_examples_export.h"
  
  #include <sprokit/pipeline/process.h>
  
  /**
   * \file feedback_process.h
   *
   * \brief Declaration of the feedback process.
   */
  
  namespace sprokit
  {
  
  /**
   * \class feedback_process
   *
   * \brief A process with its own backwards edge.
   *
   * \process A process with its own backwards edge.
   *
   * \iports
   *
   * \iport{input} The datum generated the previous step.
   *
   * \oports
   *
   * \oport{output} The datum generated for the step.
   *
   * \reqs
   *
   * \req The ports \port{input} and \port{output} must be connected.
   *
   * \ingroup examples
   */
  class PROCESSES_EXAMPLES_NO_EXPORT feedback_process
    : public process
  {
    public:
      /**
       * \brief Constructor.
       *
       * \param config The configuration for the process.
       */
      feedback_process(kwiver::vital::config_block_sptr const& config);
      /**
       * \brief Destructor.
       */
      ~feedback_process();
    protected:
      /**
       * \brief Flush the process.
       */
      void _flush();
      /**
       * \brief Step the process.
       */
      void _step();
    private:
      class priv;
      std::unique_ptr<priv> d;
  };
  
  }
  
  #endif // SPROKIT_PROCESSES_EXAMPLES_FEEDBACK_PROCESS_H
  