.. _program_listing_file__tmp_ws_src_vision_msgs_layers_vision_msgs_layers_include_vision_msgs_layers_visibility_control.h:

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

|exhale_lsh| :ref:`Return to documentation for file <file__tmp_ws_src_vision_msgs_layers_vision_msgs_layers_include_vision_msgs_layers_visibility_control.h>` (``/tmp/ws/src/vision_msgs_layers/vision_msgs_layers/include/vision_msgs_layers/visibility_control.h``)

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

.. code-block:: cpp

   // Copyright 2022 Kenji Brameld
   //
   // 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.
   
   #ifndef VISION_MSGS_LAYERS__VISIBILITY_CONTROL_H_
   #define VISION_MSGS_LAYERS__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 VISION_MSGS_LAYERS_EXPORT __attribute__ ((dllexport))
       #define VISION_MSGS_LAYERS_IMPORT __attribute__ ((dllimport))
     #else
       #define VISION_MSGS_LAYERS_EXPORT __declspec(dllexport)
       #define VISION_MSGS_LAYERS_IMPORT __declspec(dllimport)
     #endif
     #ifdef VISION_MSGS_LAYERS_BUILDING_LIBRARY
       #define VISION_MSGS_LAYERS_PUBLIC VISION_MSGS_LAYERS_EXPORT
     #else
       #define VISION_MSGS_LAYERS_PUBLIC VISION_MSGS_LAYERS_IMPORT
     #endif
     #define VISION_MSGS_LAYERS_PUBLIC_TYPE VISION_MSGS_LAYERS_PUBLIC
     #define VISION_MSGS_LAYERS_LOCAL
   #else
     #define VISION_MSGS_LAYERS_EXPORT __attribute__ ((visibility("default")))
     #define VISION_MSGS_LAYERS_IMPORT
     #if __GNUC__ >= 4
       #define VISION_MSGS_LAYERS_PUBLIC __attribute__ ((visibility("default")))
       #define VISION_MSGS_LAYERS_LOCAL  __attribute__ ((visibility("hidden")))
     #else
       #define VISION_MSGS_LAYERS_PUBLIC
       #define VISION_MSGS_LAYERS_LOCAL
     #endif
     #define VISION_MSGS_LAYERS_PUBLIC_TYPE
   #endif
   
   #endif  // VISION_MSGS_LAYERS__VISIBILITY_CONTROL_H_