.. _program_listing_file__tmp_ws_src_gazebo_ros_pkgs_gazebo_ros_include_gazebo_ros_utils_visibility_control.h:

Program Listing for File utils_visibility_control.h
===================================================

|exhale_lsh| :ref:`Return to documentation for file <file__tmp_ws_src_gazebo_ros_pkgs_gazebo_ros_include_gazebo_ros_utils_visibility_control.h>` (``/tmp/ws/src/gazebo_ros_pkgs/gazebo_ros/include/gazebo_ros/utils_visibility_control.h``)

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

.. code-block:: cpp

   // Copyright 2020 Microsoft Corporation.
   //
   // 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 GAZEBO_ROS__UTILS_VISIBILITY_CONTROL_H_
   #define GAZEBO_ROS__UTILS_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 GAZEBO_ROS_UTILS_EXPORT __attribute__ ((dllexport))
       #define GAZEBO_ROS_UTILS_IMPORT __attribute__ ((dllimport))
     #else
       #define GAZEBO_ROS_UTILS_EXPORT __declspec(dllexport)
       #define GAZEBO_ROS_UTILS_IMPORT __declspec(dllimport)
     #endif
     #ifdef GAZEBO_ROS_UTILS_BUILDING_DLL
       #define GAZEBO_ROS_UTILS_PUBLIC GAZEBO_ROS_UTILS_EXPORT
     #else
       #define GAZEBO_ROS_UTILS_PUBLIC GAZEBO_ROS_UTILS_IMPORT
     #endif
     #define GAZEBO_ROS_UTILS_PUBLIC_TYPE GAZEBO_ROS_UTILS_PUBLIC
     #define GAZEBO_ROS_UTILS_LOCAL
   #else
     #define GAZEBO_ROS_UTILS_EXPORT __attribute__ ((visibility("default")))
     #define GAZEBO_ROS_UTILS_IMPORT
     #if __GNUC__ >= 4
       #define GAZEBO_ROS_UTILS_PUBLIC __attribute__ ((visibility("default")))
       #define GAZEBO_ROS_UTILS_LOCAL  __attribute__ ((visibility("hidden")))
     #else
       #define GAZEBO_ROS_UTILS_PUBLIC
       #define GAZEBO_ROS_UTILS_LOCAL
     #endif
     #define GAZEBO_ROS_UTILS_PUBLIC_TYPE
   #endif
   
   #endif  // GAZEBO_ROS__UTILS_VISIBILITY_CONTROL_H_