.. _program_listing_file_include_fastcdr_xcdr_external.hpp:

Program Listing for File external.hpp
=====================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_fastcdr_xcdr_external.hpp>` (``include/fastcdr/xcdr/external.hpp``)

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

.. code-block:: cpp

   // Copyright 2023 Proyectos y Sistemas de Mantenimiento SL (eProsima).
   //
   // 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 _FASTCDR_XCDR_EXTERNAL_HPP_
   #define _FASTCDR_XCDR_EXTERNAL_HPP_
   
   #include <memory>
   
   #include "../exceptions/LockedExternalAccessException.hpp"
   
   namespace eprosima {
   namespace fastcdr {
   
   template<class T>
   class external
   {
   public:
   
       using type = T;
   
       external() = default;
   
       external(
               T* pointer,
               bool locked = false) noexcept
           : pointer_ {pointer}
           , locked_ {locked}
       {
       }
   
       external(
               std::shared_ptr<T> pointer) noexcept
           : pointer_ {pointer}
       {
       }
   
       external(
               const external<T>& other) noexcept
           : locked_ {other.locked_}
       {
           if (locked_)
           {
               pointer_ = std::make_shared<T>(*other.pointer_);
           }
           else
           {
               pointer_ = other.pointer_;
           }
       }
   
       external<T>& operator =(
               const external<T>& other)
       {
           if (locked_)
           {
               throw exception::LockedExternalAccessException(
                         exception::LockedExternalAccessException::LOCKED_EXTERNAL_ACCESS_MESSAGE_DEFAULT);
           }
   
           if (!other.pointer_)
           {
               pointer_.reset();
           }
           else if (other.locked_)
           {
               if (!pointer_)
               {
                   pointer_ = std::make_shared<T>(*other.pointer_);
               }
               else
               {
                   *pointer_ = *other.pointer_;
               }
           }
           else
           {
               pointer_ = other.pointer_;
           }
   
           return *this;
       }
   
       ~external() = default;
   
       T& operator *() noexcept
       {
           return *pointer_;
       }
   
       const T& operator *() const noexcept
       {
           return *pointer_;
       }
   
       T* get() noexcept
       {
           return pointer_.get();
       }
   
       const T* get() const noexcept
       {
           return pointer_.get();
       }
   
       std::shared_ptr<T> get_shared_ptr() noexcept
       {
           return pointer_;
       }
   
       T* operator ->() noexcept
       {
           return pointer_.get();
       }
   
       const T* operator ->() const noexcept
       {
           return pointer_.get();
       }
   
       bool operator ==(
               const external<T>& other) const
       {
           return pointer_.get() == other.pointer_.get();
       }
   
       bool operator !=(
               const external<T>& other) const
       {
           return !(*this == other);
       }
   
       operator bool() const noexcept
       {
           return nullptr != pointer_.get();
       }
   
       bool is_locked() const noexcept
       {
           return locked_;
       }
   
       void lock() noexcept
       {
           locked_ = true;
       }
   
   private:
   
       std::shared_ptr<T> pointer_;
   
       bool locked_ {false};
   
   };
   
   } // namespace fastcdr
   } // namespace eprosima
   
   #endif //_FASTCDR_XCDR_EXTERNAL_HPP_