.. _program_listing_file_include_rclcpp_detail_cpp_callback_trampoline.hpp:

Program Listing for File cpp_callback_trampoline.hpp
====================================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rclcpp_detail_cpp_callback_trampoline.hpp>` (``include/rclcpp/detail/cpp_callback_trampoline.hpp``)

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

.. code-block:: cpp

   // Copyright 2021 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.
   
   #ifndef RCLCPP__DETAIL__CPP_CALLBACK_TRAMPOLINE_HPP_
   #define RCLCPP__DETAIL__CPP_CALLBACK_TRAMPOLINE_HPP_
   
   #include <functional>
   
   namespace rclcpp
   {
   
   namespace detail
   {
   
   
   template<
     typename UserDataT,
     typename ... Args,
     typename ReturnT = void
   >
   ReturnT
   cpp_callback_trampoline(UserDataT user_data, Args ... args) noexcept
   {
     auto & actual_callback = *reinterpret_cast<const std::function<ReturnT(Args...)> *>(user_data);
     return actual_callback(args ...);
   }
   
   }  // namespace detail
   
   }  // namespace rclcpp
   
   #endif  // RCLCPP__DETAIL__CPP_CALLBACK_TRAMPOLINE_HPP_