.. _program_listing_file_include_rmw_fastrtps_cpp_visibility_control.h:

Program Listing for File visibility_control.h
=============================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rmw_fastrtps_cpp_visibility_control.h>` (``include/rmw_fastrtps_cpp/visibility_control.h``)

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

.. code-block:: cpp

   // Copyright 2017 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 RMW_FASTRTPS_CPP__VISIBILITY_CONTROL_H_
   #define RMW_FASTRTPS_CPP__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 RMW_FASTRTPS_CPP_EXPORT __attribute__ ((dllexport))
       #define RMW_FASTRTPS_CPP_IMPORT __attribute__ ((dllimport))
     #else
       #define RMW_FASTRTPS_CPP_EXPORT __declspec(dllexport)
       #define RMW_FASTRTPS_CPP_IMPORT __declspec(dllimport)
     #endif
     #ifdef RMW_FASTRTPS_CPP_BUILDING_LIBRARY
       #define RMW_FASTRTPS_CPP_PUBLIC RMW_FASTRTPS_CPP_EXPORT
     #else
       #define RMW_FASTRTPS_CPP_PUBLIC RMW_FASTRTPS_CPP_IMPORT
     #endif
     #define RMW_FASTRTPS_CPP_PUBLIC_TYPE RMW_FASTRTPS_CPP_PUBLIC
     #define RMW_FASTRTPS_CPP_LOCAL
   #else
     #define RMW_FASTRTPS_CPP_EXPORT __attribute__ ((visibility("default")))
     #define RMW_FASTRTPS_CPP_IMPORT
     #if __GNUC__ >= 4
       #define RMW_FASTRTPS_CPP_PUBLIC __attribute__ ((visibility("default")))
       #define RMW_FASTRTPS_CPP_LOCAL  __attribute__ ((visibility("hidden")))
     #else
       #define RMW_FASTRTPS_CPP_PUBLIC
       #define RMW_FASTRTPS_CPP_LOCAL
     #endif
     #define RMW_FASTRTPS_CPP_PUBLIC_TYPE
   #endif
   
   #endif  // RMW_FASTRTPS_CPP__VISIBILITY_CONTROL_H_