.. _program_listing_file_include_rclcpp_allocator_allocator_deleter.hpp:

Program Listing for File allocator_deleter.hpp
==============================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rclcpp_allocator_allocator_deleter.hpp>` (``include/rclcpp/allocator/allocator_deleter.hpp``)

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

.. code-block:: cpp

   // Copyright 2015 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__ALLOCATOR__ALLOCATOR_DELETER_HPP_
   #define RCLCPP__ALLOCATOR__ALLOCATOR_DELETER_HPP_
   
   #include <memory>
   #include <stdexcept>
   
   namespace rclcpp
   {
   namespace allocator
   {
   
   template<typename Allocator>
   class AllocatorDeleter
   {
     template<typename T>
     using AllocRebind = typename std::allocator_traits<Allocator>::template rebind_alloc<T>;
   
   public:
     AllocatorDeleter()
     : allocator_(nullptr)
     {
     }
   
     explicit AllocatorDeleter(Allocator * a)
     : allocator_(a)
     {
     }
   
     template<typename T>
     explicit AllocatorDeleter(const AllocatorDeleter<T> & a)
     {
       allocator_ = a.get_allocator();
     }
   
     template<typename T>
     void operator()(T * ptr)
     {
       std::allocator_traits<AllocRebind<T>>::destroy(*allocator_, ptr);
       std::allocator_traits<AllocRebind<T>>::deallocate(*allocator_, ptr, 1);
       ptr = nullptr;
     }
   
     Allocator * get_allocator() const
     {
       return allocator_;
     }
   
     void set_allocator(Allocator * alloc)
     {
       allocator_ = alloc;
     }
   
   private:
     Allocator * allocator_;
   };
   
   template<typename Alloc, typename T, typename D>
   void set_allocator_for_deleter(D * deleter, Alloc * alloc)
   {
     (void) alloc;
     (void) deleter;
     throw std::runtime_error("Reached unexpected template specialization");
   }
   
   template<typename T, typename U>
   void set_allocator_for_deleter(std::default_delete<T> * deleter, std::allocator<U> * alloc)
   {
     (void) deleter;
     (void) alloc;
   }
   
   template<typename Alloc, typename T>
   void set_allocator_for_deleter(AllocatorDeleter<T> * deleter, Alloc * alloc)
   {
     if (!deleter || !alloc) {
       throw std::invalid_argument("Argument was NULL to set_allocator_for_deleter");
     }
     deleter->set_allocator(alloc);
   }
   
   template<typename Alloc, typename T>
   using Deleter = typename std::conditional<
     std::is_same<typename std::allocator_traits<Alloc>::template rebind_alloc<T>,
     std::allocator<T>>::value,
     std::default_delete<T>,
     AllocatorDeleter<Alloc>
     >::type;
   }  // namespace allocator
   }  // namespace rclcpp
   
   #endif  // RCLCPP__ALLOCATOR__ALLOCATOR_DELETER_HPP_