text: // Copyright 2016 Open Source Robotics Foundation, Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /* This header must be included by all rclcpp headers which declare symbols
   * which are defined in the rclcpp library. When not building the rclcpp
   * library, i.e. when using the headers in other package's code, the contents
   * of this header change the visibility of certain symbols which the rclcpp
   * library cannot have, but the consuming code must have inorder to link.
   */
  
  #ifndef RCLCPP_LIFECYCLE__VISIBILITY_CONTROL_H_
  #define RCLCPP_LIFECYCLE__VISIBILITY_CONTROL_H_
  
  // This logic was borrowed (then namespaced) from the examples on the gcc wiki:
  //     https://gcc.gnu.org/wiki/Visibility
  
  #if defined _WIN32 || defined __CYGWIN__
    #ifdef __GNUC__
      #define RCLCPP_LIFECYCLE_EXPORT __attribute__ ((dllexport))
      #define RCLCPP_LIFECYCLE_IMPORT __attribute__ ((dllimport))
    #else
      #define RCLCPP_LIFECYCLE_EXPORT __declspec(dllexport)
      #define RCLCPP_LIFECYCLE_IMPORT __declspec(dllimport)
    #endif
    #ifdef RCLCPP_LIFECYCLE_BUILDING_DLL
      #define RCLCPP_LIFECYCLE_PUBLIC RCLCPP_LIFECYCLE_EXPORT
    #else
      #define RCLCPP_LIFECYCLE_PUBLIC RCLCPP_LIFECYCLE_IMPORT
    #endif
    #define RCLCPP_LIFECYCLE_PUBLIC_TYPE RCLCPP_LIFECYCLE_PUBLIC
    #define RCLCPP_LIFECYCLE_LOCAL
  #else
    #define RCLCPP_LIFECYCLE_EXPORT __attribute__ ((visibility("default")))
    #define RCLCPP_LIFECYCLE_IMPORT
    #if __GNUC__ >= 4
      #define RCLCPP_LIFECYCLE_PUBLIC __attribute__ ((visibility("default")))
      #define RCLCPP_LIFECYCLE_LOCAL  __attribute__ ((visibility("hidden")))
    #else
      #define RCLCPP_LIFECYCLE_PUBLIC
      #define RCLCPP_LIFECYCLE_LOCAL
    #endif
    #define RCLCPP_LIFECYCLE_PUBLIC_TYPE
  #endif
  
  #endif  // RCLCPP_LIFECYCLE__VISIBILITY_CONTROL_H_
  