visibility_control.hpp

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/*
 * Copyright (c) 2015, Open Source Robotics Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Open Source Robotics Foundation, Inc. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef CLASS_LOADER__VISIBILITY_CONTROL_HPP_
#define CLASS_LOADER__VISIBILITY_CONTROL_HPP_

// 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 CLASS_LOADER_EXPORT __attribute__ ((dllexport))
    #define CLASS_LOADER_IMPORT __attribute__ ((dllimport))
  #else
    #define CLASS_LOADER_EXPORT __declspec(dllexport)
    #define CLASS_LOADER_IMPORT __declspec(dllimport)
  #endif
  #ifdef CLASS_LOADER_BUILDING_DLL
    #define CLASS_LOADER_PUBLIC CLASS_LOADER_EXPORT
  #else
    #define CLASS_LOADER_PUBLIC CLASS_LOADER_IMPORT
  #endif
  #define CLASS_LOADER_PUBLIC_TYPE CLASS_LOADER_PUBLIC
  #define CLASS_LOADER_LOCAL
#else
  #define CLASS_LOADER_EXPORT __attribute__ ((visibility("default")))
  #define CLASS_LOADER_IMPORT
  #if __GNUC__ >= 4
    #define CLASS_LOADER_PUBLIC __attribute__ ((visibility("default")))
    #define CLASS_LOADER_LOCAL  __attribute__ ((visibility("hidden")))
  #else
    #define CLASS_LOADER_PUBLIC
    #define CLASS_LOADER_LOCAL
  #endif
  #define CLASS_LOADER_PUBLIC_TYPE
#endif

// based on wiki.ros.org: http://wiki.ros.org/win_ros/Contributing/Dll%20Exports
// Ignore warnings about import/exports when deriving from std classes.
// https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4251
// https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-2-c4275
#ifdef _MSC_VER
  #pragma warning(disable: 4251)
  #pragma warning(disable: 4275)
#endif

#endif  // CLASS_LOADER__VISIBILITY_CONTROL_HPP_