.. _program_listing_file_include_rclcpp_detail_template_contains.hpp:

Program Listing for File template_contains.hpp
==============================================

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

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

.. code-block:: cpp

   // Copyright 2022 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__TEMPLATE_CONTAINS_HPP_
   #define RCLCPP__DETAIL__TEMPLATE_CONTAINS_HPP_
   
   #include <type_traits>
   
   namespace rclcpp
   {
   namespace detail
   {
   
   template<typename T, typename ... Us>
   struct template_contains;
   
   template<typename ... Args>
   inline constexpr bool template_contains_v = template_contains<Args ...>::value;
   
   template<typename T, typename NextT, typename ... Us>
   struct template_contains<T, NextT, Us ...>
   {
     enum { value = (std::is_same_v<T, NextT>|| template_contains_v<T, Us ...>)};
   };
   
   template<typename T>
   struct template_contains<T>
   {
     enum { value = false };
   };
   
   }  // namespace detail
   }  // namespace rclcpp
   
   #endif  // RCLCPP__DETAIL__TEMPLATE_CONTAINS_HPP_