.. _program_listing_file_include_rcpputils_pointer_traits.hpp:

Program Listing for File pointer_traits.hpp
===========================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rcpputils_pointer_traits.hpp>` (``include/rcpputils/pointer_traits.hpp``)

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

.. code-block:: cpp

   // Copyright 2019 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 RCPPUTILS__POINTER_TRAITS_HPP_
   #define RCPPUTILS__POINTER_TRAITS_HPP_
   
   #include <memory>
   #include <type_traits>
   
   namespace rcpputils
   {
   
   namespace details
   {
   
   template<class T>
   struct is_smart_pointer_helper : std::false_type
   {};
   
   template<class T>
   struct is_smart_pointer_helper<std::shared_ptr<T>>: std::true_type
   {};
   
   template<class T>
   struct is_smart_pointer_helper<std::unique_ptr<T>>: std::true_type
   {};
   
   template<class T>
   struct is_smart_pointer : is_smart_pointer_helper<typename std::remove_cv<T>::type>
   {};
   
   template<
     class T,
     bool is_smart_pointer
   >
   struct remove_pointer
   {
     using type = typename std::remove_pointer<T>::type;
   };
   
   template<class T>
   struct remove_pointer<T, true>
   {
     using type = typename std::remove_pointer<
       decltype(std::declval<typename std::remove_volatile<T>::type>().get())>::type;
   };
   }  // namespace details
   
   
   template<class T>
   struct is_pointer
   {
     static constexpr bool value = std::is_pointer<typename std::remove_reference<T>::type>::value ||
       details::is_smart_pointer<typename std::remove_reference<T>::type>::value;
   };
   
   
   template<class T>
   struct remove_pointer
   {
     using type = typename details::remove_pointer<
       typename std::remove_reference<T>::type, details::is_smart_pointer<T>::value>::type;
   };
   
   }  // namespace rcpputils
   
   #endif  // RCPPUTILS__POINTER_TRAITS_HPP_