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//
// ip/basic_resolver_iterator.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2011 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 BOOST_ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
#define BOOST_ASIO_IP_BASIC_RESOLVER_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/iterator.hpp>
#include <cstring>
#include <string>
#include <vector>
#include <boost/asio/detail/shared_ptr.hpp>
#include <boost/asio/detail/socket_ops.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/ip/basic_resolver_entry.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace ip {
/// An iterator over the entries produced by a resolver.
/**
* The boost::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
#if defined(GENERATING_DOCUMENTATION)
: public std::iterator<
#else // defined(GENERATING_DOCUMENTATION)
: public boost::iterator<
#endif // defined(GENERATING_DOCUMENTATION)
std::forward_iterator_tag,
const basic_resolver_entry<InternetProtocol> >
{
public:
/// Default constructor creates an end iterator.
basic_resolver_iterator()
: index_(0)
{
}
/// Create an iterator from an addrinfo list returned by getaddrinfo.
static basic_resolver_iterator create(
boost::asio::detail::addrinfo_type* address_info,
const std::string& host_name, const std::string& service_name)
{
basic_resolver_iterator iter;
if (!address_info)
return iter;
std::string actual_host_name = host_name;
if (address_info->ai_canonname)
actual_host_name = address_info->ai_canonname;
iter.values_.reset(new values_type);
while (address_info)
{
if (address_info->ai_family == PF_INET
|| address_info->ai_family == PF_INET6)
{
using namespace std; // For memcpy.
typename InternetProtocol::endpoint endpoint;
endpoint.resize(static_cast<std::size_t>(address_info->ai_addrlen));
memcpy(endpoint.data(), address_info->ai_addr,
address_info->ai_addrlen);
iter.values_->push_back(
basic_resolver_entry<InternetProtocol>(endpoint,
actual_host_name, service_name));
}
address_info = address_info->ai_next;
}
return iter;
}
/// Create an iterator from an endpoint, host name and service name.
static basic_resolver_iterator create(
const typename InternetProtocol::endpoint& endpoint,
const std::string& host_name, const std::string& service_name)
{
basic_resolver_iterator iter;
iter.values_.reset(new values_type);
iter.values_->push_back(
basic_resolver_entry<InternetProtocol>(
endpoint, host_name, service_name));
return iter;
}
/// 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);
}
private:
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;
boost::asio::detail::shared_ptr<values_type> values_;
std::size_t index_;
};
} // namespace ip
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_IP_BASIC_RESOLVER_ITERATOR_HPP
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Swift