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 //
 // ip/address_v6_iterator.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //                         Oliver Kowalke (oliver dot kowalke at gmail dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 
 #ifndef BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP
 #define BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 #include <boost/asio/ip/address_v6.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace ip {
 
 template <typename> class basic_address_iterator;
 
 /// An input iterator that can be used for traversing IPv6 addresses.
 /**
  * In addition to satisfying the input iterator requirements, this iterator
  * also supports decrement.
  *
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
 template <> class basic_address_iterator<address_v6>
 {
 public:
   /// The type of the elements pointed to by the iterator.
   typedef address_v6 value_type;
 
   /// Distance between two iterators.
   typedef std::ptrdiff_t difference_type;
 
   /// The type of a pointer to an element pointed to by the iterator.
   typedef const address_v6* pointer;
 
   /// The type of a reference to an element pointed to by the iterator.
   typedef const address_v6& reference;
 
   /// Denotes that the iterator satisfies the input iterator requirements.
   typedef std::input_iterator_tag iterator_category;
 
   /// Construct an iterator that points to the specified address.
   basic_address_iterator(const address_v6& addr) noexcept
     : address_(addr)
   {
   }
 
   /// Copy constructor.
   basic_address_iterator(
       const basic_address_iterator& other) noexcept
     : address_(other.address_)
   {
   }
 
   /// Move constructor.
   basic_address_iterator(basic_address_iterator&& other) noexcept
     : address_(static_cast<address_v6&&>(other.address_))
   {
   }
 
   /// Assignment operator.
   basic_address_iterator& operator=(
       const basic_address_iterator& other) noexcept
   {
     address_ = other.address_;
     return *this;
   }
 
   /// Move assignment operator.
   basic_address_iterator& operator=(basic_address_iterator&& other) noexcept
   {
     address_ = static_cast<address_v6&&>(other.address_);
     return *this;
   }
 
   /// Dereference the iterator.
   const address_v6& operator*() const noexcept
   {
     return address_;
   }
 
   /// Dereference the iterator.
   const address_v6* operator->() const noexcept
   {
     return &address_;
   }
 
   /// Pre-increment operator.
   basic_address_iterator& operator++() noexcept
   {
     for (int i = 15; i >= 0; --i)
     {
       if (address_.addr_.s6_addr[i] < 0xFF)
       {
         ++address_.addr_.s6_addr[i];
         break;
       }
 
       address_.addr_.s6_addr[i] = 0;
     }
 
     return *this;
   }
 
   /// Post-increment operator.
   basic_address_iterator operator++(int) noexcept
   {
     basic_address_iterator tmp(*this);
     ++*this;
     return tmp;
   }
 
   /// Pre-decrement operator.
   basic_address_iterator& operator--() noexcept
   {
     for (int i = 15; i >= 0; --i)
     {
       if (address_.addr_.s6_addr[i] > 0)
       {
         --address_.addr_.s6_addr[i];
         break;
       }
 
       address_.addr_.s6_addr[i] = 0xFF;
     }
 
     return *this;
   }
 
   /// Post-decrement operator.
   basic_address_iterator operator--(int)
   {
     basic_address_iterator tmp(*this);
     --*this;
     return tmp;
   }
 
   /// Compare two addresses for equality.
   friend bool operator==(const basic_address_iterator& a,
       const basic_address_iterator& b)
   {
     return a.address_ == b.address_;
   }
 
   /// Compare two addresses for inequality.
   friend bool operator!=(const basic_address_iterator& a,
       const basic_address_iterator& b)
   {
     return a.address_ != b.address_;
   }
 
 private:
   address_v6 address_;
 };
 
 /// An input iterator that can be used for traversing IPv6 addresses.
 typedef basic_address_iterator<address_v6> address_v6_iterator;
 
 } // namespace ip
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // BOOST_ASIO_IP_ADDRESS_V6_ITERATOR_HPP

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