text: #ifndef OSM2PGSQL_OUTPUT_NULL_HPP
  #define OSM2PGSQL_OUTPUT_NULL_HPP
  
  /**
   * SPDX-License-Identifier: GPL-2.0-or-later
   *
   * This file is part of osm2pgsql (https://osm2pgsql.org/).
   *
   * Copyright (C) 2006-2022 by the osm2pgsql developer community.
   * For a full list of authors see the git log.
   */
  
  /* Implements dummy output-layer processing for testing.
  */
  
  #include "output.hpp"
  
  class output_null_t : public output_t
  {
  public:
      output_null_t(std::shared_ptr<middle_query_t> const &mid,
                    std::shared_ptr<thread_pool_t> thread_pool,
                    options_t const &options);
  
      ~output_null_t() override;
  
      std::shared_ptr<output_t>
      clone(std::shared_ptr<middle_query_t> const &mid,
            std::shared_ptr<db_copy_thread_t> const &copy_thread) const override;
  
      void start() override {}
      void stop() override {}
      void sync() override {}
      void cleanup() {}
  
      void pending_way(osmid_t) override {}
      void pending_relation(osmid_t) override {}
  
      void node_add(osmium::Node const & /*node*/) override {}
      void way_add(osmium::Way * /*way*/) override {}
      void relation_add(osmium::Relation const & /*rel*/) override {}
  
      void node_modify(osmium::Node const & /*node*/) override {}
      void way_modify(osmium::Way * /*way*/) override {}
      void relation_modify(osmium::Relation const & /*rel*/) override {}
  
      void node_delete(osmid_t /*id*/) override {}
      void way_delete(osmid_t /*id*/) override {}
      void relation_delete(osmid_t /*id*/) override {}
  };
  
  #endif // OSM2PGSQL_OUTPUT_NULL_HPP
  