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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/ip/basic_resolver_iterator.hpp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
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-//
-// ip/basic_resolver_iterator.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff 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 ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
-#define ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include <cstring>
-#include <iterator>
-#include <string>
-#include <vector>
-#include "asio/detail/memory.hpp"
-#include "asio/detail/socket_ops.hpp"
-#include "asio/detail/socket_types.hpp"
-#include "asio/ip/basic_resolver_entry.hpp"
-
-#if defined(ASIO_WINDOWS_RUNTIME)
-# include "asio/detail/winrt_utils.hpp"
-#endif // defined(ASIO_WINDOWS_RUNTIME)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace ip {
-
-/// An iterator over the entries produced by a resolver.
-/**
- * The asio::ip::basic_resolver_iterator class template is used to define
- * iterators over the results returned by a resolver.
- *
- * The iterator's value_type, obtained when the iterator is dereferenced, is:
- * @code const basic_resolver_entry<InternetProtocol> @endcode
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-template <typename InternetProtocol>
-class basic_resolver_iterator
-{
-public:
- /// The type used for the distance between two iterators.
- typedef std::ptrdiff_t difference_type;
-
- /// The type of the value pointed to by the iterator.
- typedef basic_resolver_entry<InternetProtocol> value_type;
-
- /// The type of the result of applying operator->() to the iterator.
- typedef const basic_resolver_entry<InternetProtocol>* pointer;
-
- /// The type of the result of applying operator*() to the iterator.
- typedef const basic_resolver_entry<InternetProtocol>& reference;
-
- /// The iterator category.
- typedef std::forward_iterator_tag iterator_category;
-
- /// Default constructor creates an end iterator.
- basic_resolver_iterator()
- : index_(0)
- {
- }
-
- /// Copy constructor.
- basic_resolver_iterator(const basic_resolver_iterator& other)
- : values_(other.values_),
- index_(other.index_)
- {
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move constructor.
- basic_resolver_iterator(basic_resolver_iterator&& other)
- : values_(ASIO_MOVE_CAST(values_ptr_type)(other.values_)),
- index_(other.index_)
- {
- other.index_ = 0;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Assignment operator.
- basic_resolver_iterator& operator=(const basic_resolver_iterator& other)
- {
- values_ = other.values_;
- index_ = other.index_;
- return *this;
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move-assignment operator.
- basic_resolver_iterator& operator=(basic_resolver_iterator&& other)
- {
- if (this != &other)
- {
- values_ = ASIO_MOVE_CAST(values_ptr_type)(other.values_);
- index_ = other.index_;
- other.index_ = 0;
- }
-
- return *this;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Dereference an iterator.
- const basic_resolver_entry<InternetProtocol>& operator*() const
- {
- return dereference();
- }
-
- /// Dereference an iterator.
- const basic_resolver_entry<InternetProtocol>* operator->() const
- {
- return &dereference();
- }
-
- /// Increment operator (prefix).
- basic_resolver_iterator& operator++()
- {
- increment();
- return *this;
- }
-
- /// Increment operator (postfix).
- basic_resolver_iterator operator++(int)
- {
- basic_resolver_iterator tmp(*this);
- ++*this;
- return tmp;
- }
-
- /// Test two iterators for equality.
- friend bool operator==(const basic_resolver_iterator& a,
- const basic_resolver_iterator& b)
- {
- return a.equal(b);
- }
-
- /// Test two iterators for inequality.
- friend bool operator!=(const basic_resolver_iterator& a,
- const basic_resolver_iterator& b)
- {
- return !a.equal(b);
- }
-
-protected:
- void increment()
- {
- if (++index_ == values_->size())
- {
- // Reset state to match a default constructed end iterator.
- values_.reset();
- index_ = 0;
- }
- }
-
- bool equal(const basic_resolver_iterator& other) const
- {
- if (!values_ && !other.values_)
- return true;
- if (values_ != other.values_)
- return false;
- return index_ == other.index_;
- }
-
- const basic_resolver_entry<InternetProtocol>& dereference() const
- {
- return (*values_)[index_];
- }
-
- typedef std::vector<basic_resolver_entry<InternetProtocol> > values_type;
- typedef asio::detail::shared_ptr<values_type> values_ptr_type;
- values_ptr_type values_;
- std::size_t index_;
-};
-
-} // namespace ip
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP